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Silence -Wunused-variable in release builds.
[llvm/stm8.git] / lib / Target / ARM / ARMISelLowering.cpp
blob4340a714778a226f742002c9d95eaa8ccb7bb114
1 //===-- ARMISelLowering.cpp - ARM DAG Lowering Implementation -------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the interfaces that ARM uses to lower LLVM code into a
11 // selection DAG.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #define DEBUG_TYPE "arm-isel"
16 #include "ARM.h"
17 #include "ARMAddressingModes.h"
18 #include "ARMCallingConv.h"
19 #include "ARMConstantPoolValue.h"
20 #include "ARMISelLowering.h"
21 #include "ARMMachineFunctionInfo.h"
22 #include "ARMPerfectShuffle.h"
23 #include "ARMRegisterInfo.h"
24 #include "ARMSubtarget.h"
25 #include "ARMTargetMachine.h"
26 #include "ARMTargetObjectFile.h"
27 #include "llvm/CallingConv.h"
28 #include "llvm/Constants.h"
29 #include "llvm/Function.h"
30 #include "llvm/GlobalValue.h"
31 #include "llvm/Instruction.h"
32 #include "llvm/Instructions.h"
33 #include "llvm/Intrinsics.h"
34 #include "llvm/Type.h"
35 #include "llvm/CodeGen/CallingConvLower.h"
36 #include "llvm/CodeGen/IntrinsicLowering.h"
37 #include "llvm/CodeGen/MachineBasicBlock.h"
38 #include "llvm/CodeGen/MachineFrameInfo.h"
39 #include "llvm/CodeGen/MachineFunction.h"
40 #include "llvm/CodeGen/MachineInstrBuilder.h"
41 #include "llvm/CodeGen/MachineRegisterInfo.h"
42 #include "llvm/CodeGen/PseudoSourceValue.h"
43 #include "llvm/CodeGen/SelectionDAG.h"
44 #include "llvm/MC/MCSectionMachO.h"
45 #include "llvm/Target/TargetOptions.h"
46 #include "llvm/ADT/VectorExtras.h"
47 #include "llvm/ADT/StringExtras.h"
48 #include "llvm/ADT/Statistic.h"
49 #include "llvm/Support/CommandLine.h"
50 #include "llvm/Support/ErrorHandling.h"
51 #include "llvm/Support/MathExtras.h"
52 #include "llvm/Support/raw_ostream.h"
53 #include <sstream>
54 using namespace llvm;
55
56 STATISTIC(NumTailCalls, "Number of tail calls");
57 STATISTIC(NumMovwMovt, "Number of GAs materialized with movw + movt");
58
59 // This option should go away when tail calls fully work.
60 static cl::opt<bool>
61 EnableARMTailCalls("arm-tail-calls", cl::Hidden,
62 cl::desc("Generate tail calls (TEMPORARY OPTION)."),
63 cl::init(false));
64
65 cl::opt<bool>
66 EnableARMLongCalls("arm-long-calls", cl::Hidden,
67 cl::desc("Generate calls via indirect call instructions"),
68 cl::init(false));
69
70 static cl::opt<bool>
71 ARMInterworking("arm-interworking", cl::Hidden,
72 cl::desc("Enable / disable ARM interworking (for debugging only)"),
73 cl::init(true));
74
75 namespace llvm {
76 class ARMCCState : public CCState {
77 public:
78 ARMCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
79 const TargetMachine &TM, SmallVector<CCValAssign, 16> &locs,
80 LLVMContext &C, ParmContext PC)
81 : CCState(CC, isVarArg, MF, TM, locs, C) {
82 assert(((PC == Call) || (PC == Prologue)) &&
83 "ARMCCState users must specify whether their context is call"
84 "or prologue generation.");
85 CallOrPrologue = PC;
86 }
87 };
88 }
89
90 // The APCS parameter registers.
91 static const unsigned GPRArgRegs[] = {
92 ARM::R0, ARM::R1, ARM::R2, ARM::R3
93 };
94
95 void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT,
96 EVT PromotedBitwiseVT) {
97 if (VT != PromotedLdStVT) {
98 setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
99 AddPromotedToType (ISD::LOAD, VT.getSimpleVT(),
100 PromotedLdStVT.getSimpleVT());
101
102 setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
103 AddPromotedToType (ISD::STORE, VT.getSimpleVT(),
104 PromotedLdStVT.getSimpleVT());
105 }
106
107 EVT ElemTy = VT.getVectorElementType();
108 if (ElemTy != MVT::i64 && ElemTy != MVT::f64)
109 setOperationAction(ISD::VSETCC, VT.getSimpleVT(), Custom);
110 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom);
111 if (ElemTy != MVT::i32) {
112 setOperationAction(ISD::SINT_TO_FP, VT.getSimpleVT(), Expand);
113 setOperationAction(ISD::UINT_TO_FP, VT.getSimpleVT(), Expand);
114 setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Expand);
115 setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Expand);
116 }
117 setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom);
118 setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom);
119 setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Legal);
120 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Legal);
121 setOperationAction(ISD::SELECT, VT.getSimpleVT(), Expand);
122 setOperationAction(ISD::SELECT_CC, VT.getSimpleVT(), Expand);
123 if (VT.isInteger()) {
124 setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom);
125 setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom);
126 setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
127 setLoadExtAction(ISD::SEXTLOAD, VT.getSimpleVT(), Expand);
128 setLoadExtAction(ISD::ZEXTLOAD, VT.getSimpleVT(), Expand);
129 for (unsigned InnerVT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
130 InnerVT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++InnerVT)
131 setTruncStoreAction(VT.getSimpleVT(),
132 (MVT::SimpleValueType)InnerVT, Expand);
133 }
134 setLoadExtAction(ISD::EXTLOAD, VT.getSimpleVT(), Expand);
135
136 // Promote all bit-wise operations.
137 if (VT.isInteger() && VT != PromotedBitwiseVT) {
138 setOperationAction(ISD::AND, VT.getSimpleVT(), Promote);
139 AddPromotedToType (ISD::AND, VT.getSimpleVT(),
140 PromotedBitwiseVT.getSimpleVT());
141 setOperationAction(ISD::OR, VT.getSimpleVT(), Promote);
142 AddPromotedToType (ISD::OR, VT.getSimpleVT(),
143 PromotedBitwiseVT.getSimpleVT());
144 setOperationAction(ISD::XOR, VT.getSimpleVT(), Promote);
145 AddPromotedToType (ISD::XOR, VT.getSimpleVT(),
146 PromotedBitwiseVT.getSimpleVT());
147 }
148
149 // Neon does not support vector divide/remainder operations.
150 setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand);
151 setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand);
152 setOperationAction(ISD::FDIV, VT.getSimpleVT(), Expand);
153 setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand);
154 setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand);
155 setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand);
156 }
157
158 void ARMTargetLowering::addDRTypeForNEON(EVT VT) {
159 addRegisterClass(VT, ARM::DPRRegisterClass);
160 addTypeForNEON(VT, MVT::f64, MVT::v2i32);
161 }
162
163 void ARMTargetLowering::addQRTypeForNEON(EVT VT) {
164 addRegisterClass(VT, ARM::QPRRegisterClass);
165 addTypeForNEON(VT, MVT::v2f64, MVT::v4i32);
166 }
167
168 static TargetLoweringObjectFile *createTLOF(TargetMachine &TM) {
169 if (TM.getSubtarget<ARMSubtarget>().isTargetDarwin())
170 return new TargetLoweringObjectFileMachO();
171
172 return new ARMElfTargetObjectFile();
173 }
174
175 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
176 : TargetLowering(TM, createTLOF(TM)) {
177 Subtarget = &TM.getSubtarget<ARMSubtarget>();
178 RegInfo = TM.getRegisterInfo();
179 Itins = TM.getInstrItineraryData();
180
181 if (Subtarget->isTargetDarwin()) {
182 // Uses VFP for Thumb libfuncs if available.
183 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
184 // Single-precision floating-point arithmetic.
185 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
186 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
187 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
188 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
189
190 // Double-precision floating-point arithmetic.
191 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
192 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
193 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
194 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
195
196 // Single-precision comparisons.
197 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
198 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
199 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
200 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
201 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
202 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
203 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
204 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
205
206 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
207 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
208 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
209 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
210 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
211 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
212 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
213 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
214
215 // Double-precision comparisons.
216 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
217 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
218 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
219 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
220 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
221 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
222 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
223 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
224
225 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
226 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
227 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
228 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
229 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
230 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
231 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
232 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
233
234 // Floating-point to integer conversions.
235 // i64 conversions are done via library routines even when generating VFP
236 // instructions, so use the same ones.
237 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
238 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
239 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
240 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
241
242 // Conversions between floating types.
243 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
244 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
245
246 // Integer to floating-point conversions.
247 // i64 conversions are done via library routines even when generating VFP
248 // instructions, so use the same ones.
249 // FIXME: There appears to be some naming inconsistency in ARM libgcc:
250 // e.g., __floatunsidf vs. __floatunssidfvfp.
251 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
252 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
253 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
254 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
255 }
256 }
257
258 // These libcalls are not available in 32-bit.
259 setLibcallName(RTLIB::SHL_I128, 0);
260 setLibcallName(RTLIB::SRL_I128, 0);
261 setLibcallName(RTLIB::SRA_I128, 0);
262
263 if (Subtarget->isAAPCS_ABI()) {
264 // Double-precision floating-point arithmetic helper functions
265 // RTABI chapter 4.1.2, Table 2
266 setLibcallName(RTLIB::ADD_F64, "__aeabi_dadd");
267 setLibcallName(RTLIB::DIV_F64, "__aeabi_ddiv");
268 setLibcallName(RTLIB::MUL_F64, "__aeabi_dmul");
269 setLibcallName(RTLIB::SUB_F64, "__aeabi_dsub");
270 setLibcallCallingConv(RTLIB::ADD_F64, CallingConv::ARM_AAPCS);
271 setLibcallCallingConv(RTLIB::DIV_F64, CallingConv::ARM_AAPCS);
272 setLibcallCallingConv(RTLIB::MUL_F64, CallingConv::ARM_AAPCS);
273 setLibcallCallingConv(RTLIB::SUB_F64, CallingConv::ARM_AAPCS);
274
275 // Double-precision floating-point comparison helper functions
276 // RTABI chapter 4.1.2, Table 3
277 setLibcallName(RTLIB::OEQ_F64, "__aeabi_dcmpeq");
278 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
279 setLibcallName(RTLIB::UNE_F64, "__aeabi_dcmpeq");
280 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETEQ);
281 setLibcallName(RTLIB::OLT_F64, "__aeabi_dcmplt");
282 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
283 setLibcallName(RTLIB::OLE_F64, "__aeabi_dcmple");
284 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
285 setLibcallName(RTLIB::OGE_F64, "__aeabi_dcmpge");
286 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
287 setLibcallName(RTLIB::OGT_F64, "__aeabi_dcmpgt");
288 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
289 setLibcallName(RTLIB::UO_F64, "__aeabi_dcmpun");
290 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
291 setLibcallName(RTLIB::O_F64, "__aeabi_dcmpun");
292 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
293 setLibcallCallingConv(RTLIB::OEQ_F64, CallingConv::ARM_AAPCS);
294 setLibcallCallingConv(RTLIB::UNE_F64, CallingConv::ARM_AAPCS);
295 setLibcallCallingConv(RTLIB::OLT_F64, CallingConv::ARM_AAPCS);
296 setLibcallCallingConv(RTLIB::OLE_F64, CallingConv::ARM_AAPCS);
297 setLibcallCallingConv(RTLIB::OGE_F64, CallingConv::ARM_AAPCS);
298 setLibcallCallingConv(RTLIB::OGT_F64, CallingConv::ARM_AAPCS);
299 setLibcallCallingConv(RTLIB::UO_F64, CallingConv::ARM_AAPCS);
300 setLibcallCallingConv(RTLIB::O_F64, CallingConv::ARM_AAPCS);
301
302 // Single-precision floating-point arithmetic helper functions
303 // RTABI chapter 4.1.2, Table 4
304 setLibcallName(RTLIB::ADD_F32, "__aeabi_fadd");
305 setLibcallName(RTLIB::DIV_F32, "__aeabi_fdiv");
306 setLibcallName(RTLIB::MUL_F32, "__aeabi_fmul");
307 setLibcallName(RTLIB::SUB_F32, "__aeabi_fsub");
308 setLibcallCallingConv(RTLIB::ADD_F32, CallingConv::ARM_AAPCS);
309 setLibcallCallingConv(RTLIB::DIV_F32, CallingConv::ARM_AAPCS);
310 setLibcallCallingConv(RTLIB::MUL_F32, CallingConv::ARM_AAPCS);
311 setLibcallCallingConv(RTLIB::SUB_F32, CallingConv::ARM_AAPCS);
312
313 // Single-precision floating-point comparison helper functions
314 // RTABI chapter 4.1.2, Table 5
315 setLibcallName(RTLIB::OEQ_F32, "__aeabi_fcmpeq");
316 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
317 setLibcallName(RTLIB::UNE_F32, "__aeabi_fcmpeq");
318 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETEQ);
319 setLibcallName(RTLIB::OLT_F32, "__aeabi_fcmplt");
320 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
321 setLibcallName(RTLIB::OLE_F32, "__aeabi_fcmple");
322 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
323 setLibcallName(RTLIB::OGE_F32, "__aeabi_fcmpge");
324 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
325 setLibcallName(RTLIB::OGT_F32, "__aeabi_fcmpgt");
326 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
327 setLibcallName(RTLIB::UO_F32, "__aeabi_fcmpun");
328 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
329 setLibcallName(RTLIB::O_F32, "__aeabi_fcmpun");
330 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
331 setLibcallCallingConv(RTLIB::OEQ_F32, CallingConv::ARM_AAPCS);
332 setLibcallCallingConv(RTLIB::UNE_F32, CallingConv::ARM_AAPCS);
333 setLibcallCallingConv(RTLIB::OLT_F32, CallingConv::ARM_AAPCS);
334 setLibcallCallingConv(RTLIB::OLE_F32, CallingConv::ARM_AAPCS);
335 setLibcallCallingConv(RTLIB::OGE_F32, CallingConv::ARM_AAPCS);
336 setLibcallCallingConv(RTLIB::OGT_F32, CallingConv::ARM_AAPCS);
337 setLibcallCallingConv(RTLIB::UO_F32, CallingConv::ARM_AAPCS);
338 setLibcallCallingConv(RTLIB::O_F32, CallingConv::ARM_AAPCS);
339
340 // Floating-point to integer conversions.
341 // RTABI chapter 4.1.2, Table 6
342 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__aeabi_d2iz");
343 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__aeabi_d2uiz");
344 setLibcallName(RTLIB::FPTOSINT_F64_I64, "__aeabi_d2lz");
345 setLibcallName(RTLIB::FPTOUINT_F64_I64, "__aeabi_d2ulz");
346 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__aeabi_f2iz");
347 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__aeabi_f2uiz");
348 setLibcallName(RTLIB::FPTOSINT_F32_I64, "__aeabi_f2lz");
349 setLibcallName(RTLIB::FPTOUINT_F32_I64, "__aeabi_f2ulz");
350 setLibcallCallingConv(RTLIB::FPTOSINT_F64_I32, CallingConv::ARM_AAPCS);
351 setLibcallCallingConv(RTLIB::FPTOUINT_F64_I32, CallingConv::ARM_AAPCS);
352 setLibcallCallingConv(RTLIB::FPTOSINT_F64_I64, CallingConv::ARM_AAPCS);
353 setLibcallCallingConv(RTLIB::FPTOUINT_F64_I64, CallingConv::ARM_AAPCS);
354 setLibcallCallingConv(RTLIB::FPTOSINT_F32_I32, CallingConv::ARM_AAPCS);
355 setLibcallCallingConv(RTLIB::FPTOUINT_F32_I32, CallingConv::ARM_AAPCS);
356 setLibcallCallingConv(RTLIB::FPTOSINT_F32_I64, CallingConv::ARM_AAPCS);
357 setLibcallCallingConv(RTLIB::FPTOUINT_F32_I64, CallingConv::ARM_AAPCS);
358
359 // Conversions between floating types.
360 // RTABI chapter 4.1.2, Table 7
361 setLibcallName(RTLIB::FPROUND_F64_F32, "__aeabi_d2f");
362 setLibcallName(RTLIB::FPEXT_F32_F64, "__aeabi_f2d");
363 setLibcallCallingConv(RTLIB::FPROUND_F64_F32, CallingConv::ARM_AAPCS);
364 setLibcallCallingConv(RTLIB::FPEXT_F32_F64, CallingConv::ARM_AAPCS);
365
366 // Integer to floating-point conversions.
367 // RTABI chapter 4.1.2, Table 8
368 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__aeabi_i2d");
369 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__aeabi_ui2d");
370 setLibcallName(RTLIB::SINTTOFP_I64_F64, "__aeabi_l2d");
371 setLibcallName(RTLIB::UINTTOFP_I64_F64, "__aeabi_ul2d");
372 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__aeabi_i2f");
373 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__aeabi_ui2f");
374 setLibcallName(RTLIB::SINTTOFP_I64_F32, "__aeabi_l2f");
375 setLibcallName(RTLIB::UINTTOFP_I64_F32, "__aeabi_ul2f");
376 setLibcallCallingConv(RTLIB::SINTTOFP_I32_F64, CallingConv::ARM_AAPCS);
377 setLibcallCallingConv(RTLIB::UINTTOFP_I32_F64, CallingConv::ARM_AAPCS);
378 setLibcallCallingConv(RTLIB::SINTTOFP_I64_F64, CallingConv::ARM_AAPCS);
379 setLibcallCallingConv(RTLIB::UINTTOFP_I64_F64, CallingConv::ARM_AAPCS);
380 setLibcallCallingConv(RTLIB::SINTTOFP_I32_F32, CallingConv::ARM_AAPCS);
381 setLibcallCallingConv(RTLIB::UINTTOFP_I32_F32, CallingConv::ARM_AAPCS);
382 setLibcallCallingConv(RTLIB::SINTTOFP_I64_F32, CallingConv::ARM_AAPCS);
383 setLibcallCallingConv(RTLIB::UINTTOFP_I64_F32, CallingConv::ARM_AAPCS);
384
385 // Long long helper functions
386 // RTABI chapter 4.2, Table 9
387 setLibcallName(RTLIB::MUL_I64, "__aeabi_lmul");
388 setLibcallName(RTLIB::SDIV_I64, "__aeabi_ldivmod");
389 setLibcallName(RTLIB::UDIV_I64, "__aeabi_uldivmod");
390 setLibcallName(RTLIB::SHL_I64, "__aeabi_llsl");
391 setLibcallName(RTLIB::SRL_I64, "__aeabi_llsr");
392 setLibcallName(RTLIB::SRA_I64, "__aeabi_lasr");
393 setLibcallCallingConv(RTLIB::MUL_I64, CallingConv::ARM_AAPCS);
394 setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::ARM_AAPCS);
395 setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::ARM_AAPCS);
396 setLibcallCallingConv(RTLIB::SHL_I64, CallingConv::ARM_AAPCS);
397 setLibcallCallingConv(RTLIB::SRL_I64, CallingConv::ARM_AAPCS);
398 setLibcallCallingConv(RTLIB::SRA_I64, CallingConv::ARM_AAPCS);
399
400 // Integer division functions
401 // RTABI chapter 4.3.1
402 setLibcallName(RTLIB::SDIV_I8, "__aeabi_idiv");
403 setLibcallName(RTLIB::SDIV_I16, "__aeabi_idiv");
404 setLibcallName(RTLIB::SDIV_I32, "__aeabi_idiv");
405 setLibcallName(RTLIB::UDIV_I8, "__aeabi_uidiv");
406 setLibcallName(RTLIB::UDIV_I16, "__aeabi_uidiv");
407 setLibcallName(RTLIB::UDIV_I32, "__aeabi_uidiv");
408 setLibcallCallingConv(RTLIB::SDIV_I8, CallingConv::ARM_AAPCS);
409 setLibcallCallingConv(RTLIB::SDIV_I16, CallingConv::ARM_AAPCS);
410 setLibcallCallingConv(RTLIB::SDIV_I32, CallingConv::ARM_AAPCS);
411 setLibcallCallingConv(RTLIB::UDIV_I8, CallingConv::ARM_AAPCS);
412 setLibcallCallingConv(RTLIB::UDIV_I16, CallingConv::ARM_AAPCS);
413 setLibcallCallingConv(RTLIB::UDIV_I32, CallingConv::ARM_AAPCS);
414
415 // Memory operations
416 // RTABI chapter 4.3.4
417 setLibcallName(RTLIB::MEMCPY, "__aeabi_memcpy");
418 setLibcallName(RTLIB::MEMMOVE, "__aeabi_memmove");
419 setLibcallName(RTLIB::MEMSET, "__aeabi_memset");
420 }
421
422 if (Subtarget->isThumb1Only())
423 addRegisterClass(MVT::i32, ARM::tGPRRegisterClass);
424 else
425 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
426 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
427 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
428 if (!Subtarget->isFPOnlySP())
429 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
430
431 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
432 }
433
434 if (Subtarget->hasNEON()) {
435 addDRTypeForNEON(MVT::v2f32);
436 addDRTypeForNEON(MVT::v8i8);
437 addDRTypeForNEON(MVT::v4i16);
438 addDRTypeForNEON(MVT::v2i32);
439 addDRTypeForNEON(MVT::v1i64);
440
441 addQRTypeForNEON(MVT::v4f32);
442 addQRTypeForNEON(MVT::v2f64);
443 addQRTypeForNEON(MVT::v16i8);
444 addQRTypeForNEON(MVT::v8i16);
445 addQRTypeForNEON(MVT::v4i32);
446 addQRTypeForNEON(MVT::v2i64);
447
448 // v2f64 is legal so that QR subregs can be extracted as f64 elements, but
449 // neither Neon nor VFP support any arithmetic operations on it.
450 setOperationAction(ISD::FADD, MVT::v2f64, Expand);
451 setOperationAction(ISD::FSUB, MVT::v2f64, Expand);
452 setOperationAction(ISD::FMUL, MVT::v2f64, Expand);
453 setOperationAction(ISD::FDIV, MVT::v2f64, Expand);
454 setOperationAction(ISD::FREM, MVT::v2f64, Expand);
455 setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Expand);
456 setOperationAction(ISD::VSETCC, MVT::v2f64, Expand);
457 setOperationAction(ISD::FNEG, MVT::v2f64, Expand);
458 setOperationAction(ISD::FABS, MVT::v2f64, Expand);
459 setOperationAction(ISD::FSQRT, MVT::v2f64, Expand);
460 setOperationAction(ISD::FSIN, MVT::v2f64, Expand);
461 setOperationAction(ISD::FCOS, MVT::v2f64, Expand);
462 setOperationAction(ISD::FPOWI, MVT::v2f64, Expand);
463 setOperationAction(ISD::FPOW, MVT::v2f64, Expand);
464 setOperationAction(ISD::FLOG, MVT::v2f64, Expand);
465 setOperationAction(ISD::FLOG2, MVT::v2f64, Expand);
466 setOperationAction(ISD::FLOG10, MVT::v2f64, Expand);
467 setOperationAction(ISD::FEXP, MVT::v2f64, Expand);
468 setOperationAction(ISD::FEXP2, MVT::v2f64, Expand);
469 setOperationAction(ISD::FCEIL, MVT::v2f64, Expand);
470 setOperationAction(ISD::FTRUNC, MVT::v2f64, Expand);
471 setOperationAction(ISD::FRINT, MVT::v2f64, Expand);
472 setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Expand);
473 setOperationAction(ISD::FFLOOR, MVT::v2f64, Expand);
474
475 setTruncStoreAction(MVT::v2f64, MVT::v2f32, Expand);
476
477 // Neon does not support some operations on v1i64 and v2i64 types.
478 setOperationAction(ISD::MUL, MVT::v1i64, Expand);
479 // Custom handling for some quad-vector types to detect VMULL.
480 setOperationAction(ISD::MUL, MVT::v8i16, Custom);
481 setOperationAction(ISD::MUL, MVT::v4i32, Custom);
482 setOperationAction(ISD::MUL, MVT::v2i64, Custom);
483 // Custom handling for some vector types to avoid expensive expansions
484 setOperationAction(ISD::SDIV, MVT::v4i16, Custom);
485 setOperationAction(ISD::SDIV, MVT::v8i8, Custom);
486 setOperationAction(ISD::UDIV, MVT::v4i16, Custom);
487 setOperationAction(ISD::UDIV, MVT::v8i8, Custom);
488 setOperationAction(ISD::VSETCC, MVT::v1i64, Expand);
489 setOperationAction(ISD::VSETCC, MVT::v2i64, Expand);
490 // Neon does not have single instruction SINT_TO_FP and UINT_TO_FP with
491 // a destination type that is wider than the source.
492 setOperationAction(ISD::SINT_TO_FP, MVT::v4i16, Custom);
493 setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Custom);
494
495 setTargetDAGCombine(ISD::INTRINSIC_VOID);
496 setTargetDAGCombine(ISD::INTRINSIC_W_CHAIN);
497 setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
498 setTargetDAGCombine(ISD::SHL);
499 setTargetDAGCombine(ISD::SRL);
500 setTargetDAGCombine(ISD::SRA);
501 setTargetDAGCombine(ISD::SIGN_EXTEND);
502 setTargetDAGCombine(ISD::ZERO_EXTEND);
503 setTargetDAGCombine(ISD::ANY_EXTEND);
504 setTargetDAGCombine(ISD::SELECT_CC);
505 setTargetDAGCombine(ISD::BUILD_VECTOR);
506 setTargetDAGCombine(ISD::VECTOR_SHUFFLE);
507 setTargetDAGCombine(ISD::INSERT_VECTOR_ELT);
508 setTargetDAGCombine(ISD::STORE);
509 setTargetDAGCombine(ISD::FP_TO_SINT);
510 setTargetDAGCombine(ISD::FP_TO_UINT);
511 setTargetDAGCombine(ISD::FDIV);
512 }
513
514 computeRegisterProperties();
515
516 // ARM does not have f32 extending load.
517 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
518
519 // ARM does not have i1 sign extending load.
520 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
521
522 // ARM supports all 4 flavors of integer indexed load / store.
523 if (!Subtarget->isThumb1Only()) {
524 for (unsigned im = (unsigned)ISD::PRE_INC;
525 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
526 setIndexedLoadAction(im, MVT::i1, Legal);
527 setIndexedLoadAction(im, MVT::i8, Legal);
528 setIndexedLoadAction(im, MVT::i16, Legal);
529 setIndexedLoadAction(im, MVT::i32, Legal);
530 setIndexedStoreAction(im, MVT::i1, Legal);
531 setIndexedStoreAction(im, MVT::i8, Legal);
532 setIndexedStoreAction(im, MVT::i16, Legal);
533 setIndexedStoreAction(im, MVT::i32, Legal);
534 }
535 }
536
537 // i64 operation support.
538 setOperationAction(ISD::MUL, MVT::i64, Expand);
539 setOperationAction(ISD::MULHU, MVT::i32, Expand);
540 if (Subtarget->isThumb1Only()) {
541 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
542 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
543 }
544 if (Subtarget->isThumb1Only() || !Subtarget->hasV6Ops()
545 || (Subtarget->isThumb2() && !Subtarget->hasThumb2DSP()))
546 setOperationAction(ISD::MULHS, MVT::i32, Expand);
547
548 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
549 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
550 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
551 setOperationAction(ISD::SRL, MVT::i64, Custom);
552 setOperationAction(ISD::SRA, MVT::i64, Custom);
553
554 // ARM does not have ROTL.
555 setOperationAction(ISD::ROTL, MVT::i32, Expand);
556 setOperationAction(ISD::CTTZ, MVT::i32, Custom);
557 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
558 if (!Subtarget->hasV5TOps() || Subtarget->isThumb1Only())
559 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
560
561 // Only ARMv6 has BSWAP.
562 if (!Subtarget->hasV6Ops())
563 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
564
565 // These are expanded into libcalls.
566 if (!Subtarget->hasDivide() || !Subtarget->isThumb2()) {
567 // v7M has a hardware divider
568 setOperationAction(ISD::SDIV, MVT::i32, Expand);
569 setOperationAction(ISD::UDIV, MVT::i32, Expand);
570 }
571 setOperationAction(ISD::SREM, MVT::i32, Expand);
572 setOperationAction(ISD::UREM, MVT::i32, Expand);
573 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
574 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
575
576 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
577 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
578 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
579 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
580 setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
581
582 setOperationAction(ISD::TRAP, MVT::Other, Legal);
583
584 // Use the default implementation.
585 setOperationAction(ISD::VASTART, MVT::Other, Custom);
586 setOperationAction(ISD::VAARG, MVT::Other, Expand);
587 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
588 setOperationAction(ISD::VAEND, MVT::Other, Expand);
589 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
590 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
591 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
592 setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
593 setExceptionPointerRegister(ARM::R0);
594 setExceptionSelectorRegister(ARM::R1);
595
596 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
597 // ARMv6 Thumb1 (except for CPUs that support dmb / dsb) and earlier use
598 // the default expansion.
599 if (Subtarget->hasDataBarrier() ||
600 (Subtarget->hasV6Ops() && !Subtarget->isThumb())) {
601 // membarrier needs custom lowering; the rest are legal and handled
602 // normally.
603 setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom);
604 } else {
605 // Set them all for expansion, which will force libcalls.
606 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
607 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i8, Expand);
608 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i16, Expand);
609 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Expand);
610 setOperationAction(ISD::ATOMIC_SWAP, MVT::i8, Expand);
611 setOperationAction(ISD::ATOMIC_SWAP, MVT::i16, Expand);
612 setOperationAction(ISD::ATOMIC_SWAP, MVT::i32, Expand);
613 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i8, Expand);
614 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i16, Expand);
615 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i32, Expand);
616 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i8, Expand);
617 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i16, Expand);
618 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i32, Expand);
619 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i8, Expand);
620 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i16, Expand);
621 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i32, Expand);
622 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i8, Expand);
623 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i16, Expand);
624 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i32, Expand);
625 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i8, Expand);
626 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i16, Expand);
627 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i32, Expand);
628 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i8, Expand);
629 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i16, Expand);
630 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand);
631 setOperationAction(ISD::ATOMIC_LOAD_MIN, MVT::i8, Expand);
632 setOperationAction(ISD::ATOMIC_LOAD_MIN, MVT::i16, Expand);
633 setOperationAction(ISD::ATOMIC_LOAD_MIN, MVT::i32, Expand);
634 setOperationAction(ISD::ATOMIC_LOAD_MAX, MVT::i8, Expand);
635 setOperationAction(ISD::ATOMIC_LOAD_MAX, MVT::i16, Expand);
636 setOperationAction(ISD::ATOMIC_LOAD_MAX, MVT::i32, Expand);
637 setOperationAction(ISD::ATOMIC_LOAD_UMIN, MVT::i8, Expand);
638 setOperationAction(ISD::ATOMIC_LOAD_UMIN, MVT::i16, Expand);
639 setOperationAction(ISD::ATOMIC_LOAD_UMIN, MVT::i32, Expand);
640 setOperationAction(ISD::ATOMIC_LOAD_UMAX, MVT::i8, Expand);
641 setOperationAction(ISD::ATOMIC_LOAD_UMAX, MVT::i16, Expand);
642 setOperationAction(ISD::ATOMIC_LOAD_UMAX, MVT::i32, Expand);
643 // Since the libcalls include locking, fold in the fences
644 setShouldFoldAtomicFences(true);
645 }
646 // 64-bit versions are always libcalls (for now)
647 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i64, Expand);
648 setOperationAction(ISD::ATOMIC_SWAP, MVT::i64, Expand);
649 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i64, Expand);
650 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i64, Expand);
651 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i64, Expand);
652 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i64, Expand);
653 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i64, Expand);
654 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i64, Expand);
655
656 setOperationAction(ISD::PREFETCH, MVT::Other, Custom);
657
658 // Requires SXTB/SXTH, available on v6 and up in both ARM and Thumb modes.
659 if (!Subtarget->hasV6Ops()) {
660 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
661 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
662 }
663 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
664
665 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
666 // Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR
667 // iff target supports vfp2.
668 setOperationAction(ISD::BITCAST, MVT::i64, Custom);
669 setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
670 }
671
672 // We want to custom lower some of our intrinsics.
673 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
674 if (Subtarget->isTargetDarwin()) {
675 setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
676 setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
677 setOperationAction(ISD::EH_SJLJ_DISPATCHSETUP, MVT::Other, Custom);
678 setLibcallName(RTLIB::UNWIND_RESUME, "_Unwind_SjLj_Resume");
679 }
680
681 setOperationAction(ISD::SETCC, MVT::i32, Expand);
682 setOperationAction(ISD::SETCC, MVT::f32, Expand);
683 setOperationAction(ISD::SETCC, MVT::f64, Expand);
684 setOperationAction(ISD::SELECT, MVT::i32, Custom);
685 setOperationAction(ISD::SELECT, MVT::f32, Custom);
686 setOperationAction(ISD::SELECT, MVT::f64, Custom);
687 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
688 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
689 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
690
691 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
692 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
693 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
694 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
695 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
696
697 // We don't support sin/cos/fmod/copysign/pow
698 setOperationAction(ISD::FSIN, MVT::f64, Expand);
699 setOperationAction(ISD::FSIN, MVT::f32, Expand);
700 setOperationAction(ISD::FCOS, MVT::f32, Expand);
701 setOperationAction(ISD::FCOS, MVT::f64, Expand);
702 setOperationAction(ISD::FREM, MVT::f64, Expand);
703 setOperationAction(ISD::FREM, MVT::f32, Expand);
704 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
705 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
706 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
707 }
708 setOperationAction(ISD::FPOW, MVT::f64, Expand);
709 setOperationAction(ISD::FPOW, MVT::f32, Expand);
710
711 setOperationAction(ISD::FMA, MVT::f64, Expand);
712 setOperationAction(ISD::FMA, MVT::f32, Expand);
713
714 // Various VFP goodness
715 if (!UseSoftFloat && !Subtarget->isThumb1Only()) {
716 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
717 if (Subtarget->hasVFP2()) {
718 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
719 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
720 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
721 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
722 }
723 // Special handling for half-precision FP.
724 if (!Subtarget->hasFP16()) {
725 setOperationAction(ISD::FP16_TO_FP32, MVT::f32, Expand);
726 setOperationAction(ISD::FP32_TO_FP16, MVT::i32, Expand);
727 }
728 }
729
730 // We have target-specific dag combine patterns for the following nodes:
731 // ARMISD::VMOVRRD - No need to call setTargetDAGCombine
732 setTargetDAGCombine(ISD::ADD);
733 setTargetDAGCombine(ISD::SUB);
734 setTargetDAGCombine(ISD::MUL);
735
736 if (Subtarget->hasV6T2Ops() || Subtarget->hasNEON())
737 setTargetDAGCombine(ISD::OR);
738 if (Subtarget->hasNEON())
739 setTargetDAGCombine(ISD::AND);
740
741 setStackPointerRegisterToSaveRestore(ARM::SP);
742
743 if (UseSoftFloat || Subtarget->isThumb1Only() || !Subtarget->hasVFP2())
744 setSchedulingPreference(Sched::RegPressure);
745 else
746 setSchedulingPreference(Sched::Hybrid);
747
748 //// temporary - rewrite interface to use type
749 maxStoresPerMemcpy = maxStoresPerMemcpyOptSize = 1;
750
751 // On ARM arguments smaller than 4 bytes are extended, so all arguments
752 // are at least 4 bytes aligned.
753 setMinStackArgumentAlignment(4);
754
755 benefitFromCodePlacementOpt = true;
756
757 setMinFunctionAlignment(Subtarget->isThumb() ? 1 : 2);
758 }
759
760 // FIXME: It might make sense to define the representative register class as the
761 // nearest super-register that has a non-null superset. For example, DPR_VFP2 is
762 // a super-register of SPR, and DPR is a superset if DPR_VFP2. Consequently,
763 // SPR's representative would be DPR_VFP2. This should work well if register
764 // pressure tracking were modified such that a register use would increment the
765 // pressure of the register class's representative and all of it's super
766 // classes' representatives transitively. We have not implemented this because
767 // of the difficulty prior to coalescing of modeling operand register classes
768 // due to the common occurrence of cross class copies and subregister insertions
769 // and extractions.
770 std::pair<const TargetRegisterClass*, uint8_t>
771 ARMTargetLowering::findRepresentativeClass(EVT VT) const{
772 const TargetRegisterClass *RRC = 0;
773 uint8_t Cost = 1;
774 switch (VT.getSimpleVT().SimpleTy) {
775 default:
776 return TargetLowering::findRepresentativeClass(VT);
777 // Use DPR as representative register class for all floating point
778 // and vector types. Since there are 32 SPR registers and 32 DPR registers so
779 // the cost is 1 for both f32 and f64.
780 case MVT::f32: case MVT::f64: case MVT::v8i8: case MVT::v4i16:
781 case MVT::v2i32: case MVT::v1i64: case MVT::v2f32:
782 RRC = ARM::DPRRegisterClass;
783 // When NEON is used for SP, only half of the register file is available
784 // because operations that define both SP and DP results will be constrained
785 // to the VFP2 class (D0-D15). We currently model this constraint prior to
786 // coalescing by double-counting the SP regs. See the FIXME above.
787 if (Subtarget->useNEONForSinglePrecisionFP())
788 Cost = 2;
789 break;
790 case MVT::v16i8: case MVT::v8i16: case MVT::v4i32: case MVT::v2i64:
791 case MVT::v4f32: case MVT::v2f64:
792 RRC = ARM::DPRRegisterClass;
793 Cost = 2;
794 break;
795 case MVT::v4i64:
796 RRC = ARM::DPRRegisterClass;
797 Cost = 4;
798 break;
799 case MVT::v8i64:
800 RRC = ARM::DPRRegisterClass;
801 Cost = 8;
802 break;
803 }
804 return std::make_pair(RRC, Cost);
805 }
806
807 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
808 switch (Opcode) {
809 default: return 0;
810 case ARMISD::Wrapper: return "ARMISD::Wrapper";
811 case ARMISD::WrapperDYN: return "ARMISD::WrapperDYN";
812 case ARMISD::WrapperPIC: return "ARMISD::WrapperPIC";
813 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
814 case ARMISD::CALL: return "ARMISD::CALL";
815 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
816 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
817 case ARMISD::tCALL: return "ARMISD::tCALL";
818 case ARMISD::BRCOND: return "ARMISD::BRCOND";
819 case ARMISD::BR_JT: return "ARMISD::BR_JT";
820 case ARMISD::BR2_JT: return "ARMISD::BR2_JT";
821 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
822 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
823 case ARMISD::CMP: return "ARMISD::CMP";
824 case ARMISD::CMPZ: return "ARMISD::CMPZ";
825 case ARMISD::CMPFP: return "ARMISD::CMPFP";
826 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
827 case ARMISD::BCC_i64: return "ARMISD::BCC_i64";
828 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
829 case ARMISD::CMOV: return "ARMISD::CMOV";
830
831 case ARMISD::RBIT: return "ARMISD::RBIT";
832
833 case ARMISD::FTOSI: return "ARMISD::FTOSI";
834 case ARMISD::FTOUI: return "ARMISD::FTOUI";
835 case ARMISD::SITOF: return "ARMISD::SITOF";
836 case ARMISD::UITOF: return "ARMISD::UITOF";
837
838 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
839 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
840 case ARMISD::RRX: return "ARMISD::RRX";
841
842 case ARMISD::VMOVRRD: return "ARMISD::VMOVRRD";
843 case ARMISD::VMOVDRR: return "ARMISD::VMOVDRR";
844
845 case ARMISD::EH_SJLJ_SETJMP: return "ARMISD::EH_SJLJ_SETJMP";
846 case ARMISD::EH_SJLJ_LONGJMP:return "ARMISD::EH_SJLJ_LONGJMP";
847 case ARMISD::EH_SJLJ_DISPATCHSETUP:return "ARMISD::EH_SJLJ_DISPATCHSETUP";
848
849 case ARMISD::TC_RETURN: return "ARMISD::TC_RETURN";
850
851 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
852
853 case ARMISD::DYN_ALLOC: return "ARMISD::DYN_ALLOC";
854
855 case ARMISD::MEMBARRIER: return "ARMISD::MEMBARRIER";
856 case ARMISD::MEMBARRIER_MCR: return "ARMISD::MEMBARRIER_MCR";
857
858 case ARMISD::PRELOAD: return "ARMISD::PRELOAD";
859
860 case ARMISD::VCEQ: return "ARMISD::VCEQ";
861 case ARMISD::VCEQZ: return "ARMISD::VCEQZ";
862 case ARMISD::VCGE: return "ARMISD::VCGE";
863 case ARMISD::VCGEZ: return "ARMISD::VCGEZ";
864 case ARMISD::VCLEZ: return "ARMISD::VCLEZ";
865 case ARMISD::VCGEU: return "ARMISD::VCGEU";
866 case ARMISD::VCGT: return "ARMISD::VCGT";
867 case ARMISD::VCGTZ: return "ARMISD::VCGTZ";
868 case ARMISD::VCLTZ: return "ARMISD::VCLTZ";
869 case ARMISD::VCGTU: return "ARMISD::VCGTU";
870 case ARMISD::VTST: return "ARMISD::VTST";
871
872 case ARMISD::VSHL: return "ARMISD::VSHL";
873 case ARMISD::VSHRs: return "ARMISD::VSHRs";
874 case ARMISD::VSHRu: return "ARMISD::VSHRu";
875 case ARMISD::VSHLLs: return "ARMISD::VSHLLs";
876 case ARMISD::VSHLLu: return "ARMISD::VSHLLu";
877 case ARMISD::VSHLLi: return "ARMISD::VSHLLi";
878 case ARMISD::VSHRN: return "ARMISD::VSHRN";
879 case ARMISD::VRSHRs: return "ARMISD::VRSHRs";
880 case ARMISD::VRSHRu: return "ARMISD::VRSHRu";
881 case ARMISD::VRSHRN: return "ARMISD::VRSHRN";
882 case ARMISD::VQSHLs: return "ARMISD::VQSHLs";
883 case ARMISD::VQSHLu: return "ARMISD::VQSHLu";
884 case ARMISD::VQSHLsu: return "ARMISD::VQSHLsu";
885 case ARMISD::VQSHRNs: return "ARMISD::VQSHRNs";
886 case ARMISD::VQSHRNu: return "ARMISD::VQSHRNu";
887 case ARMISD::VQSHRNsu: return "ARMISD::VQSHRNsu";
888 case ARMISD::VQRSHRNs: return "ARMISD::VQRSHRNs";
889 case ARMISD::VQRSHRNu: return "ARMISD::VQRSHRNu";
890 case ARMISD::VQRSHRNsu: return "ARMISD::VQRSHRNsu";
891 case ARMISD::VGETLANEu: return "ARMISD::VGETLANEu";
892 case ARMISD::VGETLANEs: return "ARMISD::VGETLANEs";
893 case ARMISD::VMOVIMM: return "ARMISD::VMOVIMM";
894 case ARMISD::VMVNIMM: return "ARMISD::VMVNIMM";
895 case ARMISD::VDUP: return "ARMISD::VDUP";
896 case ARMISD::VDUPLANE: return "ARMISD::VDUPLANE";
897 case ARMISD::VEXT: return "ARMISD::VEXT";
898 case ARMISD::VREV64: return "ARMISD::VREV64";
899 case ARMISD::VREV32: return "ARMISD::VREV32";
900 case ARMISD::VREV16: return "ARMISD::VREV16";
901 case ARMISD::VZIP: return "ARMISD::VZIP";
902 case ARMISD::VUZP: return "ARMISD::VUZP";
903 case ARMISD::VTRN: return "ARMISD::VTRN";
904 case ARMISD::VTBL1: return "ARMISD::VTBL1";
905 case ARMISD::VTBL2: return "ARMISD::VTBL2";
906 case ARMISD::VMULLs: return "ARMISD::VMULLs";
907 case ARMISD::VMULLu: return "ARMISD::VMULLu";
908 case ARMISD::BUILD_VECTOR: return "ARMISD::BUILD_VECTOR";
909 case ARMISD::FMAX: return "ARMISD::FMAX";
910 case ARMISD::FMIN: return "ARMISD::FMIN";
911 case ARMISD::BFI: return "ARMISD::BFI";
912 case ARMISD::VORRIMM: return "ARMISD::VORRIMM";
913 case ARMISD::VBICIMM: return "ARMISD::VBICIMM";
914 case ARMISD::VBSL: return "ARMISD::VBSL";
915 case ARMISD::VLD2DUP: return "ARMISD::VLD2DUP";
916 case ARMISD::VLD3DUP: return "ARMISD::VLD3DUP";
917 case ARMISD::VLD4DUP: return "ARMISD::VLD4DUP";
918 case ARMISD::VLD1_UPD: return "ARMISD::VLD1_UPD";
919 case ARMISD::VLD2_UPD: return "ARMISD::VLD2_UPD";
920 case ARMISD::VLD3_UPD: return "ARMISD::VLD3_UPD";
921 case ARMISD::VLD4_UPD: return "ARMISD::VLD4_UPD";
922 case ARMISD::VLD2LN_UPD: return "ARMISD::VLD2LN_UPD";
923 case ARMISD::VLD3LN_UPD: return "ARMISD::VLD3LN_UPD";
924 case ARMISD::VLD4LN_UPD: return "ARMISD::VLD4LN_UPD";
925 case ARMISD::VLD2DUP_UPD: return "ARMISD::VLD2DUP_UPD";
926 case ARMISD::VLD3DUP_UPD: return "ARMISD::VLD3DUP_UPD";
927 case ARMISD::VLD4DUP_UPD: return "ARMISD::VLD4DUP_UPD";
928 case ARMISD::VST1_UPD: return "ARMISD::VST1_UPD";
929 case ARMISD::VST2_UPD: return "ARMISD::VST2_UPD";
930 case ARMISD::VST3_UPD: return "ARMISD::VST3_UPD";
931 case ARMISD::VST4_UPD: return "ARMISD::VST4_UPD";
932 case ARMISD::VST2LN_UPD: return "ARMISD::VST2LN_UPD";
933 case ARMISD::VST3LN_UPD: return "ARMISD::VST3LN_UPD";
934 case ARMISD::VST4LN_UPD: return "ARMISD::VST4LN_UPD";
935 }
936 }
937
938 /// getRegClassFor - Return the register class that should be used for the
939 /// specified value type.
940 TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
941 // Map v4i64 to QQ registers but do not make the type legal. Similarly map
942 // v8i64 to QQQQ registers. v4i64 and v8i64 are only used for REG_SEQUENCE to
943 // load / store 4 to 8 consecutive D registers.
944 if (Subtarget->hasNEON()) {
945 if (VT == MVT::v4i64)
946 return ARM::QQPRRegisterClass;
947 else if (VT == MVT::v8i64)
948 return ARM::QQQQPRRegisterClass;
949 }
950 return TargetLowering::getRegClassFor(VT);
951 }
952
953 // Create a fast isel object.
954 FastISel *
955 ARMTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
956 return ARM::createFastISel(funcInfo);
957 }
958
959 /// getMaximalGlobalOffset - Returns the maximal possible offset which can
960 /// be used for loads / stores from the global.
961 unsigned ARMTargetLowering::getMaximalGlobalOffset() const {
962 return (Subtarget->isThumb1Only() ? 127 : 4095);
963 }
964
965 Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const {
966 unsigned NumVals = N->getNumValues();
967 if (!NumVals)
968 return Sched::RegPressure;
969
970 for (unsigned i = 0; i != NumVals; ++i) {
971 EVT VT = N->getValueType(i);
972 if (VT == MVT::Glue || VT == MVT::Other)
973 continue;
974 if (VT.isFloatingPoint() || VT.isVector())
975 return Sched::Latency;
976 }
977
978 if (!N->isMachineOpcode())
979 return Sched::RegPressure;
980
981 // Load are scheduled for latency even if there instruction itinerary
982 // is not available.
983 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
984 const MCInstrDesc &MCID = TII->get(N->getMachineOpcode());
985
986 if (MCID.getNumDefs() == 0)
987 return Sched::RegPressure;
988 if (!Itins->isEmpty() &&
989 Itins->getOperandCycle(MCID.getSchedClass(), 0) > 2)
990 return Sched::Latency;
991
992 return Sched::RegPressure;
993 }
994
995 //===----------------------------------------------------------------------===//
996 // Lowering Code
997 //===----------------------------------------------------------------------===//
998
999 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
1000 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
1001 switch (CC) {
1002 default: llvm_unreachable("Unknown condition code!");
1003 case ISD::SETNE: return ARMCC::NE;
1004 case ISD::SETEQ: return ARMCC::EQ;
1005 case ISD::SETGT: return ARMCC::GT;
1006 case ISD::SETGE: return ARMCC::GE;
1007 case ISD::SETLT: return ARMCC::LT;
1008 case ISD::SETLE: return ARMCC::LE;
1009 case ISD::SETUGT: return ARMCC::HI;
1010 case ISD::SETUGE: return ARMCC::HS;
1011 case ISD::SETULT: return ARMCC::LO;
1012 case ISD::SETULE: return ARMCC::LS;
1013 }
1014 }
1015
1016 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC.
1017 static void FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
1018 ARMCC::CondCodes &CondCode2) {
1019 CondCode2 = ARMCC::AL;
1020 switch (CC) {
1021 default: llvm_unreachable("Unknown FP condition!");
1022 case ISD::SETEQ:
1023 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
1024 case ISD::SETGT:
1025 case ISD::SETOGT: CondCode = ARMCC::GT; break;
1026 case ISD::SETGE:
1027 case ISD::SETOGE: CondCode = ARMCC::GE; break;
1028 case ISD::SETOLT: CondCode = ARMCC::MI; break;
1029 case ISD::SETOLE: CondCode = ARMCC::LS; break;
1030 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
1031 case ISD::SETO: CondCode = ARMCC::VC; break;
1032 case ISD::SETUO: CondCode = ARMCC::VS; break;
1033 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
1034 case ISD::SETUGT: CondCode = ARMCC::HI; break;
1035 case ISD::SETUGE: CondCode = ARMCC::PL; break;
1036 case ISD::SETLT:
1037 case ISD::SETULT: CondCode = ARMCC::LT; break;
1038 case ISD::SETLE:
1039 case ISD::SETULE: CondCode = ARMCC::LE; break;
1040 case ISD::SETNE:
1041 case ISD::SETUNE: CondCode = ARMCC::NE; break;
1042 }
1043 }
1044
1045 //===----------------------------------------------------------------------===//
1046 // Calling Convention Implementation
1047 //===----------------------------------------------------------------------===//
1048
1049 #include "ARMGenCallingConv.inc"
1050
1051 /// CCAssignFnForNode - Selects the correct CCAssignFn for a the
1052 /// given CallingConvention value.
1053 CCAssignFn *ARMTargetLowering::CCAssignFnForNode(CallingConv::ID CC,
1054 bool Return,
1055 bool isVarArg) const {
1056 switch (CC) {
1057 default:
1058 llvm_unreachable("Unsupported calling convention");
1059 case CallingConv::Fast:
1060 if (Subtarget->hasVFP2() && !isVarArg) {
1061 if (!Subtarget->isAAPCS_ABI())
1062 return (Return ? RetFastCC_ARM_APCS : FastCC_ARM_APCS);
1063 // For AAPCS ABI targets, just use VFP variant of the calling convention.
1064 return (Return ? RetCC_ARM_AAPCS_VFP : CC_ARM_AAPCS_VFP);
1065 }
1066 // Fallthrough
1067 case CallingConv::C: {
1068 // Use target triple & subtarget features to do actual dispatch.
1069 if (!Subtarget->isAAPCS_ABI())
1070 return (Return ? RetCC_ARM_APCS : CC_ARM_APCS);
1071 else if (Subtarget->hasVFP2() &&
1072 FloatABIType == FloatABI::Hard && !isVarArg)
1073 return (Return ? RetCC_ARM_AAPCS_VFP : CC_ARM_AAPCS_VFP);
1074 return (Return ? RetCC_ARM_AAPCS : CC_ARM_AAPCS);
1075 }
1076 case CallingConv::ARM_AAPCS_VFP:
1077 return (Return ? RetCC_ARM_AAPCS_VFP : CC_ARM_AAPCS_VFP);
1078 case CallingConv::ARM_AAPCS:
1079 return (Return ? RetCC_ARM_AAPCS : CC_ARM_AAPCS);
1080 case CallingConv::ARM_APCS:
1081 return (Return ? RetCC_ARM_APCS : CC_ARM_APCS);
1082 }
1083 }
1084
1085 /// LowerCallResult - Lower the result values of a call into the
1086 /// appropriate copies out of appropriate physical registers.
1087 SDValue
1088 ARMTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
1089 CallingConv::ID CallConv, bool isVarArg,
1090 const SmallVectorImpl<ISD::InputArg> &Ins,
1091 DebugLoc dl, SelectionDAG &DAG,
1092 SmallVectorImpl<SDValue> &InVals) const {
1093
1094 // Assign locations to each value returned by this call.
1095 SmallVector<CCValAssign, 16> RVLocs;
1096 ARMCCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1097 getTargetMachine(), RVLocs, *DAG.getContext(), Call);
1098 CCInfo.AnalyzeCallResult(Ins,
1099 CCAssignFnForNode(CallConv, /* Return*/ true,
1100 isVarArg));
1101
1102 // Copy all of the result registers out of their specified physreg.
1103 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1104 CCValAssign VA = RVLocs[i];
1105
1106 SDValue Val;
1107 if (VA.needsCustom()) {
1108 // Handle f64 or half of a v2f64.
1109 SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
1110 InFlag);
1111 Chain = Lo.getValue(1);
1112 InFlag = Lo.getValue(2);
1113 VA = RVLocs[++i]; // skip ahead to next loc
1114 SDValue Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
1115 InFlag);
1116 Chain = Hi.getValue(1);
1117 InFlag = Hi.getValue(2);
1118 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
1119
1120 if (VA.getLocVT() == MVT::v2f64) {
1121 SDValue Vec = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
1122 Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
1123 DAG.getConstant(0, MVT::i32));
1124
1125 VA = RVLocs[++i]; // skip ahead to next loc
1126 Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
1127 Chain = Lo.getValue(1);
1128 InFlag = Lo.getValue(2);
1129 VA = RVLocs[++i]; // skip ahead to next loc
1130 Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
1131 Chain = Hi.getValue(1);
1132 InFlag = Hi.getValue(2);
1133 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
1134 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
1135 DAG.getConstant(1, MVT::i32));
1136 }
1137 } else {
1138 Val = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(),
1139 InFlag);
1140 Chain = Val.getValue(1);
1141 InFlag = Val.getValue(2);
1142 }
1143
1144 switch (VA.getLocInfo()) {
1145 default: llvm_unreachable("Unknown loc info!");
1146 case CCValAssign::Full: break;
1147 case CCValAssign::BCvt:
1148 Val = DAG.getNode(ISD::BITCAST, dl, VA.getValVT(), Val);
1149 break;
1150 }
1151
1152 InVals.push_back(Val);
1153 }
1154
1155 return Chain;
1156 }
1157
1158 /// LowerMemOpCallTo - Store the argument to the stack.
1159 SDValue
1160 ARMTargetLowering::LowerMemOpCallTo(SDValue Chain,
1161 SDValue StackPtr, SDValue Arg,
1162 DebugLoc dl, SelectionDAG &DAG,
1163 const CCValAssign &VA,
1164 ISD::ArgFlagsTy Flags) const {
1165 unsigned LocMemOffset = VA.getLocMemOffset();
1166 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
1167 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
1168 return DAG.getStore(Chain, dl, Arg, PtrOff,
1169 MachinePointerInfo::getStack(LocMemOffset),
1170 false, false, 0);
1171 }
1172
1173 void ARMTargetLowering::PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG,
1174 SDValue Chain, SDValue &Arg,
1175 RegsToPassVector &RegsToPass,
1176 CCValAssign &VA, CCValAssign &NextVA,
1177 SDValue &StackPtr,
1178 SmallVector<SDValue, 8> &MemOpChains,
1179 ISD::ArgFlagsTy Flags) const {
1180
1181 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
1182 DAG.getVTList(MVT::i32, MVT::i32), Arg);
1183 RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd));
1184
1185 if (NextVA.isRegLoc())
1186 RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), fmrrd.getValue(1)));
1187 else {
1188 assert(NextVA.isMemLoc());
1189 if (StackPtr.getNode() == 0)
1190 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
1191
1192 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, fmrrd.getValue(1),
1193 dl, DAG, NextVA,
1194 Flags));
1195 }
1196 }
1197
1198 /// LowerCall - Lowering a call into a callseq_start <-
1199 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
1200 /// nodes.
1201 SDValue
1202 ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
1203 CallingConv::ID CallConv, bool isVarArg,
1204 bool &isTailCall,
1205 const SmallVectorImpl<ISD::OutputArg> &Outs,
1206 const SmallVectorImpl<SDValue> &OutVals,
1207 const SmallVectorImpl<ISD::InputArg> &Ins,
1208 DebugLoc dl, SelectionDAG &DAG,
1209 SmallVectorImpl<SDValue> &InVals) const {
1210 MachineFunction &MF = DAG.getMachineFunction();
1211 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
1212 bool IsSibCall = false;
1213 // Temporarily disable tail calls so things don't break.
1214 if (!EnableARMTailCalls)
1215 isTailCall = false;
1216 if (isTailCall) {
1217 // Check if it's really possible to do a tail call.
1218 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
1219 isVarArg, IsStructRet, MF.getFunction()->hasStructRetAttr(),
1220 Outs, OutVals, Ins, DAG);
1221 // We don't support GuaranteedTailCallOpt for ARM, only automatically
1222 // detected sibcalls.
1223 if (isTailCall) {
1224 ++NumTailCalls;
1225 IsSibCall = true;
1226 }
1227 }
1228
1229 // Analyze operands of the call, assigning locations to each operand.
1230 SmallVector<CCValAssign, 16> ArgLocs;
1231 ARMCCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1232 getTargetMachine(), ArgLocs, *DAG.getContext(), Call);
1233 CCInfo.AnalyzeCallOperands(Outs,
1234 CCAssignFnForNode(CallConv, /* Return*/ false,
1235 isVarArg));
1236
1237 // Get a count of how many bytes are to be pushed on the stack.
1238 unsigned NumBytes = CCInfo.getNextStackOffset();
1239
1240 // For tail calls, memory operands are available in our caller's stack.
1241 if (IsSibCall)
1242 NumBytes = 0;
1243
1244 // Adjust the stack pointer for the new arguments...
1245 // These operations are automatically eliminated by the prolog/epilog pass
1246 if (!IsSibCall)
1247 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
1248
1249 SDValue StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
1250
1251 RegsToPassVector RegsToPass;
1252 SmallVector<SDValue, 8> MemOpChains;
1253
1254 // Walk the register/memloc assignments, inserting copies/loads. In the case
1255 // of tail call optimization, arguments are handled later.
1256 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
1257 i != e;
1258 ++i, ++realArgIdx) {
1259 CCValAssign &VA = ArgLocs[i];
1260 SDValue Arg = OutVals[realArgIdx];
1261 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
1262 bool isByVal = Flags.isByVal();
1263
1264 // Promote the value if needed.
1265 switch (VA.getLocInfo()) {
1266 default: llvm_unreachable("Unknown loc info!");
1267 case CCValAssign::Full: break;
1268 case CCValAssign::SExt:
1269 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
1270 break;
1271 case CCValAssign::ZExt:
1272 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
1273 break;
1274 case CCValAssign::AExt:
1275 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
1276 break;
1277 case CCValAssign::BCvt:
1278 Arg = DAG.getNode(ISD::BITCAST, dl, VA.getLocVT(), Arg);
1279 break;
1280 }
1281
1282 // f64 and v2f64 might be passed in i32 pairs and must be split into pieces
1283 if (VA.needsCustom()) {
1284 if (VA.getLocVT() == MVT::v2f64) {
1285 SDValue Op0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1286 DAG.getConstant(0, MVT::i32));
1287 SDValue Op1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1288 DAG.getConstant(1, MVT::i32));
1289
1290 PassF64ArgInRegs(dl, DAG, Chain, Op0, RegsToPass,
1291 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
1292
1293 VA = ArgLocs[++i]; // skip ahead to next loc
1294 if (VA.isRegLoc()) {
1295 PassF64ArgInRegs(dl, DAG, Chain, Op1, RegsToPass,
1296 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
1297 } else {
1298 assert(VA.isMemLoc());
1299
1300 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Op1,
1301 dl, DAG, VA, Flags));
1302 }
1303 } else {
1304 PassF64ArgInRegs(dl, DAG, Chain, Arg, RegsToPass, VA, ArgLocs[++i],
1305 StackPtr, MemOpChains, Flags);
1306 }
1307 } else if (VA.isRegLoc()) {
1308 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
1309 } else if (isByVal) {
1310 assert(VA.isMemLoc());
1311 unsigned offset = 0;
1312
1313 // True if this byval aggregate will be split between registers
1314 // and memory.
1315 if (CCInfo.isFirstByValRegValid()) {
1316 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1317 unsigned int i, j;
1318 for (i = 0, j = CCInfo.getFirstByValReg(); j < ARM::R4; i++, j++) {
1319 SDValue Const = DAG.getConstant(4*i, MVT::i32);
1320 SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
1321 SDValue Load = DAG.getLoad(PtrVT, dl, Chain, AddArg,
1322 MachinePointerInfo(),
1323 false, false, 0);
1324 MemOpChains.push_back(Load.getValue(1));
1325 RegsToPass.push_back(std::make_pair(j, Load));
1326 }
1327 offset = ARM::R4 - CCInfo.getFirstByValReg();
1328 CCInfo.clearFirstByValReg();
1329 }
1330
1331 unsigned LocMemOffset = VA.getLocMemOffset();
1332 SDValue StkPtrOff = DAG.getIntPtrConstant(LocMemOffset);
1333 SDValue Dst = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr,
1334 StkPtrOff);
1335 SDValue SrcOffset = DAG.getIntPtrConstant(4*offset);
1336 SDValue Src = DAG.getNode(ISD::ADD, dl, getPointerTy(), Arg, SrcOffset);
1337 SDValue SizeNode = DAG.getConstant(Flags.getByValSize() - 4*offset,
1338 MVT::i32);
1339 MemOpChains.push_back(DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode,
1340 Flags.getByValAlign(),
1341 /*isVolatile=*/false,
1342 /*AlwaysInline=*/false,
1343 MachinePointerInfo(0),
1344 MachinePointerInfo(0)));
1345
1346 } else if (!IsSibCall) {
1347 assert(VA.isMemLoc());
1348
1349 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
1350 dl, DAG, VA, Flags));
1351 }
1352 }
1353
1354 if (!MemOpChains.empty())
1355 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1356 &MemOpChains[0], MemOpChains.size());
1357
1358 // Build a sequence of copy-to-reg nodes chained together with token chain
1359 // and flag operands which copy the outgoing args into the appropriate regs.
1360 SDValue InFlag;
1361 // Tail call byval lowering might overwrite argument registers so in case of
1362 // tail call optimization the copies to registers are lowered later.
1363 if (!isTailCall)
1364 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1365 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1366 RegsToPass[i].second, InFlag);
1367 InFlag = Chain.getValue(1);
1368 }
1369
1370 // For tail calls lower the arguments to the 'real' stack slot.
1371 if (isTailCall) {
1372 // Force all the incoming stack arguments to be loaded from the stack
1373 // before any new outgoing arguments are stored to the stack, because the
1374 // outgoing stack slots may alias the incoming argument stack slots, and
1375 // the alias isn't otherwise explicit. This is slightly more conservative
1376 // than necessary, because it means that each store effectively depends
1377 // on every argument instead of just those arguments it would clobber.
1378
1379 // Do not flag preceding copytoreg stuff together with the following stuff.
1380 InFlag = SDValue();
1381 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1382 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1383 RegsToPass[i].second, InFlag);
1384 InFlag = Chain.getValue(1);
1385 }
1386 InFlag =SDValue();
1387 }
1388
1389 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
1390 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
1391 // node so that legalize doesn't hack it.
1392 bool isDirect = false;
1393 bool isARMFunc = false;
1394 bool isLocalARMFunc = false;
1395 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1396
1397 if (EnableARMLongCalls) {
1398 assert (getTargetMachine().getRelocationModel() == Reloc::Static
1399 && "long-calls with non-static relocation model!");
1400 // Handle a global address or an external symbol. If it's not one of
1401 // those, the target's already in a register, so we don't need to do
1402 // anything extra.
1403 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1404 const GlobalValue *GV = G->getGlobal();
1405 // Create a constant pool entry for the callee address
1406 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
1407 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1408 ARMPCLabelIndex,
1409 ARMCP::CPValue, 0);
1410 // Get the address of the callee into a register
1411 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1412 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1413 Callee = DAG.getLoad(getPointerTy(), dl,
1414 DAG.getEntryNode(), CPAddr,
1415 MachinePointerInfo::getConstantPool(),
1416 false, false, 0);
1417 } else if (ExternalSymbolSDNode *S=dyn_cast<ExternalSymbolSDNode>(Callee)) {
1418 const char *Sym = S->getSymbol();
1419
1420 // Create a constant pool entry for the callee address
1421 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
1422 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1423 Sym, ARMPCLabelIndex, 0);
1424 // Get the address of the callee into a register
1425 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1426 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1427 Callee = DAG.getLoad(getPointerTy(), dl,
1428 DAG.getEntryNode(), CPAddr,
1429 MachinePointerInfo::getConstantPool(),
1430 false, false, 0);
1431 }
1432 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1433 const GlobalValue *GV = G->getGlobal();
1434 isDirect = true;
1435 bool isExt = GV->isDeclaration() || GV->isWeakForLinker();
1436 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
1437 getTargetMachine().getRelocationModel() != Reloc::Static;
1438 isARMFunc = !Subtarget->isThumb() || isStub;
1439 // ARM call to a local ARM function is predicable.
1440 isLocalARMFunc = !Subtarget->isThumb() && (!isExt || !ARMInterworking);
1441 // tBX takes a register source operand.
1442 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1443 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
1444 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1445 ARMPCLabelIndex,
1446 ARMCP::CPValue, 4);
1447 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1448 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1449 Callee = DAG.getLoad(getPointerTy(), dl,
1450 DAG.getEntryNode(), CPAddr,
1451 MachinePointerInfo::getConstantPool(),
1452 false, false, 0);
1453 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1454 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1455 getPointerTy(), Callee, PICLabel);
1456 } else {
1457 // On ELF targets for PIC code, direct calls should go through the PLT
1458 unsigned OpFlags = 0;
1459 if (Subtarget->isTargetELF() &&
1460 getTargetMachine().getRelocationModel() == Reloc::PIC_)
1461 OpFlags = ARMII::MO_PLT;
1462 Callee = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(), 0, OpFlags);
1463 }
1464 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
1465 isDirect = true;
1466 bool isStub = Subtarget->isTargetDarwin() &&
1467 getTargetMachine().getRelocationModel() != Reloc::Static;
1468 isARMFunc = !Subtarget->isThumb() || isStub;
1469 // tBX takes a register source operand.
1470 const char *Sym = S->getSymbol();
1471 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1472 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
1473 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1474 Sym, ARMPCLabelIndex, 4);
1475 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1476 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1477 Callee = DAG.getLoad(getPointerTy(), dl,
1478 DAG.getEntryNode(), CPAddr,
1479 MachinePointerInfo::getConstantPool(),
1480 false, false, 0);
1481 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1482 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1483 getPointerTy(), Callee, PICLabel);
1484 } else {
1485 unsigned OpFlags = 0;
1486 // On ELF targets for PIC code, direct calls should go through the PLT
1487 if (Subtarget->isTargetELF() &&
1488 getTargetMachine().getRelocationModel() == Reloc::PIC_)
1489 OpFlags = ARMII::MO_PLT;
1490 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy(), OpFlags);
1491 }
1492 }
1493
1494 // FIXME: handle tail calls differently.
1495 unsigned CallOpc;
1496 if (Subtarget->isThumb()) {
1497 if ((!isDirect || isARMFunc) && !Subtarget->hasV5TOps())
1498 CallOpc = ARMISD::CALL_NOLINK;
1499 else
1500 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
1501 } else {
1502 CallOpc = (isDirect || Subtarget->hasV5TOps())
1503 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
1504 : ARMISD::CALL_NOLINK;
1505 }
1506
1507 std::vector<SDValue> Ops;
1508 Ops.push_back(Chain);
1509 Ops.push_back(Callee);
1510
1511 // Add argument registers to the end of the list so that they are known live
1512 // into the call.
1513 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1514 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1515 RegsToPass[i].second.getValueType()));
1516
1517 if (InFlag.getNode())
1518 Ops.push_back(InFlag);
1519
1520 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
1521 if (isTailCall)
1522 return DAG.getNode(ARMISD::TC_RETURN, dl, NodeTys, &Ops[0], Ops.size());
1523
1524 // Returns a chain and a flag for retval copy to use.
1525 Chain = DAG.getNode(CallOpc, dl, NodeTys, &Ops[0], Ops.size());
1526 InFlag = Chain.getValue(1);
1527
1528 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
1529 DAG.getIntPtrConstant(0, true), InFlag);
1530 if (!Ins.empty())
1531 InFlag = Chain.getValue(1);
1532
1533 // Handle result values, copying them out of physregs into vregs that we
1534 // return.
1535 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins,
1536 dl, DAG, InVals);
1537 }
1538
1539 /// HandleByVal - Every parameter *after* a byval parameter is passed
1540 /// on the stack. Remember the next parameter register to allocate,
1541 /// and then confiscate the rest of the parameter registers to insure
1542 /// this.
1543 void
1544 llvm::ARMTargetLowering::HandleByVal(CCState *State, unsigned &size) const {
1545 unsigned reg = State->AllocateReg(GPRArgRegs, 4);
1546 assert((State->getCallOrPrologue() == Prologue ||
1547 State->getCallOrPrologue() == Call) &&
1548 "unhandled ParmContext");
1549 if ((!State->isFirstByValRegValid()) &&
1550 (ARM::R0 <= reg) && (reg <= ARM::R3)) {
1551 State->setFirstByValReg(reg);
1552 // At a call site, a byval parameter that is split between
1553 // registers and memory needs its size truncated here. In a
1554 // function prologue, such byval parameters are reassembled in
1555 // memory, and are not truncated.
1556 if (State->getCallOrPrologue() == Call) {
1557 unsigned excess = 4 * (ARM::R4 - reg);
1558 assert(size >= excess && "expected larger existing stack allocation");
1559 size -= excess;
1560 }
1561 }
1562 // Confiscate any remaining parameter registers to preclude their
1563 // assignment to subsequent parameters.
1564 while (State->AllocateReg(GPRArgRegs, 4))
1565 ;
1566 }
1567
1568 /// MatchingStackOffset - Return true if the given stack call argument is
1569 /// already available in the same position (relatively) of the caller's
1570 /// incoming argument stack.
1571 static
1572 bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
1573 MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
1574 const ARMInstrInfo *TII) {
1575 unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
1576 int FI = INT_MAX;
1577 if (Arg.getOpcode() == ISD::CopyFromReg) {
1578 unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
1579 if (!TargetRegisterInfo::isVirtualRegister(VR))
1580 return false;
1581 MachineInstr *Def = MRI->getVRegDef(VR);
1582 if (!Def)
1583 return false;
1584 if (!Flags.isByVal()) {
1585 if (!TII->isLoadFromStackSlot(Def, FI))
1586 return false;
1587 } else {
1588 return false;
1589 }
1590 } else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
1591 if (Flags.isByVal())
1592 // ByVal argument is passed in as a pointer but it's now being
1593 // dereferenced. e.g.
1594 // define @foo(%struct.X* %A) {
1595 // tail call @bar(%struct.X* byval %A)
1596 // }
1597 return false;
1598 SDValue Ptr = Ld->getBasePtr();
1599 FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr);
1600 if (!FINode)
1601 return false;
1602 FI = FINode->getIndex();
1603 } else
1604 return false;
1605
1606 assert(FI != INT_MAX);
1607 if (!MFI->isFixedObjectIndex(FI))
1608 return false;
1609 return Offset == MFI->getObjectOffset(FI) && Bytes == MFI->getObjectSize(FI);
1610 }
1611
1612 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
1613 /// for tail call optimization. Targets which want to do tail call
1614 /// optimization should implement this function.
1615 bool
1616 ARMTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
1617 CallingConv::ID CalleeCC,
1618 bool isVarArg,
1619 bool isCalleeStructRet,
1620 bool isCallerStructRet,
1621 const SmallVectorImpl<ISD::OutputArg> &Outs,
1622 const SmallVectorImpl<SDValue> &OutVals,
1623 const SmallVectorImpl<ISD::InputArg> &Ins,
1624 SelectionDAG& DAG) const {
1625 const Function *CallerF = DAG.getMachineFunction().getFunction();
1626 CallingConv::ID CallerCC = CallerF->getCallingConv();
1627 bool CCMatch = CallerCC == CalleeCC;
1628
1629 // Look for obvious safe cases to perform tail call optimization that do not
1630 // require ABI changes. This is what gcc calls sibcall.
1631
1632 // Do not sibcall optimize vararg calls unless the call site is not passing
1633 // any arguments.
1634 if (isVarArg && !Outs.empty())
1635 return false;
1636
1637 // Also avoid sibcall optimization if either caller or callee uses struct
1638 // return semantics.
1639 if (isCalleeStructRet || isCallerStructRet)
1640 return false;
1641
1642 // FIXME: Completely disable sibcall for Thumb1 since Thumb1RegisterInfo::
1643 // emitEpilogue is not ready for them. Thumb tail calls also use t2B, as
1644 // the Thumb1 16-bit unconditional branch doesn't have sufficient relocation
1645 // support in the assembler and linker to be used. This would need to be
1646 // fixed to fully support tail calls in Thumb1.
1647 //
1648 // Doing this is tricky, since the LDM/POP instruction on Thumb doesn't take
1649 // LR. This means if we need to reload LR, it takes an extra instructions,
1650 // which outweighs the value of the tail call; but here we don't know yet
1651 // whether LR is going to be used. Probably the right approach is to
1652 // generate the tail call here and turn it back into CALL/RET in
1653 // emitEpilogue if LR is used.
1654
1655 // Thumb1 PIC calls to external symbols use BX, so they can be tail calls,
1656 // but we need to make sure there are enough registers; the only valid
1657 // registers are the 4 used for parameters. We don't currently do this
1658 // case.
1659 if (Subtarget->isThumb1Only())
1660 return false;
1661
1662 // If the calling conventions do not match, then we'd better make sure the
1663 // results are returned in the same way as what the caller expects.
1664 if (!CCMatch) {
1665 SmallVector<CCValAssign, 16> RVLocs1;
1666 ARMCCState CCInfo1(CalleeCC, false, DAG.getMachineFunction(),
1667 getTargetMachine(), RVLocs1, *DAG.getContext(), Call);
1668 CCInfo1.AnalyzeCallResult(Ins, CCAssignFnForNode(CalleeCC, true, isVarArg));
1669
1670 SmallVector<CCValAssign, 16> RVLocs2;
1671 ARMCCState CCInfo2(CallerCC, false, DAG.getMachineFunction(),
1672 getTargetMachine(), RVLocs2, *DAG.getContext(), Call);
1673 CCInfo2.AnalyzeCallResult(Ins, CCAssignFnForNode(CallerCC, true, isVarArg));
1674
1675 if (RVLocs1.size() != RVLocs2.size())
1676 return false;
1677 for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
1678 if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
1679 return false;
1680 if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
1681 return false;
1682 if (RVLocs1[i].isRegLoc()) {
1683 if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
1684 return false;
1685 } else {
1686 if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
1687 return false;
1688 }
1689 }
1690 }
1691
1692 // If the callee takes no arguments then go on to check the results of the
1693 // call.
1694 if (!Outs.empty()) {
1695 // Check if stack adjustment is needed. For now, do not do this if any
1696 // argument is passed on the stack.
1697 SmallVector<CCValAssign, 16> ArgLocs;
1698 ARMCCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(),
1699 getTargetMachine(), ArgLocs, *DAG.getContext(), Call);
1700 CCInfo.AnalyzeCallOperands(Outs,
1701 CCAssignFnForNode(CalleeCC, false, isVarArg));
1702 if (CCInfo.getNextStackOffset()) {
1703 MachineFunction &MF = DAG.getMachineFunction();
1704
1705 // Check if the arguments are already laid out in the right way as
1706 // the caller's fixed stack objects.
1707 MachineFrameInfo *MFI = MF.getFrameInfo();
1708 const MachineRegisterInfo *MRI = &MF.getRegInfo();
1709 const ARMInstrInfo *TII =
1710 ((ARMTargetMachine&)getTargetMachine()).getInstrInfo();
1711 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
1712 i != e;
1713 ++i, ++realArgIdx) {
1714 CCValAssign &VA = ArgLocs[i];
1715 EVT RegVT = VA.getLocVT();
1716 SDValue Arg = OutVals[realArgIdx];
1717 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
1718 if (VA.getLocInfo() == CCValAssign::Indirect)
1719 return false;
1720 if (VA.needsCustom()) {
1721 // f64 and vector types are split into multiple registers or
1722 // register/stack-slot combinations. The types will not match
1723 // the registers; give up on memory f64 refs until we figure
1724 // out what to do about this.
1725 if (!VA.isRegLoc())
1726 return false;
1727 if (!ArgLocs[++i].isRegLoc())
1728 return false;
1729 if (RegVT == MVT::v2f64) {
1730 if (!ArgLocs[++i].isRegLoc())
1731 return false;
1732 if (!ArgLocs[++i].isRegLoc())
1733 return false;
1734 }
1735 } else if (!VA.isRegLoc()) {
1736 if (!MatchingStackOffset(Arg, VA.getLocMemOffset(), Flags,
1737 MFI, MRI, TII))
1738 return false;
1739 }
1740 }
1741 }
1742 }
1743
1744 return true;
1745 }
1746
1747 SDValue
1748 ARMTargetLowering::LowerReturn(SDValue Chain,
1749 CallingConv::ID CallConv, bool isVarArg,
1750 const SmallVectorImpl<ISD::OutputArg> &Outs,
1751 const SmallVectorImpl<SDValue> &OutVals,
1752 DebugLoc dl, SelectionDAG &DAG) const {
1753
1754 // CCValAssign - represent the assignment of the return value to a location.
1755 SmallVector<CCValAssign, 16> RVLocs;
1756
1757 // CCState - Info about the registers and stack slots.
1758 ARMCCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1759 getTargetMachine(), RVLocs, *DAG.getContext(), Call);
1760
1761 // Analyze outgoing return values.
1762 CCInfo.AnalyzeReturn(Outs, CCAssignFnForNode(CallConv, /* Return */ true,
1763 isVarArg));
1764
1765 // If this is the first return lowered for this function, add
1766 // the regs to the liveout set for the function.
1767 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1768 for (unsigned i = 0; i != RVLocs.size(); ++i)
1769 if (RVLocs[i].isRegLoc())
1770 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1771 }
1772
1773 SDValue Flag;
1774
1775 // Copy the result values into the output registers.
1776 for (unsigned i = 0, realRVLocIdx = 0;
1777 i != RVLocs.size();
1778 ++i, ++realRVLocIdx) {
1779 CCValAssign &VA = RVLocs[i];
1780 assert(VA.isRegLoc() && "Can only return in registers!");
1781
1782 SDValue Arg = OutVals[realRVLocIdx];
1783
1784 switch (VA.getLocInfo()) {
1785 default: llvm_unreachable("Unknown loc info!");
1786 case CCValAssign::Full: break;
1787 case CCValAssign::BCvt:
1788 Arg = DAG.getNode(ISD::BITCAST, dl, VA.getLocVT(), Arg);
1789 break;
1790 }
1791
1792 if (VA.needsCustom()) {
1793 if (VA.getLocVT() == MVT::v2f64) {
1794 // Extract the first half and return it in two registers.
1795 SDValue Half = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1796 DAG.getConstant(0, MVT::i32));
1797 SDValue HalfGPRs = DAG.getNode(ARMISD::VMOVRRD, dl,
1798 DAG.getVTList(MVT::i32, MVT::i32), Half);
1799
1800 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), HalfGPRs, Flag);
1801 Flag = Chain.getValue(1);
1802 VA = RVLocs[++i]; // skip ahead to next loc
1803 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1804 HalfGPRs.getValue(1), Flag);
1805 Flag = Chain.getValue(1);
1806 VA = RVLocs[++i]; // skip ahead to next loc
1807
1808 // Extract the 2nd half and fall through to handle it as an f64 value.
1809 Arg = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1810 DAG.getConstant(1, MVT::i32));
1811 }
1812 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
1813 // available.
1814 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
1815 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
1816 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag);
1817 Flag = Chain.getValue(1);
1818 VA = RVLocs[++i]; // skip ahead to next loc
1819 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1),
1820 Flag);
1821 } else
1822 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
1823
1824 // Guarantee that all emitted copies are
1825 // stuck together, avoiding something bad.
1826 Flag = Chain.getValue(1);
1827 }
1828
1829 SDValue result;
1830 if (Flag.getNode())
1831 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
1832 else // Return Void
1833 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
1834
1835 return result;
1836 }
1837
1838 bool ARMTargetLowering::isUsedByReturnOnly(SDNode *N) const {
1839 if (N->getNumValues() != 1)
1840 return false;
1841 if (!N->hasNUsesOfValue(1, 0))
1842 return false;
1843
1844 unsigned NumCopies = 0;
1845 SDNode* Copies[2];
1846 SDNode *Use = *N->use_begin();
1847 if (Use->getOpcode() == ISD::CopyToReg) {
1848 Copies[NumCopies++] = Use;
1849 } else if (Use->getOpcode() == ARMISD::VMOVRRD) {
1850 // f64 returned in a pair of GPRs.
1851 for (SDNode::use_iterator UI = Use->use_begin(), UE = Use->use_end();
1852 UI != UE; ++UI) {
1853 if (UI->getOpcode() != ISD::CopyToReg)
1854 return false;
1855 Copies[UI.getUse().getResNo()] = *UI;
1856 ++NumCopies;
1857 }
1858 } else if (Use->getOpcode() == ISD::BITCAST) {
1859 // f32 returned in a single GPR.
1860 if (!Use->hasNUsesOfValue(1, 0))
1861 return false;
1862 Use = *Use->use_begin();
1863 if (Use->getOpcode() != ISD::CopyToReg || !Use->hasNUsesOfValue(1, 0))
1864 return false;
1865 Copies[NumCopies++] = Use;
1866 } else {
1867 return false;
1868 }
1869
1870 if (NumCopies != 1 && NumCopies != 2)
1871 return false;
1872
1873 bool HasRet = false;
1874 for (unsigned i = 0; i < NumCopies; ++i) {
1875 SDNode *Copy = Copies[i];
1876 for (SDNode::use_iterator UI = Copy->use_begin(), UE = Copy->use_end();
1877 UI != UE; ++UI) {
1878 if (UI->getOpcode() == ISD::CopyToReg) {
1879 SDNode *Use = *UI;
1880 if (Use == Copies[0] || Use == Copies[1])
1881 continue;
1882 return false;
1883 }
1884 if (UI->getOpcode() != ARMISD::RET_FLAG)
1885 return false;
1886 HasRet = true;
1887 }
1888 }
1889
1890 return HasRet;
1891 }
1892
1893 bool ARMTargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
1894 if (!EnableARMTailCalls)
1895 return false;
1896
1897 if (!CI->isTailCall())
1898 return false;
1899
1900 return !Subtarget->isThumb1Only();
1901 }
1902
1903 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
1904 // their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is
1905 // one of the above mentioned nodes. It has to be wrapped because otherwise
1906 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
1907 // be used to form addressing mode. These wrapped nodes will be selected
1908 // into MOVi.
1909 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
1910 EVT PtrVT = Op.getValueType();
1911 // FIXME there is no actual debug info here
1912 DebugLoc dl = Op.getDebugLoc();
1913 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1914 SDValue Res;
1915 if (CP->isMachineConstantPoolEntry())
1916 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
1917 CP->getAlignment());
1918 else
1919 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
1920 CP->getAlignment());
1921 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
1922 }
1923
1924 unsigned ARMTargetLowering::getJumpTableEncoding() const {
1925 return MachineJumpTableInfo::EK_Inline;
1926 }
1927
1928 SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op,
1929 SelectionDAG &DAG) const {
1930 MachineFunction &MF = DAG.getMachineFunction();
1931 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1932 unsigned ARMPCLabelIndex = 0;
1933 DebugLoc DL = Op.getDebugLoc();
1934 EVT PtrVT = getPointerTy();
1935 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1936 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1937 SDValue CPAddr;
1938 if (RelocM == Reloc::Static) {
1939 CPAddr = DAG.getTargetConstantPool(BA, PtrVT, 4);
1940 } else {
1941 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1942 ARMPCLabelIndex = AFI->createPICLabelUId();
1943 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(BA, ARMPCLabelIndex,
1944 ARMCP::CPBlockAddress,
1945 PCAdj);
1946 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1947 }
1948 CPAddr = DAG.getNode(ARMISD::Wrapper, DL, PtrVT, CPAddr);
1949 SDValue Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), CPAddr,
1950 MachinePointerInfo::getConstantPool(),
1951 false, false, 0);
1952 if (RelocM == Reloc::Static)
1953 return Result;
1954 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1955 return DAG.getNode(ARMISD::PIC_ADD, DL, PtrVT, Result, PICLabel);
1956 }
1957
1958 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
1959 SDValue
1960 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
1961 SelectionDAG &DAG) const {
1962 DebugLoc dl = GA->getDebugLoc();
1963 EVT PtrVT = getPointerTy();
1964 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1965 MachineFunction &MF = DAG.getMachineFunction();
1966 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1967 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
1968 ARMConstantPoolValue *CPV =
1969 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1970 ARMCP::CPValue, PCAdj, ARMCP::TLSGD, true);
1971 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1972 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
1973 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument,
1974 MachinePointerInfo::getConstantPool(),
1975 false, false, 0);
1976 SDValue Chain = Argument.getValue(1);
1977
1978 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1979 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
1980
1981 // call __tls_get_addr.
1982 ArgListTy Args;
1983 ArgListEntry Entry;
1984 Entry.Node = Argument;
1985 Entry.Ty = (const Type *) Type::getInt32Ty(*DAG.getContext());
1986 Args.push_back(Entry);
1987 // FIXME: is there useful debug info available here?
1988 std::pair<SDValue, SDValue> CallResult =
1989 LowerCallTo(Chain, (const Type *) Type::getInt32Ty(*DAG.getContext()),
1990 false, false, false, false,
1991 0, CallingConv::C, false, /*isReturnValueUsed=*/true,
1992 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
1993 return CallResult.first;
1994 }
1995
1996 // Lower ISD::GlobalTLSAddress using the "initial exec" or
1997 // "local exec" model.
1998 SDValue
1999 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
2000 SelectionDAG &DAG) const {
2001 const GlobalValue *GV = GA->getGlobal();
2002 DebugLoc dl = GA->getDebugLoc();
2003 SDValue Offset;
2004 SDValue Chain = DAG.getEntryNode();
2005 EVT PtrVT = getPointerTy();
2006 // Get the Thread Pointer
2007 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
2008
2009 if (GV->isDeclaration()) {
2010 MachineFunction &MF = DAG.getMachineFunction();
2011 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2012 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
2013 // Initial exec model.
2014 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
2015 ARMConstantPoolValue *CPV =
2016 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
2017 ARMCP::CPValue, PCAdj, ARMCP::GOTTPOFF, true);
2018 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
2019 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
2020 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
2021 MachinePointerInfo::getConstantPool(),
2022 false, false, 0);
2023 Chain = Offset.getValue(1);
2024
2025 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
2026 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
2027
2028 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
2029 MachinePointerInfo::getConstantPool(),
2030 false, false, 0);
2031 } else {
2032 // local exec model
2033 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMCP::TPOFF);
2034 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
2035 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
2036 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
2037 MachinePointerInfo::getConstantPool(),
2038 false, false, 0);
2039 }
2040
2041 // The address of the thread local variable is the add of the thread
2042 // pointer with the offset of the variable.
2043 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
2044 }
2045
2046 SDValue
2047 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
2048 // TODO: implement the "local dynamic" model
2049 assert(Subtarget->isTargetELF() &&
2050 "TLS not implemented for non-ELF targets");
2051 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
2052 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
2053 // otherwise use the "Local Exec" TLS Model
2054 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
2055 return LowerToTLSGeneralDynamicModel(GA, DAG);
2056 else
2057 return LowerToTLSExecModels(GA, DAG);
2058 }
2059
2060 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
2061 SelectionDAG &DAG) const {
2062 EVT PtrVT = getPointerTy();
2063 DebugLoc dl = Op.getDebugLoc();
2064 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
2065 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
2066 if (RelocM == Reloc::PIC_) {
2067 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
2068 ARMConstantPoolValue *CPV =
2069 new ARMConstantPoolValue(GV, UseGOTOFF ? ARMCP::GOTOFF : ARMCP::GOT);
2070 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
2071 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
2072 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
2073 CPAddr,
2074 MachinePointerInfo::getConstantPool(),
2075 false, false, 0);
2076 SDValue Chain = Result.getValue(1);
2077 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
2078 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
2079 if (!UseGOTOFF)
2080 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
2081 MachinePointerInfo::getGOT(), false, false, 0);
2082 return Result;
2083 }
2084
2085 // If we have T2 ops, we can materialize the address directly via movt/movw
2086 // pair. This is always cheaper.
2087 if (Subtarget->useMovt()) {
2088 ++NumMovwMovt;
2089 // FIXME: Once remat is capable of dealing with instructions with register
2090 // operands, expand this into two nodes.
2091 return DAG.getNode(ARMISD::Wrapper, dl, PtrVT,
2092 DAG.getTargetGlobalAddress(GV, dl, PtrVT));
2093 } else {
2094 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
2095 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
2096 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
2097 MachinePointerInfo::getConstantPool(),
2098 false, false, 0);
2099 }
2100 }
2101
2102 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
2103 SelectionDAG &DAG) const {
2104 EVT PtrVT = getPointerTy();
2105 DebugLoc dl = Op.getDebugLoc();
2106 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
2107 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
2108 MachineFunction &MF = DAG.getMachineFunction();
2109 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2110
2111 // FIXME: Enable this for static codegen when tool issues are fixed.
2112 if (Subtarget->useMovt() && RelocM != Reloc::Static) {
2113 ++NumMovwMovt;
2114 // FIXME: Once remat is capable of dealing with instructions with register
2115 // operands, expand this into two nodes.
2116 if (RelocM == Reloc::Static)
2117 return DAG.getNode(ARMISD::Wrapper, dl, PtrVT,
2118 DAG.getTargetGlobalAddress(GV, dl, PtrVT));
2119
2120 unsigned Wrapper = (RelocM == Reloc::PIC_)
2121 ? ARMISD::WrapperPIC : ARMISD::WrapperDYN;
2122 SDValue Result = DAG.getNode(Wrapper, dl, PtrVT,
2123 DAG.getTargetGlobalAddress(GV, dl, PtrVT));
2124 if (Subtarget->GVIsIndirectSymbol(GV, RelocM))
2125 Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Result,
2126 MachinePointerInfo::getGOT(), false, false, 0);
2127 return Result;
2128 }
2129
2130 unsigned ARMPCLabelIndex = 0;
2131 SDValue CPAddr;
2132 if (RelocM == Reloc::Static) {
2133 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
2134 } else {
2135 ARMPCLabelIndex = AFI->createPICLabelUId();
2136 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb()?4:8);
2137 ARMConstantPoolValue *CPV =
2138 new ARMConstantPoolValue(GV, ARMPCLabelIndex, ARMCP::CPValue, PCAdj);
2139 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
2140 }
2141 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
2142
2143 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
2144 MachinePointerInfo::getConstantPool(),
2145 false, false, 0);
2146 SDValue Chain = Result.getValue(1);
2147
2148 if (RelocM == Reloc::PIC_) {
2149 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
2150 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
2151 }
2152
2153 if (Subtarget->GVIsIndirectSymbol(GV, RelocM))
2154 Result = DAG.getLoad(PtrVT, dl, Chain, Result, MachinePointerInfo::getGOT(),
2155 false, false, 0);
2156
2157 return Result;
2158 }
2159
2160 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
2161 SelectionDAG &DAG) const {
2162 assert(Subtarget->isTargetELF() &&
2163 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
2164 MachineFunction &MF = DAG.getMachineFunction();
2165 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2166 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
2167 EVT PtrVT = getPointerTy();
2168 DebugLoc dl = Op.getDebugLoc();
2169 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
2170 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
2171 "_GLOBAL_OFFSET_TABLE_",
2172 ARMPCLabelIndex, PCAdj);
2173 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
2174 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
2175 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
2176 MachinePointerInfo::getConstantPool(),
2177 false, false, 0);
2178 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
2179 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
2180 }
2181
2182 SDValue
2183 ARMTargetLowering::LowerEH_SJLJ_DISPATCHSETUP(SDValue Op, SelectionDAG &DAG)
2184 const {
2185 DebugLoc dl = Op.getDebugLoc();
2186 return DAG.getNode(ARMISD::EH_SJLJ_DISPATCHSETUP, dl, MVT::Other,
2187 Op.getOperand(0), Op.getOperand(1));
2188 }
2189
2190 SDValue
2191 ARMTargetLowering::LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const {
2192 DebugLoc dl = Op.getDebugLoc();
2193 SDValue Val = DAG.getConstant(0, MVT::i32);
2194 return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, MVT::i32, Op.getOperand(0),
2195 Op.getOperand(1), Val);
2196 }
2197
2198 SDValue
2199 ARMTargetLowering::LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const {
2200 DebugLoc dl = Op.getDebugLoc();
2201 return DAG.getNode(ARMISD::EH_SJLJ_LONGJMP, dl, MVT::Other, Op.getOperand(0),
2202 Op.getOperand(1), DAG.getConstant(0, MVT::i32));
2203 }
2204
2205 SDValue
2206 ARMTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
2207 const ARMSubtarget *Subtarget) const {
2208 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
2209 DebugLoc dl = Op.getDebugLoc();
2210 switch (IntNo) {
2211 default: return SDValue(); // Don't custom lower most intrinsics.
2212 case Intrinsic::arm_thread_pointer: {
2213 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2214 return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
2215 }
2216 case Intrinsic::eh_sjlj_lsda: {
2217 MachineFunction &MF = DAG.getMachineFunction();
2218 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2219 unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
2220 EVT PtrVT = getPointerTy();
2221 DebugLoc dl = Op.getDebugLoc();
2222 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
2223 SDValue CPAddr;
2224 unsigned PCAdj = (RelocM != Reloc::PIC_)
2225 ? 0 : (Subtarget->isThumb() ? 4 : 8);
2226 ARMConstantPoolValue *CPV =
2227 new ARMConstantPoolValue(MF.getFunction(), ARMPCLabelIndex,
2228 ARMCP::CPLSDA, PCAdj);
2229 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
2230 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
2231 SDValue Result =
2232 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
2233 MachinePointerInfo::getConstantPool(),
2234 false, false, 0);
2235
2236 if (RelocM == Reloc::PIC_) {
2237 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
2238 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
2239 }
2240 return Result;
2241 }
2242 case Intrinsic::arm_neon_vmulls:
2243 case Intrinsic::arm_neon_vmullu: {
2244 unsigned NewOpc = (IntNo == Intrinsic::arm_neon_vmulls)
2245 ? ARMISD::VMULLs : ARMISD::VMULLu;
2246 return DAG.getNode(NewOpc, Op.getDebugLoc(), Op.getValueType(),
2247 Op.getOperand(1), Op.getOperand(2));
2248 }
2249 }
2250 }
2251
2252 static SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG,
2253 const ARMSubtarget *Subtarget) {
2254 DebugLoc dl = Op.getDebugLoc();
2255 if (!Subtarget->hasDataBarrier()) {
2256 // Some ARMv6 cpus can support data barriers with an mcr instruction.
2257 // Thumb1 and pre-v6 ARM mode use a libcall instead and should never get
2258 // here.
2259 assert(Subtarget->hasV6Ops() && !Subtarget->isThumb() &&
2260 "Unexpected ISD::MEMBARRIER encountered. Should be libcall!");
2261 return DAG.getNode(ARMISD::MEMBARRIER_MCR, dl, MVT::Other, Op.getOperand(0),
2262 DAG.getConstant(0, MVT::i32));
2263 }
2264
2265 SDValue Op5 = Op.getOperand(5);
2266 bool isDeviceBarrier = cast<ConstantSDNode>(Op5)->getZExtValue() != 0;
2267 unsigned isLL = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
2268 unsigned isLS = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
2269 bool isOnlyStoreBarrier = (isLL == 0 && isLS == 0);
2270
2271 ARM_MB::MemBOpt DMBOpt;
2272 if (isDeviceBarrier)
2273 DMBOpt = isOnlyStoreBarrier ? ARM_MB::ST : ARM_MB::SY;
2274 else
2275 DMBOpt = isOnlyStoreBarrier ? ARM_MB::ISHST : ARM_MB::ISH;
2276 return DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0),
2277 DAG.getConstant(DMBOpt, MVT::i32));
2278 }
2279
2280 static SDValue LowerPREFETCH(SDValue Op, SelectionDAG &DAG,
2281 const ARMSubtarget *Subtarget) {
2282 // ARM pre v5TE and Thumb1 does not have preload instructions.
2283 if (!(Subtarget->isThumb2() ||
2284 (!Subtarget->isThumb1Only() && Subtarget->hasV5TEOps())))
2285 // Just preserve the chain.
2286 return Op.getOperand(0);
2287
2288 DebugLoc dl = Op.getDebugLoc();
2289 unsigned isRead = ~cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() & 1;
2290 if (!isRead &&
2291 (!Subtarget->hasV7Ops() || !Subtarget->hasMPExtension()))
2292 // ARMv7 with MP extension has PLDW.
2293 return Op.getOperand(0);
2294
2295 unsigned isData = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
2296 if (Subtarget->isThumb()) {
2297 // Invert the bits.
2298 isRead = ~isRead & 1;
2299 isData = ~isData & 1;
2300 }
2301
2302 return DAG.getNode(ARMISD::PRELOAD, dl, MVT::Other, Op.getOperand(0),
2303 Op.getOperand(1), DAG.getConstant(isRead, MVT::i32),
2304 DAG.getConstant(isData, MVT::i32));
2305 }
2306
2307 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) {
2308 MachineFunction &MF = DAG.getMachineFunction();
2309 ARMFunctionInfo *FuncInfo = MF.getInfo<ARMFunctionInfo>();
2310
2311 // vastart just stores the address of the VarArgsFrameIndex slot into the
2312 // memory location argument.
2313 DebugLoc dl = Op.getDebugLoc();
2314 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2315 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
2316 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
2317 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1),
2318 MachinePointerInfo(SV), false, false, 0);
2319 }
2320
2321 SDValue
2322 ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
2323 SDValue &Root, SelectionDAG &DAG,
2324 DebugLoc dl) const {
2325 MachineFunction &MF = DAG.getMachineFunction();
2326 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2327
2328 TargetRegisterClass *RC;
2329 if (AFI->isThumb1OnlyFunction())
2330 RC = ARM::tGPRRegisterClass;
2331 else
2332 RC = ARM::GPRRegisterClass;
2333
2334 // Transform the arguments stored in physical registers into virtual ones.
2335 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2336 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
2337
2338 SDValue ArgValue2;
2339 if (NextVA.isMemLoc()) {
2340 MachineFrameInfo *MFI = MF.getFrameInfo();
2341 int FI = MFI->CreateFixedObject(4, NextVA.getLocMemOffset(), true);
2342
2343 // Create load node to retrieve arguments from the stack.
2344 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2345 ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN,
2346 MachinePointerInfo::getFixedStack(FI),
2347 false, false, 0);
2348 } else {
2349 Reg = MF.addLiveIn(NextVA.getLocReg(), RC);
2350 ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
2351 }
2352
2353 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, ArgValue, ArgValue2);
2354 }
2355
2356 void
2357 ARMTargetLowering::computeRegArea(CCState &CCInfo, MachineFunction &MF,
2358 unsigned &VARegSize, unsigned &VARegSaveSize)
2359 const {
2360 unsigned NumGPRs;
2361 if (CCInfo.isFirstByValRegValid())
2362 NumGPRs = ARM::R4 - CCInfo.getFirstByValReg();
2363 else {
2364 unsigned int firstUnalloced;
2365 firstUnalloced = CCInfo.getFirstUnallocated(GPRArgRegs,
2366 sizeof(GPRArgRegs) /
2367 sizeof(GPRArgRegs[0]));
2368 NumGPRs = (firstUnalloced <= 3) ? (4 - firstUnalloced) : 0;
2369 }
2370
2371 unsigned Align = MF.getTarget().getFrameLowering()->getStackAlignment();
2372 VARegSize = NumGPRs * 4;
2373 VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
2374 }
2375
2376 // The remaining GPRs hold either the beginning of variable-argument
2377 // data, or the beginning of an aggregate passed by value (usuall
2378 // byval). Either way, we allocate stack slots adjacent to the data
2379 // provided by our caller, and store the unallocated registers there.
2380 // If this is a variadic function, the va_list pointer will begin with
2381 // these values; otherwise, this reassembles a (byval) structure that
2382 // was split between registers and memory.
2383 void
2384 ARMTargetLowering::VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
2385 DebugLoc dl, SDValue &Chain,
2386 unsigned ArgOffset) const {
2387 MachineFunction &MF = DAG.getMachineFunction();
2388 MachineFrameInfo *MFI = MF.getFrameInfo();
2389 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2390 unsigned firstRegToSaveIndex;
2391 if (CCInfo.isFirstByValRegValid())
2392 firstRegToSaveIndex = CCInfo.getFirstByValReg() - ARM::R0;
2393 else {
2394 firstRegToSaveIndex = CCInfo.getFirstUnallocated
2395 (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
2396 }
2397
2398 unsigned VARegSize, VARegSaveSize;
2399 computeRegArea(CCInfo, MF, VARegSize, VARegSaveSize);
2400 if (VARegSaveSize) {
2401 // If this function is vararg, store any remaining integer argument regs
2402 // to their spots on the stack so that they may be loaded by deferencing
2403 // the result of va_next.
2404 AFI->setVarArgsRegSaveSize(VARegSaveSize);
2405 AFI->setVarArgsFrameIndex(MFI->CreateFixedObject(VARegSaveSize,
2406 ArgOffset + VARegSaveSize
2407 - VARegSize,
2408 false));
2409 SDValue FIN = DAG.getFrameIndex(AFI->getVarArgsFrameIndex(),
2410 getPointerTy());
2411
2412 SmallVector<SDValue, 4> MemOps;
2413 for (; firstRegToSaveIndex < 4; ++firstRegToSaveIndex) {
2414 TargetRegisterClass *RC;
2415 if (AFI->isThumb1OnlyFunction())
2416 RC = ARM::tGPRRegisterClass;
2417 else
2418 RC = ARM::GPRRegisterClass;
2419
2420 unsigned VReg = MF.addLiveIn(GPRArgRegs[firstRegToSaveIndex], RC);
2421 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
2422 SDValue Store =
2423 DAG.getStore(Val.getValue(1), dl, Val, FIN,
2424 MachinePointerInfo::getFixedStack(AFI->getVarArgsFrameIndex()),
2425 false, false, 0);
2426 MemOps.push_back(Store);
2427 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
2428 DAG.getConstant(4, getPointerTy()));
2429 }
2430 if (!MemOps.empty())
2431 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
2432 &MemOps[0], MemOps.size());
2433 } else
2434 // This will point to the next argument passed via stack.
2435 AFI->setVarArgsFrameIndex(MFI->CreateFixedObject(4, ArgOffset, true));
2436 }
2437
2438 SDValue
2439 ARMTargetLowering::LowerFormalArguments(SDValue Chain,
2440 CallingConv::ID CallConv, bool isVarArg,
2441 const SmallVectorImpl<ISD::InputArg>
2442 &Ins,
2443 DebugLoc dl, SelectionDAG &DAG,
2444 SmallVectorImpl<SDValue> &InVals)
2445 const {
2446 MachineFunction &MF = DAG.getMachineFunction();
2447 MachineFrameInfo *MFI = MF.getFrameInfo();
2448
2449 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2450
2451 // Assign locations to all of the incoming arguments.
2452 SmallVector<CCValAssign, 16> ArgLocs;
2453 ARMCCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
2454 getTargetMachine(), ArgLocs, *DAG.getContext(), Prologue);
2455 CCInfo.AnalyzeFormalArguments(Ins,
2456 CCAssignFnForNode(CallConv, /* Return*/ false,
2457 isVarArg));
2458
2459 SmallVector<SDValue, 16> ArgValues;
2460 int lastInsIndex = -1;
2461
2462 SDValue ArgValue;
2463 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2464 CCValAssign &VA = ArgLocs[i];
2465
2466 // Arguments stored in registers.
2467 if (VA.isRegLoc()) {
2468 EVT RegVT = VA.getLocVT();
2469
2470 if (VA.needsCustom()) {
2471 // f64 and vector types are split up into multiple registers or
2472 // combinations of registers and stack slots.
2473 if (VA.getLocVT() == MVT::v2f64) {
2474 SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i],
2475 Chain, DAG, dl);
2476 VA = ArgLocs[++i]; // skip ahead to next loc
2477 SDValue ArgValue2;
2478 if (VA.isMemLoc()) {
2479 int FI = MFI->CreateFixedObject(8, VA.getLocMemOffset(), true);
2480 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2481 ArgValue2 = DAG.getLoad(MVT::f64, dl, Chain, FIN,
2482 MachinePointerInfo::getFixedStack(FI),
2483 false, false, 0);
2484 } else {
2485 ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
2486 Chain, DAG, dl);
2487 }
2488 ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
2489 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
2490 ArgValue, ArgValue1, DAG.getIntPtrConstant(0));
2491 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
2492 ArgValue, ArgValue2, DAG.getIntPtrConstant(1));
2493 } else
2494 ArgValue = GetF64FormalArgument(VA, ArgLocs[++i], Chain, DAG, dl);
2495
2496 } else {
2497 TargetRegisterClass *RC;
2498
2499 if (RegVT == MVT::f32)
2500 RC = ARM::SPRRegisterClass;
2501 else if (RegVT == MVT::f64)
2502 RC = ARM::DPRRegisterClass;
2503 else if (RegVT == MVT::v2f64)
2504 RC = ARM::QPRRegisterClass;
2505 else if (RegVT == MVT::i32)
2506 RC = (AFI->isThumb1OnlyFunction() ?
2507 ARM::tGPRRegisterClass : ARM::GPRRegisterClass);
2508 else
2509 llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
2510
2511 // Transform the arguments in physical registers into virtual ones.
2512 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2513 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
2514 }
2515
2516 // If this is an 8 or 16-bit value, it is really passed promoted
2517 // to 32 bits. Insert an assert[sz]ext to capture this, then
2518 // truncate to the right size.
2519 switch (VA.getLocInfo()) {
2520 default: llvm_unreachable("Unknown loc info!");
2521 case CCValAssign::Full: break;
2522 case CCValAssign::BCvt:
2523 ArgValue = DAG.getNode(ISD::BITCAST, dl, VA.getValVT(), ArgValue);
2524 break;
2525 case CCValAssign::SExt:
2526 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
2527 DAG.getValueType(VA.getValVT()));
2528 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2529 break;
2530 case CCValAssign::ZExt:
2531 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
2532 DAG.getValueType(VA.getValVT()));
2533 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2534 break;
2535 }
2536
2537 InVals.push_back(ArgValue);
2538
2539 } else { // VA.isRegLoc()
2540
2541 // sanity check
2542 assert(VA.isMemLoc());
2543 assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered");
2544
2545 int index = ArgLocs[i].getValNo();
2546
2547 // Some Ins[] entries become multiple ArgLoc[] entries.
2548 // Process them only once.
2549 if (index != lastInsIndex)
2550 {
2551 ISD::ArgFlagsTy Flags = Ins[index].Flags;
2552 // FIXME: For now, all byval parameter objects are marked mutable.
2553 // This can be changed with more analysis.
2554 // In case of tail call optimization mark all arguments mutable.
2555 // Since they could be overwritten by lowering of arguments in case of
2556 // a tail call.
2557 if (Flags.isByVal()) {
2558 unsigned VARegSize, VARegSaveSize;
2559 computeRegArea(CCInfo, MF, VARegSize, VARegSaveSize);
2560 VarArgStyleRegisters(CCInfo, DAG, dl, Chain, 0);
2561 unsigned Bytes = Flags.getByValSize() - VARegSize;
2562 if (Bytes == 0) Bytes = 1; // Don't create zero-sized stack objects.
2563 int FI = MFI->CreateFixedObject(Bytes,
2564 VA.getLocMemOffset(), false);
2565 InVals.push_back(DAG.getFrameIndex(FI, getPointerTy()));
2566 } else {
2567 int FI = MFI->CreateFixedObject(VA.getLocVT().getSizeInBits()/8,
2568 VA.getLocMemOffset(), true);
2569
2570 // Create load nodes to retrieve arguments from the stack.
2571 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2572 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
2573 MachinePointerInfo::getFixedStack(FI),
2574 false, false, 0));
2575 }
2576 lastInsIndex = index;
2577 }
2578 }
2579 }
2580
2581 // varargs
2582 if (isVarArg)
2583 VarArgStyleRegisters(CCInfo, DAG, dl, Chain, CCInfo.getNextStackOffset());
2584
2585 return Chain;
2586 }
2587
2588 /// isFloatingPointZero - Return true if this is +0.0.
2589 static bool isFloatingPointZero(SDValue Op) {
2590 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
2591 return CFP->getValueAPF().isPosZero();
2592 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
2593 // Maybe this has already been legalized into the constant pool?
2594 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
2595 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
2596 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
2597 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
2598 return CFP->getValueAPF().isPosZero();
2599 }
2600 }
2601 return false;
2602 }
2603
2604 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
2605 /// the given operands.
2606 SDValue
2607 ARMTargetLowering::getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
2608 SDValue &ARMcc, SelectionDAG &DAG,
2609 DebugLoc dl) const {
2610 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
2611 unsigned C = RHSC->getZExtValue();
2612 if (!isLegalICmpImmediate(C)) {
2613 // Constant does not fit, try adjusting it by one?
2614 switch (CC) {
2615 default: break;
2616 case ISD::SETLT:
2617 case ISD::SETGE:
2618 if (C != 0x80000000 && isLegalICmpImmediate(C-1)) {
2619 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
2620 RHS = DAG.getConstant(C-1, MVT::i32);
2621 }
2622 break;
2623 case ISD::SETULT:
2624 case ISD::SETUGE:
2625 if (C != 0 && isLegalICmpImmediate(C-1)) {
2626 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
2627 RHS = DAG.getConstant(C-1, MVT::i32);
2628 }
2629 break;
2630 case ISD::SETLE:
2631 case ISD::SETGT:
2632 if (C != 0x7fffffff && isLegalICmpImmediate(C+1)) {
2633 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
2634 RHS = DAG.getConstant(C+1, MVT::i32);
2635 }
2636 break;
2637 case ISD::SETULE:
2638 case ISD::SETUGT:
2639 if (C != 0xffffffff && isLegalICmpImmediate(C+1)) {
2640 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
2641 RHS = DAG.getConstant(C+1, MVT::i32);
2642 }
2643 break;
2644 }
2645 }
2646 }
2647
2648 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
2649 ARMISD::NodeType CompareType;
2650 switch (CondCode) {
2651 default:
2652 CompareType = ARMISD::CMP;
2653 break;
2654 case ARMCC::EQ:
2655 case ARMCC::NE:
2656 // Uses only Z Flag
2657 CompareType = ARMISD::CMPZ;
2658 break;
2659 }
2660 ARMcc = DAG.getConstant(CondCode, MVT::i32);
2661 return DAG.getNode(CompareType, dl, MVT::Glue, LHS, RHS);
2662 }
2663
2664 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
2665 SDValue
2666 ARMTargetLowering::getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
2667 DebugLoc dl) const {
2668 SDValue Cmp;
2669 if (!isFloatingPointZero(RHS))
2670 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Glue, LHS, RHS);
2671 else
2672 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Glue, LHS);
2673 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Glue, Cmp);
2674 }
2675
2676 /// duplicateCmp - Glue values can have only one use, so this function
2677 /// duplicates a comparison node.
2678 SDValue
2679 ARMTargetLowering::duplicateCmp(SDValue Cmp, SelectionDAG &DAG) const {
2680 unsigned Opc = Cmp.getOpcode();
2681 DebugLoc DL = Cmp.getDebugLoc();
2682 if (Opc == ARMISD::CMP || Opc == ARMISD::CMPZ)
2683 return DAG.getNode(Opc, DL, MVT::Glue, Cmp.getOperand(0),Cmp.getOperand(1));
2684
2685 assert(Opc == ARMISD::FMSTAT && "unexpected comparison operation");
2686 Cmp = Cmp.getOperand(0);
2687 Opc = Cmp.getOpcode();
2688 if (Opc == ARMISD::CMPFP)
2689 Cmp = DAG.getNode(Opc, DL, MVT::Glue, Cmp.getOperand(0),Cmp.getOperand(1));
2690 else {
2691 assert(Opc == ARMISD::CMPFPw0 && "unexpected operand of FMSTAT");
2692 Cmp = DAG.getNode(Opc, DL, MVT::Glue, Cmp.getOperand(0));
2693 }
2694 return DAG.getNode(ARMISD::FMSTAT, DL, MVT::Glue, Cmp);
2695 }
2696
2697 SDValue ARMTargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
2698 SDValue Cond = Op.getOperand(0);
2699 SDValue SelectTrue = Op.getOperand(1);
2700 SDValue SelectFalse = Op.getOperand(2);
2701 DebugLoc dl = Op.getDebugLoc();
2702
2703 // Convert:
2704 //
2705 // (select (cmov 1, 0, cond), t, f) -> (cmov t, f, cond)
2706 // (select (cmov 0, 1, cond), t, f) -> (cmov f, t, cond)
2707 //
2708 if (Cond.getOpcode() == ARMISD::CMOV && Cond.hasOneUse()) {
2709 const ConstantSDNode *CMOVTrue =
2710 dyn_cast<ConstantSDNode>(Cond.getOperand(0));
2711 const ConstantSDNode *CMOVFalse =
2712 dyn_cast<ConstantSDNode>(Cond.getOperand(1));
2713
2714 if (CMOVTrue && CMOVFalse) {
2715 unsigned CMOVTrueVal = CMOVTrue->getZExtValue();
2716 unsigned CMOVFalseVal = CMOVFalse->getZExtValue();
2717
2718 SDValue True;
2719 SDValue False;
2720 if (CMOVTrueVal == 1 && CMOVFalseVal == 0) {
2721 True = SelectTrue;
2722 False = SelectFalse;
2723 } else if (CMOVTrueVal == 0 && CMOVFalseVal == 1) {
2724 True = SelectFalse;
2725 False = SelectTrue;
2726 }
2727
2728 if (True.getNode() && False.getNode()) {
2729 EVT VT = Op.getValueType();
2730 SDValue ARMcc = Cond.getOperand(2);
2731 SDValue CCR = Cond.getOperand(3);
2732 SDValue Cmp = duplicateCmp(Cond.getOperand(4), DAG);
2733 assert(True.getValueType() == VT);
2734 return DAG.getNode(ARMISD::CMOV, dl, VT, True, False, ARMcc, CCR, Cmp);
2735 }
2736 }
2737 }
2738
2739 return DAG.getSelectCC(dl, Cond,
2740 DAG.getConstant(0, Cond.getValueType()),
2741 SelectTrue, SelectFalse, ISD::SETNE);
2742 }
2743
2744 SDValue ARMTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
2745 EVT VT = Op.getValueType();
2746 SDValue LHS = Op.getOperand(0);
2747 SDValue RHS = Op.getOperand(1);
2748 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
2749 SDValue TrueVal = Op.getOperand(2);
2750 SDValue FalseVal = Op.getOperand(3);
2751 DebugLoc dl = Op.getDebugLoc();
2752
2753 if (LHS.getValueType() == MVT::i32) {
2754 SDValue ARMcc;
2755 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2756 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMcc, DAG, dl);
2757 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMcc, CCR,Cmp);
2758 }
2759
2760 ARMCC::CondCodes CondCode, CondCode2;
2761 FPCCToARMCC(CC, CondCode, CondCode2);
2762
2763 SDValue ARMcc = DAG.getConstant(CondCode, MVT::i32);
2764 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
2765 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2766 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
2767 ARMcc, CCR, Cmp);
2768 if (CondCode2 != ARMCC::AL) {
2769 SDValue ARMcc2 = DAG.getConstant(CondCode2, MVT::i32);
2770 // FIXME: Needs another CMP because flag can have but one use.
2771 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
2772 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
2773 Result, TrueVal, ARMcc2, CCR, Cmp2);
2774 }
2775 return Result;
2776 }
2777
2778 /// canChangeToInt - Given the fp compare operand, return true if it is suitable
2779 /// to morph to an integer compare sequence.
2780 static bool canChangeToInt(SDValue Op, bool &SeenZero,
2781 const ARMSubtarget *Subtarget) {
2782 SDNode *N = Op.getNode();
2783 if (!N->hasOneUse())
2784 // Otherwise it requires moving the value from fp to integer registers.
2785 return false;
2786 if (!N->getNumValues())
2787 return false;
2788 EVT VT = Op.getValueType();
2789 if (VT != MVT::f32 && !Subtarget->isFPBrccSlow())
2790 // f32 case is generally profitable. f64 case only makes sense when vcmpe +
2791 // vmrs are very slow, e.g. cortex-a8.
2792 return false;
2793
2794 if (isFloatingPointZero(Op)) {
2795 SeenZero = true;
2796 return true;
2797 }
2798 return ISD::isNormalLoad(N);
2799 }
2800
2801 static SDValue bitcastf32Toi32(SDValue Op, SelectionDAG &DAG) {
2802 if (isFloatingPointZero(Op))
2803 return DAG.getConstant(0, MVT::i32);
2804
2805 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Op))
2806 return DAG.getLoad(MVT::i32, Op.getDebugLoc(),
2807 Ld->getChain(), Ld->getBasePtr(), Ld->getPointerInfo(),
2808 Ld->isVolatile(), Ld->isNonTemporal(),
2809 Ld->getAlignment());
2810
2811 llvm_unreachable("Unknown VFP cmp argument!");
2812 }
2813
2814 static void expandf64Toi32(SDValue Op, SelectionDAG &DAG,
2815 SDValue &RetVal1, SDValue &RetVal2) {
2816 if (isFloatingPointZero(Op)) {
2817 RetVal1 = DAG.getConstant(0, MVT::i32);
2818 RetVal2 = DAG.getConstant(0, MVT::i32);
2819 return;
2820 }
2821
2822 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Op)) {
2823 SDValue Ptr = Ld->getBasePtr();
2824 RetVal1 = DAG.getLoad(MVT::i32, Op.getDebugLoc(),
2825 Ld->getChain(), Ptr,
2826 Ld->getPointerInfo(),
2827 Ld->isVolatile(), Ld->isNonTemporal(),
2828 Ld->getAlignment());
2829
2830 EVT PtrType = Ptr.getValueType();
2831 unsigned NewAlign = MinAlign(Ld->getAlignment(), 4);
2832 SDValue NewPtr = DAG.getNode(ISD::ADD, Op.getDebugLoc(),
2833 PtrType, Ptr, DAG.getConstant(4, PtrType));
2834 RetVal2 = DAG.getLoad(MVT::i32, Op.getDebugLoc(),
2835 Ld->getChain(), NewPtr,
2836 Ld->getPointerInfo().getWithOffset(4),
2837 Ld->isVolatile(), Ld->isNonTemporal(),
2838 NewAlign);
2839 return;
2840 }
2841
2842 llvm_unreachable("Unknown VFP cmp argument!");
2843 }
2844
2845 /// OptimizeVFPBrcond - With -enable-unsafe-fp-math, it's legal to optimize some
2846 /// f32 and even f64 comparisons to integer ones.
2847 SDValue
2848 ARMTargetLowering::OptimizeVFPBrcond(SDValue Op, SelectionDAG &DAG) const {
2849 SDValue Chain = Op.getOperand(0);
2850 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
2851 SDValue LHS = Op.getOperand(2);
2852 SDValue RHS = Op.getOperand(3);
2853 SDValue Dest = Op.getOperand(4);
2854 DebugLoc dl = Op.getDebugLoc();
2855
2856 bool SeenZero = false;
2857 if (canChangeToInt(LHS, SeenZero, Subtarget) &&
2858 canChangeToInt(RHS, SeenZero, Subtarget) &&
2859 // If one of the operand is zero, it's safe to ignore the NaN case since
2860 // we only care about equality comparisons.
2861 (SeenZero || (DAG.isKnownNeverNaN(LHS) && DAG.isKnownNeverNaN(RHS)))) {
2862 // If unsafe fp math optimization is enabled and there are no other uses of
2863 // the CMP operands, and the condition code is EQ or NE, we can optimize it
2864 // to an integer comparison.
2865 if (CC == ISD::SETOEQ)
2866 CC = ISD::SETEQ;
2867 else if (CC == ISD::SETUNE)
2868 CC = ISD::SETNE;
2869
2870 SDValue ARMcc;
2871 if (LHS.getValueType() == MVT::f32) {
2872 LHS = bitcastf32Toi32(LHS, DAG);
2873 RHS = bitcastf32Toi32(RHS, DAG);
2874 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMcc, DAG, dl);
2875 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2876 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
2877 Chain, Dest, ARMcc, CCR, Cmp);
2878 }
2879
2880 SDValue LHS1, LHS2;
2881 SDValue RHS1, RHS2;
2882 expandf64Toi32(LHS, DAG, LHS1, LHS2);
2883 expandf64Toi32(RHS, DAG, RHS1, RHS2);
2884 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
2885 ARMcc = DAG.getConstant(CondCode, MVT::i32);
2886 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Glue);
2887 SDValue Ops[] = { Chain, ARMcc, LHS1, LHS2, RHS1, RHS2, Dest };
2888 return DAG.getNode(ARMISD::BCC_i64, dl, VTList, Ops, 7);
2889 }
2890
2891 return SDValue();
2892 }
2893
2894 SDValue ARMTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
2895 SDValue Chain = Op.getOperand(0);
2896 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
2897 SDValue LHS = Op.getOperand(2);
2898 SDValue RHS = Op.getOperand(3);
2899 SDValue Dest = Op.getOperand(4);
2900 DebugLoc dl = Op.getDebugLoc();
2901
2902 if (LHS.getValueType() == MVT::i32) {
2903 SDValue ARMcc;
2904 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMcc, DAG, dl);
2905 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2906 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
2907 Chain, Dest, ARMcc, CCR, Cmp);
2908 }
2909
2910 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
2911
2912 if (UnsafeFPMath &&
2913 (CC == ISD::SETEQ || CC == ISD::SETOEQ ||
2914 CC == ISD::SETNE || CC == ISD::SETUNE)) {
2915 SDValue Result = OptimizeVFPBrcond(Op, DAG);
2916 if (Result.getNode())
2917 return Result;
2918 }
2919
2920 ARMCC::CondCodes CondCode, CondCode2;
2921 FPCCToARMCC(CC, CondCode, CondCode2);
2922
2923 SDValue ARMcc = DAG.getConstant(CondCode, MVT::i32);
2924 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
2925 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2926 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Glue);
2927 SDValue Ops[] = { Chain, Dest, ARMcc, CCR, Cmp };
2928 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
2929 if (CondCode2 != ARMCC::AL) {
2930 ARMcc = DAG.getConstant(CondCode2, MVT::i32);
2931 SDValue Ops[] = { Res, Dest, ARMcc, CCR, Res.getValue(1) };
2932 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
2933 }
2934 return Res;
2935 }
2936
2937 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) const {
2938 SDValue Chain = Op.getOperand(0);
2939 SDValue Table = Op.getOperand(1);
2940 SDValue Index = Op.getOperand(2);
2941 DebugLoc dl = Op.getDebugLoc();
2942
2943 EVT PTy = getPointerTy();
2944 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
2945 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
2946 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
2947 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
2948 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
2949 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
2950 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
2951 if (Subtarget->isThumb2()) {
2952 // Thumb2 uses a two-level jump. That is, it jumps into the jump table
2953 // which does another jump to the destination. This also makes it easier
2954 // to translate it to TBB / TBH later.
2955 // FIXME: This might not work if the function is extremely large.
2956 return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain,
2957 Addr, Op.getOperand(2), JTI, UId);
2958 }
2959 if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
2960 Addr = DAG.getLoad((EVT)MVT::i32, dl, Chain, Addr,
2961 MachinePointerInfo::getJumpTable(),
2962 false, false, 0);
2963 Chain = Addr.getValue(1);
2964 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
2965 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
2966 } else {
2967 Addr = DAG.getLoad(PTy, dl, Chain, Addr,
2968 MachinePointerInfo::getJumpTable(), false, false, 0);
2969 Chain = Addr.getValue(1);
2970 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
2971 }
2972 }
2973
2974 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
2975 DebugLoc dl = Op.getDebugLoc();
2976 unsigned Opc;
2977
2978 switch (Op.getOpcode()) {
2979 default:
2980 assert(0 && "Invalid opcode!");
2981 case ISD::FP_TO_SINT:
2982 Opc = ARMISD::FTOSI;
2983 break;
2984 case ISD::FP_TO_UINT:
2985 Opc = ARMISD::FTOUI;
2986 break;
2987 }
2988 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
2989 return DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op);
2990 }
2991
2992 static SDValue LowerVectorINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
2993 EVT VT = Op.getValueType();
2994 DebugLoc dl = Op.getDebugLoc();
2995
2996 EVT OperandVT = Op.getOperand(0).getValueType();
2997 assert(OperandVT == MVT::v4i16 && "Invalid type for custom lowering!");
2998 if (VT != MVT::v4f32)
2999 return DAG.UnrollVectorOp(Op.getNode());
3000
3001 unsigned CastOpc;
3002 unsigned Opc;
3003 switch (Op.getOpcode()) {
3004 default:
3005 assert(0 && "Invalid opcode!");
3006 case ISD::SINT_TO_FP:
3007 CastOpc = ISD::SIGN_EXTEND;
3008 Opc = ISD::SINT_TO_FP;
3009 break;
3010 case ISD::UINT_TO_FP:
3011 CastOpc = ISD::ZERO_EXTEND;
3012 Opc = ISD::UINT_TO_FP;
3013 break;
3014 }
3015
3016 Op = DAG.getNode(CastOpc, dl, MVT::v4i32, Op.getOperand(0));
3017 return DAG.getNode(Opc, dl, VT, Op);
3018 }
3019
3020 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
3021 EVT VT = Op.getValueType();
3022 if (VT.isVector())
3023 return LowerVectorINT_TO_FP(Op, DAG);
3024
3025 DebugLoc dl = Op.getDebugLoc();
3026 unsigned Opc;
3027
3028 switch (Op.getOpcode()) {
3029 default:
3030 assert(0 && "Invalid opcode!");
3031 case ISD::SINT_TO_FP:
3032 Opc = ARMISD::SITOF;
3033 break;
3034 case ISD::UINT_TO_FP:
3035 Opc = ARMISD::UITOF;
3036 break;
3037 }
3038
3039 Op = DAG.getNode(ISD::BITCAST, dl, MVT::f32, Op.getOperand(0));
3040 return DAG.getNode(Opc, dl, VT, Op);
3041 }
3042
3043 SDValue ARMTargetLowering::LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const {
3044 // Implement fcopysign with a fabs and a conditional fneg.
3045 SDValue Tmp0 = Op.getOperand(0);
3046 SDValue Tmp1 = Op.getOperand(1);
3047 DebugLoc dl = Op.getDebugLoc();
3048 EVT VT = Op.getValueType();
3049 EVT SrcVT = Tmp1.getValueType();
3050 bool InGPR = Tmp0.getOpcode() == ISD::BITCAST ||
3051 Tmp0.getOpcode() == ARMISD::VMOVDRR;
3052 bool UseNEON = !InGPR && Subtarget->hasNEON();
3053
3054 if (UseNEON) {
3055 // Use VBSL to copy the sign bit.
3056 unsigned EncodedVal = ARM_AM::createNEONModImm(0x6, 0x80);
3057 SDValue Mask = DAG.getNode(ARMISD::VMOVIMM, dl, MVT::v2i32,
3058 DAG.getTargetConstant(EncodedVal, MVT::i32));
3059 EVT OpVT = (VT == MVT::f32) ? MVT::v2i32 : MVT::v1i64;
3060 if (VT == MVT::f64)
3061 Mask = DAG.getNode(ARMISD::VSHL, dl, OpVT,
3062 DAG.getNode(ISD::BITCAST, dl, OpVT, Mask),
3063 DAG.getConstant(32, MVT::i32));
3064 else /*if (VT == MVT::f32)*/
3065 Tmp0 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f32, Tmp0);
3066 if (SrcVT == MVT::f32) {
3067 Tmp1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f32, Tmp1);
3068 if (VT == MVT::f64)
3069 Tmp1 = DAG.getNode(ARMISD::VSHL, dl, OpVT,
3070 DAG.getNode(ISD::BITCAST, dl, OpVT, Tmp1),
3071 DAG.getConstant(32, MVT::i32));
3072 } else if (VT == MVT::f32)
3073 Tmp1 = DAG.getNode(ARMISD::VSHRu, dl, MVT::v1i64,
3074 DAG.getNode(ISD::BITCAST, dl, MVT::v1i64, Tmp1),
3075 DAG.getConstant(32, MVT::i32));
3076 Tmp0 = DAG.getNode(ISD::BITCAST, dl, OpVT, Tmp0);
3077 Tmp1 = DAG.getNode(ISD::BITCAST, dl, OpVT, Tmp1);
3078
3079 SDValue AllOnes = DAG.getTargetConstant(ARM_AM::createNEONModImm(0xe, 0xff),
3080 MVT::i32);
3081 AllOnes = DAG.getNode(ARMISD::VMOVIMM, dl, MVT::v8i8, AllOnes);
3082 SDValue MaskNot = DAG.getNode(ISD::XOR, dl, OpVT, Mask,
3083 DAG.getNode(ISD::BITCAST, dl, OpVT, AllOnes));
3084
3085 SDValue Res = DAG.getNode(ISD::OR, dl, OpVT,
3086 DAG.getNode(ISD::AND, dl, OpVT, Tmp1, Mask),
3087 DAG.getNode(ISD::AND, dl, OpVT, Tmp0, MaskNot));
3088 if (VT == MVT::f32) {
3089 Res = DAG.getNode(ISD::BITCAST, dl, MVT::v2f32, Res);
3090 Res = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f32, Res,
3091 DAG.getConstant(0, MVT::i32));
3092 } else {
3093 Res = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Res);
3094 }
3095
3096 return Res;
3097 }
3098
3099 // Bitcast operand 1 to i32.
3100 if (SrcVT == MVT::f64)
3101 Tmp1 = DAG.getNode(ARMISD::VMOVRRD, dl, DAG.getVTList(MVT::i32, MVT::i32),
3102 &Tmp1, 1).getValue(1);
3103 Tmp1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Tmp1);
3104
3105 // Or in the signbit with integer operations.
3106 SDValue Mask1 = DAG.getConstant(0x80000000, MVT::i32);
3107 SDValue Mask2 = DAG.getConstant(0x7fffffff, MVT::i32);
3108 Tmp1 = DAG.getNode(ISD::AND, dl, MVT::i32, Tmp1, Mask1);
3109 if (VT == MVT::f32) {
3110 Tmp0 = DAG.getNode(ISD::AND, dl, MVT::i32,
3111 DAG.getNode(ISD::BITCAST, dl, MVT::i32, Tmp0), Mask2);
3112 return DAG.getNode(ISD::BITCAST, dl, MVT::f32,
3113 DAG.getNode(ISD::OR, dl, MVT::i32, Tmp0, Tmp1));
3114 }
3115
3116 // f64: Or the high part with signbit and then combine two parts.
3117 Tmp0 = DAG.getNode(ARMISD::VMOVRRD, dl, DAG.getVTList(MVT::i32, MVT::i32),
3118 &Tmp0, 1);
3119 SDValue Lo = Tmp0.getValue(0);
3120 SDValue Hi = DAG.getNode(ISD::AND, dl, MVT::i32, Tmp0.getValue(1), Mask2);
3121 Hi = DAG.getNode(ISD::OR, dl, MVT::i32, Hi, Tmp1);
3122 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
3123 }
3124
3125 SDValue ARMTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const{
3126 MachineFunction &MF = DAG.getMachineFunction();
3127 MachineFrameInfo *MFI = MF.getFrameInfo();
3128 MFI->setReturnAddressIsTaken(true);
3129
3130 EVT VT = Op.getValueType();
3131 DebugLoc dl = Op.getDebugLoc();
3132 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
3133 if (Depth) {
3134 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
3135 SDValue Offset = DAG.getConstant(4, MVT::i32);
3136 return DAG.getLoad(VT, dl, DAG.getEntryNode(),
3137 DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
3138 MachinePointerInfo(), false, false, 0);
3139 }
3140
3141 // Return LR, which contains the return address. Mark it an implicit live-in.
3142 unsigned Reg = MF.addLiveIn(ARM::LR, getRegClassFor(MVT::i32));
3143 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
3144 }
3145
3146 SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
3147 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3148 MFI->setFrameAddressIsTaken(true);
3149
3150 EVT VT = Op.getValueType();
3151 DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
3152 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
3153 unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetDarwin())
3154 ? ARM::R7 : ARM::R11;
3155 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
3156 while (Depth--)
3157 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
3158 MachinePointerInfo(),
3159 false, false, 0);
3160 return FrameAddr;
3161 }
3162
3163 /// ExpandBITCAST - If the target supports VFP, this function is called to
3164 /// expand a bit convert where either the source or destination type is i64 to
3165 /// use a VMOVDRR or VMOVRRD node. This should not be done when the non-i64
3166 /// operand type is illegal (e.g., v2f32 for a target that doesn't support
3167 /// vectors), since the legalizer won't know what to do with that.
3168 static SDValue ExpandBITCAST(SDNode *N, SelectionDAG &DAG) {
3169 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3170 DebugLoc dl = N->getDebugLoc();
3171 SDValue Op = N->getOperand(0);
3172
3173 // This function is only supposed to be called for i64 types, either as the
3174 // source or destination of the bit convert.
3175 EVT SrcVT = Op.getValueType();
3176 EVT DstVT = N->getValueType(0);
3177 assert((SrcVT == MVT::i64 || DstVT == MVT::i64) &&
3178 "ExpandBITCAST called for non-i64 type");
3179
3180 // Turn i64->f64 into VMOVDRR.
3181 if (SrcVT == MVT::i64 && TLI.isTypeLegal(DstVT)) {
3182 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
3183 DAG.getConstant(0, MVT::i32));
3184 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
3185 DAG.getConstant(1, MVT::i32));
3186 return DAG.getNode(ISD::BITCAST, dl, DstVT,
3187 DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi));
3188 }
3189
3190 // Turn f64->i64 into VMOVRRD.
3191 if (DstVT == MVT::i64 && TLI.isTypeLegal(SrcVT)) {
3192 SDValue Cvt = DAG.getNode(ARMISD::VMOVRRD, dl,
3193 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
3194 // Merge the pieces into a single i64 value.
3195 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
3196 }
3197
3198 return SDValue();
3199 }
3200
3201 /// getZeroVector - Returns a vector of specified type with all zero elements.
3202 /// Zero vectors are used to represent vector negation and in those cases
3203 /// will be implemented with the NEON VNEG instruction. However, VNEG does
3204 /// not support i64 elements, so sometimes the zero vectors will need to be
3205 /// explicitly constructed. Regardless, use a canonical VMOV to create the
3206 /// zero vector.
3207 static SDValue getZeroVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
3208 assert(VT.isVector() && "Expected a vector type");
3209 // The canonical modified immediate encoding of a zero vector is....0!
3210 SDValue EncodedVal = DAG.getTargetConstant(0, MVT::i32);
3211 EVT VmovVT = VT.is128BitVector() ? MVT::v4i32 : MVT::v2i32;
3212 SDValue Vmov = DAG.getNode(ARMISD::VMOVIMM, dl, VmovVT, EncodedVal);
3213 return DAG.getNode(ISD::BITCAST, dl, VT, Vmov);
3214 }
3215
3216 /// LowerShiftRightParts - Lower SRA_PARTS, which returns two
3217 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
3218 SDValue ARMTargetLowering::LowerShiftRightParts(SDValue Op,
3219 SelectionDAG &DAG) const {
3220 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
3221 EVT VT = Op.getValueType();
3222 unsigned VTBits = VT.getSizeInBits();
3223 DebugLoc dl = Op.getDebugLoc();
3224 SDValue ShOpLo = Op.getOperand(0);
3225 SDValue ShOpHi = Op.getOperand(1);
3226 SDValue ShAmt = Op.getOperand(2);
3227 SDValue ARMcc;
3228 unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
3229
3230 assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
3231
3232 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
3233 DAG.getConstant(VTBits, MVT::i32), ShAmt);
3234 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
3235 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
3236 DAG.getConstant(VTBits, MVT::i32));
3237 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
3238 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
3239 SDValue TrueVal = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
3240
3241 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
3242 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
3243 ARMcc, DAG, dl);
3244 SDValue Hi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
3245 SDValue Lo = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMcc,
3246 CCR, Cmp);
3247
3248 SDValue Ops[2] = { Lo, Hi };
3249 return DAG.getMergeValues(Ops, 2, dl);
3250 }
3251
3252 /// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
3253 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
3254 SDValue ARMTargetLowering::LowerShiftLeftParts(SDValue Op,
3255 SelectionDAG &DAG) const {
3256 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
3257 EVT VT = Op.getValueType();
3258 unsigned VTBits = VT.getSizeInBits();
3259 DebugLoc dl = Op.getDebugLoc();
3260 SDValue ShOpLo = Op.getOperand(0);
3261 SDValue ShOpHi = Op.getOperand(1);
3262 SDValue ShAmt = Op.getOperand(2);
3263 SDValue ARMcc;
3264
3265 assert(Op.getOpcode() == ISD::SHL_PARTS);
3266 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
3267 DAG.getConstant(VTBits, MVT::i32), ShAmt);
3268 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
3269 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
3270 DAG.getConstant(VTBits, MVT::i32));
3271 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
3272 SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
3273
3274 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
3275 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
3276 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
3277 ARMcc, DAG, dl);
3278 SDValue Lo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
3279 SDValue Hi = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, Tmp3, ARMcc,
3280 CCR, Cmp);
3281
3282 SDValue Ops[2] = { Lo, Hi };
3283 return DAG.getMergeValues(Ops, 2, dl);
3284 }
3285
3286 SDValue ARMTargetLowering::LowerFLT_ROUNDS_(SDValue Op,
3287 SelectionDAG &DAG) const {
3288 // The rounding mode is in bits 23:22 of the FPSCR.
3289 // The ARM rounding mode value to FLT_ROUNDS mapping is 0->1, 1->2, 2->3, 3->0
3290 // The formula we use to implement this is (((FPSCR + 1 << 22) >> 22) & 3)
3291 // so that the shift + and get folded into a bitfield extract.
3292 DebugLoc dl = Op.getDebugLoc();
3293 SDValue FPSCR = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::i32,
3294 DAG.getConstant(Intrinsic::arm_get_fpscr,
3295 MVT::i32));
3296 SDValue FltRounds = DAG.getNode(ISD::ADD, dl, MVT::i32, FPSCR,
3297 DAG.getConstant(1U << 22, MVT::i32));
3298 SDValue RMODE = DAG.getNode(ISD::SRL, dl, MVT::i32, FltRounds,
3299 DAG.getConstant(22, MVT::i32));
3300 return DAG.getNode(ISD::AND, dl, MVT::i32, RMODE,
3301 DAG.getConstant(3, MVT::i32));
3302 }
3303
3304 static SDValue LowerCTTZ(SDNode *N, SelectionDAG &DAG,
3305 const ARMSubtarget *ST) {
3306 EVT VT = N->getValueType(0);
3307 DebugLoc dl = N->getDebugLoc();
3308
3309 if (!ST->hasV6T2Ops())
3310 return SDValue();
3311
3312 SDValue rbit = DAG.getNode(ARMISD::RBIT, dl, VT, N->getOperand(0));
3313 return DAG.getNode(ISD::CTLZ, dl, VT, rbit);
3314 }
3315
3316 static SDValue LowerShift(SDNode *N, SelectionDAG &DAG,
3317 const ARMSubtarget *ST) {
3318 EVT VT = N->getValueType(0);
3319 DebugLoc dl = N->getDebugLoc();
3320
3321 if (!VT.isVector())
3322 return SDValue();
3323
3324 // Lower vector shifts on NEON to use VSHL.
3325 assert(ST->hasNEON() && "unexpected vector shift");
3326
3327 // Left shifts translate directly to the vshiftu intrinsic.
3328 if (N->getOpcode() == ISD::SHL)
3329 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
3330 DAG.getConstant(Intrinsic::arm_neon_vshiftu, MVT::i32),
3331 N->getOperand(0), N->getOperand(1));
3332
3333 assert((N->getOpcode() == ISD::SRA ||
3334 N->getOpcode() == ISD::SRL) && "unexpected vector shift opcode");
3335
3336 // NEON uses the same intrinsics for both left and right shifts. For
3337 // right shifts, the shift amounts are negative, so negate the vector of
3338 // shift amounts.
3339 EVT ShiftVT = N->getOperand(1).getValueType();
3340 SDValue NegatedCount = DAG.getNode(ISD::SUB, dl, ShiftVT,
3341 getZeroVector(ShiftVT, DAG, dl),
3342 N->getOperand(1));
3343 Intrinsic::ID vshiftInt = (N->getOpcode() == ISD::SRA ?
3344 Intrinsic::arm_neon_vshifts :
3345 Intrinsic::arm_neon_vshiftu);
3346 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
3347 DAG.getConstant(vshiftInt, MVT::i32),
3348 N->getOperand(0), NegatedCount);
3349 }
3350
3351 static SDValue Expand64BitShift(SDNode *N, SelectionDAG &DAG,
3352 const ARMSubtarget *ST) {
3353 EVT VT = N->getValueType(0);
3354 DebugLoc dl = N->getDebugLoc();
3355
3356 // We can get here for a node like i32 = ISD::SHL i32, i64
3357 if (VT != MVT::i64)
3358 return SDValue();
3359
3360 assert((N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
3361 "Unknown shift to lower!");
3362
3363 // We only lower SRA, SRL of 1 here, all others use generic lowering.
3364 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
3365 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
3366 return SDValue();
3367
3368 // If we are in thumb mode, we don't have RRX.
3369 if (ST->isThumb1Only()) return SDValue();
3370
3371 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
3372 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
3373 DAG.getConstant(0, MVT::i32));
3374 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
3375 DAG.getConstant(1, MVT::i32));
3376
3377 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
3378 // captures the result into a carry flag.
3379 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
3380 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Glue), &Hi, 1);
3381
3382 // The low part is an ARMISD::RRX operand, which shifts the carry in.
3383 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
3384
3385 // Merge the pieces into a single i64 value.
3386 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
3387 }
3388
3389 static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) {
3390 SDValue TmpOp0, TmpOp1;
3391 bool Invert = false;
3392 bool Swap = false;
3393 unsigned Opc = 0;
3394
3395 SDValue Op0 = Op.getOperand(0);
3396 SDValue Op1 = Op.getOperand(1);
3397 SDValue CC = Op.getOperand(2);
3398 EVT VT = Op.getValueType();
3399 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
3400 DebugLoc dl = Op.getDebugLoc();
3401
3402 if (Op.getOperand(1).getValueType().isFloatingPoint()) {
3403 switch (SetCCOpcode) {
3404 default: llvm_unreachable("Illegal FP comparison"); break;
3405 case ISD::SETUNE:
3406 case ISD::SETNE: Invert = true; // Fallthrough
3407 case ISD::SETOEQ:
3408 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
3409 case ISD::SETOLT:
3410 case ISD::SETLT: Swap = true; // Fallthrough
3411 case ISD::SETOGT:
3412 case ISD::SETGT: Opc = ARMISD::VCGT; break;
3413 case ISD::SETOLE:
3414 case ISD::SETLE: Swap = true; // Fallthrough
3415 case ISD::SETOGE:
3416 case ISD::SETGE: Opc = ARMISD::VCGE; break;
3417 case ISD::SETUGE: Swap = true; // Fallthrough
3418 case ISD::SETULE: Invert = true; Opc = ARMISD::VCGT; break;
3419 case ISD::SETUGT: Swap = true; // Fallthrough
3420 case ISD::SETULT: Invert = true; Opc = ARMISD::VCGE; break;
3421 case ISD::SETUEQ: Invert = true; // Fallthrough
3422 case ISD::SETONE:
3423 // Expand this to (OLT | OGT).
3424 TmpOp0 = Op0;
3425 TmpOp1 = Op1;
3426 Opc = ISD::OR;
3427 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
3428 Op1 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp0, TmpOp1);
3429 break;
3430 case ISD::SETUO: Invert = true; // Fallthrough
3431 case ISD::SETO:
3432 // Expand this to (OLT | OGE).
3433 TmpOp0 = Op0;
3434 TmpOp1 = Op1;
3435 Opc = ISD::OR;
3436 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
3437 Op1 = DAG.getNode(ARMISD::VCGE, dl, VT, TmpOp0, TmpOp1);
3438 break;
3439 }
3440 } else {
3441 // Integer comparisons.
3442 switch (SetCCOpcode) {
3443 default: llvm_unreachable("Illegal integer comparison"); break;
3444 case ISD::SETNE: Invert = true;
3445 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
3446 case ISD::SETLT: Swap = true;
3447 case ISD::SETGT: Opc = ARMISD::VCGT; break;
3448 case ISD::SETLE: Swap = true;
3449 case ISD::SETGE: Opc = ARMISD::VCGE; break;
3450 case ISD::SETULT: Swap = true;
3451 case ISD::SETUGT: Opc = ARMISD::VCGTU; break;
3452 case ISD::SETULE: Swap = true;
3453 case ISD::SETUGE: Opc = ARMISD::VCGEU; break;
3454 }
3455
3456 // Detect VTST (Vector Test Bits) = icmp ne (and (op0, op1), zero).
3457 if (Opc == ARMISD::VCEQ) {
3458
3459 SDValue AndOp;
3460 if (ISD::isBuildVectorAllZeros(Op1.getNode()))
3461 AndOp = Op0;
3462 else if (ISD::isBuildVectorAllZeros(Op0.getNode()))
3463 AndOp = Op1;
3464
3465 // Ignore bitconvert.
3466 if (AndOp.getNode() && AndOp.getOpcode() == ISD::BITCAST)
3467 AndOp = AndOp.getOperand(0);
3468
3469 if (AndOp.getNode() && AndOp.getOpcode() == ISD::AND) {
3470 Opc = ARMISD::VTST;
3471 Op0 = DAG.getNode(ISD::BITCAST, dl, VT, AndOp.getOperand(0));
3472 Op1 = DAG.getNode(ISD::BITCAST, dl, VT, AndOp.getOperand(1));
3473 Invert = !Invert;
3474 }
3475 }
3476 }
3477
3478 if (Swap)
3479 std::swap(Op0, Op1);
3480
3481 // If one of the operands is a constant vector zero, attempt to fold the
3482 // comparison to a specialized compare-against-zero form.
3483 SDValue SingleOp;
3484 if (ISD::isBuildVectorAllZeros(Op1.getNode()))
3485 SingleOp = Op0;
3486 else if (ISD::isBuildVectorAllZeros(Op0.getNode())) {
3487 if (Opc == ARMISD::VCGE)
3488 Opc = ARMISD::VCLEZ;
3489 else if (Opc == ARMISD::VCGT)
3490 Opc = ARMISD::VCLTZ;
3491 SingleOp = Op1;
3492 }
3493
3494 SDValue Result;
3495 if (SingleOp.getNode()) {
3496 switch (Opc) {
3497 case ARMISD::VCEQ:
3498 Result = DAG.getNode(ARMISD::VCEQZ, dl, VT, SingleOp); break;
3499 case ARMISD::VCGE:
3500 Result = DAG.getNode(ARMISD::VCGEZ, dl, VT, SingleOp); break;
3501 case ARMISD::VCLEZ:
3502 Result = DAG.getNode(ARMISD::VCLEZ, dl, VT, SingleOp); break;
3503 case ARMISD::VCGT:
3504 Result = DAG.getNode(ARMISD::VCGTZ, dl, VT, SingleOp); break;
3505 case ARMISD::VCLTZ:
3506 Result = DAG.getNode(ARMISD::VCLTZ, dl, VT, SingleOp); break;
3507 default:
3508 Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
3509 }
3510 } else {
3511 Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
3512 }
3513
3514 if (Invert)
3515 Result = DAG.getNOT(dl, Result, VT);
3516
3517 return Result;
3518 }
3519
3520 /// isNEONModifiedImm - Check if the specified splat value corresponds to a
3521 /// valid vector constant for a NEON instruction with a "modified immediate"
3522 /// operand (e.g., VMOV). If so, return the encoded value.
3523 static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
3524 unsigned SplatBitSize, SelectionDAG &DAG,
3525 EVT &VT, bool is128Bits, NEONModImmType type) {
3526 unsigned OpCmode, Imm;
3527
3528 // SplatBitSize is set to the smallest size that splats the vector, so a
3529 // zero vector will always have SplatBitSize == 8. However, NEON modified
3530 // immediate instructions others than VMOV do not support the 8-bit encoding
3531 // of a zero vector, and the default encoding of zero is supposed to be the
3532 // 32-bit version.
3533 if (SplatBits == 0)
3534 SplatBitSize = 32;
3535
3536 switch (SplatBitSize) {
3537 case 8:
3538 if (type != VMOVModImm)
3539 return SDValue();
3540 // Any 1-byte value is OK. Op=0, Cmode=1110.
3541 assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big");
3542 OpCmode = 0xe;
3543 Imm = SplatBits;
3544 VT = is128Bits ? MVT::v16i8 : MVT::v8i8;
3545 break;
3546
3547 case 16:
3548 // NEON's 16-bit VMOV supports splat values where only one byte is nonzero.
3549 VT = is128Bits ? MVT::v8i16 : MVT::v4i16;
3550 if ((SplatBits & ~0xff) == 0) {
3551 // Value = 0x00nn: Op=x, Cmode=100x.
3552 OpCmode = 0x8;
3553 Imm = SplatBits;
3554 break;
3555 }
3556 if ((SplatBits & ~0xff00) == 0) {
3557 // Value = 0xnn00: Op=x, Cmode=101x.
3558 OpCmode = 0xa;
3559 Imm = SplatBits >> 8;
3560 break;
3561 }
3562 return SDValue();
3563
3564 case 32:
3565 // NEON's 32-bit VMOV supports splat values where:
3566 // * only one byte is nonzero, or
3567 // * the least significant byte is 0xff and the second byte is nonzero, or
3568 // * the least significant 2 bytes are 0xff and the third is nonzero.
3569 VT = is128Bits ? MVT::v4i32 : MVT::v2i32;
3570 if ((SplatBits & ~0xff) == 0) {
3571 // Value = 0x000000nn: Op=x, Cmode=000x.
3572 OpCmode = 0;
3573 Imm = SplatBits;
3574 break;
3575 }
3576 if ((SplatBits & ~0xff00) == 0) {
3577 // Value = 0x0000nn00: Op=x, Cmode=001x.
3578 OpCmode = 0x2;
3579 Imm = SplatBits >> 8;
3580 break;
3581 }
3582 if ((SplatBits & ~0xff0000) == 0) {
3583 // Value = 0x00nn0000: Op=x, Cmode=010x.
3584 OpCmode = 0x4;
3585 Imm = SplatBits >> 16;
3586 break;
3587 }
3588 if ((SplatBits & ~0xff000000) == 0) {
3589 // Value = 0xnn000000: Op=x, Cmode=011x.
3590 OpCmode = 0x6;
3591 Imm = SplatBits >> 24;
3592 break;
3593 }
3594
3595 // cmode == 0b1100 and cmode == 0b1101 are not supported for VORR or VBIC
3596 if (type == OtherModImm) return SDValue();
3597
3598 if ((SplatBits & ~0xffff) == 0 &&
3599 ((SplatBits | SplatUndef) & 0xff) == 0xff) {
3600 // Value = 0x0000nnff: Op=x, Cmode=1100.
3601 OpCmode = 0xc;
3602 Imm = SplatBits >> 8;
3603 SplatBits |= 0xff;
3604 break;
3605 }
3606
3607 if ((SplatBits & ~0xffffff) == 0 &&
3608 ((SplatBits | SplatUndef) & 0xffff) == 0xffff) {
3609 // Value = 0x00nnffff: Op=x, Cmode=1101.
3610 OpCmode = 0xd;
3611 Imm = SplatBits >> 16;
3612 SplatBits |= 0xffff;
3613 break;
3614 }
3615
3616 // Note: there are a few 32-bit splat values (specifically: 00ffff00,
3617 // ff000000, ff0000ff, and ffff00ff) that are valid for VMOV.I64 but not
3618 // VMOV.I32. A (very) minor optimization would be to replicate the value
3619 // and fall through here to test for a valid 64-bit splat. But, then the
3620 // caller would also need to check and handle the change in size.
3621 return SDValue();
3622
3623 case 64: {
3624 if (type != VMOVModImm)
3625 return SDValue();
3626 // NEON has a 64-bit VMOV splat where each byte is either 0 or 0xff.
3627 uint64_t BitMask = 0xff;
3628 uint64_t Val = 0;
3629 unsigned ImmMask = 1;
3630 Imm = 0;
3631 for (int ByteNum = 0; ByteNum < 8; ++ByteNum) {
3632 if (((SplatBits | SplatUndef) & BitMask) == BitMask) {
3633 Val |= BitMask;
3634 Imm |= ImmMask;
3635 } else if ((SplatBits & BitMask) != 0) {
3636 return SDValue();
3637 }
3638 BitMask <<= 8;
3639 ImmMask <<= 1;
3640 }
3641 // Op=1, Cmode=1110.
3642 OpCmode = 0x1e;
3643 SplatBits = Val;
3644 VT = is128Bits ? MVT::v2i64 : MVT::v1i64;
3645 break;
3646 }
3647
3648 default:
3649 llvm_unreachable("unexpected size for isNEONModifiedImm");
3650 return SDValue();
3651 }
3652
3653 unsigned EncodedVal = ARM_AM::createNEONModImm(OpCmode, Imm);
3654 return DAG.getTargetConstant(EncodedVal, MVT::i32);
3655 }
3656
3657 static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT,
3658 bool &ReverseVEXT, unsigned &Imm) {
3659 unsigned NumElts = VT.getVectorNumElements();
3660 ReverseVEXT = false;
3661
3662 // Assume that the first shuffle index is not UNDEF. Fail if it is.
3663 if (M[0] < 0)
3664 return false;
3665
3666 Imm = M[0];
3667
3668 // If this is a VEXT shuffle, the immediate value is the index of the first
3669 // element. The other shuffle indices must be the successive elements after
3670 // the first one.
3671 unsigned ExpectedElt = Imm;
3672 for (unsigned i = 1; i < NumElts; ++i) {
3673 // Increment the expected index. If it wraps around, it may still be
3674 // a VEXT but the source vectors must be swapped.
3675 ExpectedElt += 1;
3676 if (ExpectedElt == NumElts * 2) {
3677 ExpectedElt = 0;
3678 ReverseVEXT = true;
3679 }
3680
3681 if (M[i] < 0) continue; // ignore UNDEF indices
3682 if (ExpectedElt != static_cast<unsigned>(M[i]))
3683 return false;
3684 }
3685
3686 // Adjust the index value if the source operands will be swapped.
3687 if (ReverseVEXT)
3688 Imm -= NumElts;
3689
3690 return true;
3691 }
3692
3693 /// isVREVMask - Check if a vector shuffle corresponds to a VREV
3694 /// instruction with the specified blocksize. (The order of the elements
3695 /// within each block of the vector is reversed.)
3696 static bool isVREVMask(const SmallVectorImpl<int> &M, EVT VT,
3697 unsigned BlockSize) {
3698 assert((BlockSize==16 || BlockSize==32 || BlockSize==64) &&
3699 "Only possible block sizes for VREV are: 16, 32, 64");
3700
3701 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3702 if (EltSz == 64)
3703 return false;
3704
3705 unsigned NumElts = VT.getVectorNumElements();
3706 unsigned BlockElts = M[0] + 1;
3707 // If the first shuffle index is UNDEF, be optimistic.
3708 if (M[0] < 0)
3709 BlockElts = BlockSize / EltSz;
3710
3711 if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
3712 return false;
3713
3714 for (unsigned i = 0; i < NumElts; ++i) {
3715 if (M[i] < 0) continue; // ignore UNDEF indices
3716 if ((unsigned) M[i] != (i - i%BlockElts) + (BlockElts - 1 - i%BlockElts))
3717 return false;
3718 }
3719
3720 return true;
3721 }
3722
3723 static bool isVTBLMask(const SmallVectorImpl<int> &M, EVT VT) {
3724 // We can handle <8 x i8> vector shuffles. If the index in the mask is out of
3725 // range, then 0 is placed into the resulting vector. So pretty much any mask
3726 // of 8 elements can work here.
3727 return VT == MVT::v8i8 && M.size() == 8;
3728 }
3729
3730 static bool isVTRNMask(const SmallVectorImpl<int> &M, EVT VT,
3731 unsigned &WhichResult) {
3732 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3733 if (EltSz == 64)
3734 return false;
3735
3736 unsigned NumElts = VT.getVectorNumElements();
3737 WhichResult = (M[0] == 0 ? 0 : 1);
3738 for (unsigned i = 0; i < NumElts; i += 2) {
3739 if ((M[i] >= 0 && (unsigned) M[i] != i + WhichResult) ||
3740 (M[i+1] >= 0 && (unsigned) M[i+1] != i + NumElts + WhichResult))
3741 return false;
3742 }
3743 return true;
3744 }
3745
3746 /// isVTRN_v_undef_Mask - Special case of isVTRNMask for canonical form of
3747 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3748 /// Mask is e.g., <0, 0, 2, 2> instead of <0, 4, 2, 6>.
3749 static bool isVTRN_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3750 unsigned &WhichResult) {
3751 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3752 if (EltSz == 64)
3753 return false;
3754
3755 unsigned NumElts = VT.getVectorNumElements();
3756 WhichResult = (M[0] == 0 ? 0 : 1);
3757 for (unsigned i = 0; i < NumElts; i += 2) {
3758 if ((M[i] >= 0 && (unsigned) M[i] != i + WhichResult) ||
3759 (M[i+1] >= 0 && (unsigned) M[i+1] != i + WhichResult))
3760 return false;
3761 }
3762 return true;
3763 }
3764
3765 static bool isVUZPMask(const SmallVectorImpl<int> &M, EVT VT,
3766 unsigned &WhichResult) {
3767 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3768 if (EltSz == 64)
3769 return false;
3770
3771 unsigned NumElts = VT.getVectorNumElements();
3772 WhichResult = (M[0] == 0 ? 0 : 1);
3773 for (unsigned i = 0; i != NumElts; ++i) {
3774 if (M[i] < 0) continue; // ignore UNDEF indices
3775 if ((unsigned) M[i] != 2 * i + WhichResult)
3776 return false;
3777 }
3778
3779 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3780 if (VT.is64BitVector() && EltSz == 32)
3781 return false;
3782
3783 return true;
3784 }
3785
3786 /// isVUZP_v_undef_Mask - Special case of isVUZPMask for canonical form of
3787 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3788 /// Mask is e.g., <0, 2, 0, 2> instead of <0, 2, 4, 6>,
3789 static bool isVUZP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3790 unsigned &WhichResult) {
3791 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3792 if (EltSz == 64)
3793 return false;
3794
3795 unsigned Half = VT.getVectorNumElements() / 2;
3796 WhichResult = (M[0] == 0 ? 0 : 1);
3797 for (unsigned j = 0; j != 2; ++j) {
3798 unsigned Idx = WhichResult;
3799 for (unsigned i = 0; i != Half; ++i) {
3800 int MIdx = M[i + j * Half];
3801 if (MIdx >= 0 && (unsigned) MIdx != Idx)
3802 return false;
3803 Idx += 2;
3804 }
3805 }
3806
3807 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3808 if (VT.is64BitVector() && EltSz == 32)
3809 return false;
3810
3811 return true;
3812 }
3813
3814 static bool isVZIPMask(const SmallVectorImpl<int> &M, EVT VT,
3815 unsigned &WhichResult) {
3816 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3817 if (EltSz == 64)
3818 return false;
3819
3820 unsigned NumElts = VT.getVectorNumElements();
3821 WhichResult = (M[0] == 0 ? 0 : 1);
3822 unsigned Idx = WhichResult * NumElts / 2;
3823 for (unsigned i = 0; i != NumElts; i += 2) {
3824 if ((M[i] >= 0 && (unsigned) M[i] != Idx) ||
3825 (M[i+1] >= 0 && (unsigned) M[i+1] != Idx + NumElts))
3826 return false;
3827 Idx += 1;
3828 }
3829
3830 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3831 if (VT.is64BitVector() && EltSz == 32)
3832 return false;
3833
3834 return true;
3835 }
3836
3837 /// isVZIP_v_undef_Mask - Special case of isVZIPMask for canonical form of
3838 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3839 /// Mask is e.g., <0, 0, 1, 1> instead of <0, 4, 1, 5>.
3840 static bool isVZIP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3841 unsigned &WhichResult) {
3842 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3843 if (EltSz == 64)
3844 return false;
3845
3846 unsigned NumElts = VT.getVectorNumElements();
3847 WhichResult = (M[0] == 0 ? 0 : 1);
3848 unsigned Idx = WhichResult * NumElts / 2;
3849 for (unsigned i = 0; i != NumElts; i += 2) {
3850 if ((M[i] >= 0 && (unsigned) M[i] != Idx) ||
3851 (M[i+1] >= 0 && (unsigned) M[i+1] != Idx))
3852 return false;
3853 Idx += 1;
3854 }
3855
3856 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3857 if (VT.is64BitVector() && EltSz == 32)
3858 return false;
3859
3860 return true;
3861 }
3862
3863 // If N is an integer constant that can be moved into a register in one
3864 // instruction, return an SDValue of such a constant (will become a MOV
3865 // instruction). Otherwise return null.
3866 static SDValue IsSingleInstrConstant(SDValue N, SelectionDAG &DAG,
3867 const ARMSubtarget *ST, DebugLoc dl) {
3868 uint64_t Val;
3869 if (!isa<ConstantSDNode>(N))
3870 return SDValue();
3871 Val = cast<ConstantSDNode>(N)->getZExtValue();
3872
3873 if (ST->isThumb1Only()) {
3874 if (Val <= 255 || ~Val <= 255)
3875 return DAG.getConstant(Val, MVT::i32);
3876 } else {
3877 if (ARM_AM::getSOImmVal(Val) != -1 || ARM_AM::getSOImmVal(~Val) != -1)
3878 return DAG.getConstant(Val, MVT::i32);
3879 }
3880 return SDValue();
3881 }
3882
3883 // If this is a case we can't handle, return null and let the default
3884 // expansion code take care of it.
3885 SDValue ARMTargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
3886 const ARMSubtarget *ST) const {
3887 BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
3888 DebugLoc dl = Op.getDebugLoc();
3889 EVT VT = Op.getValueType();
3890
3891 APInt SplatBits, SplatUndef;
3892 unsigned SplatBitSize;
3893 bool HasAnyUndefs;
3894 if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
3895 if (SplatBitSize <= 64) {
3896 // Check if an immediate VMOV works.
3897 EVT VmovVT;
3898 SDValue Val = isNEONModifiedImm(SplatBits.getZExtValue(),
3899 SplatUndef.getZExtValue(), SplatBitSize,
3900 DAG, VmovVT, VT.is128BitVector(),
3901 VMOVModImm);
3902 if (Val.getNode()) {
3903 SDValue Vmov = DAG.getNode(ARMISD::VMOVIMM, dl, VmovVT, Val);
3904 return DAG.getNode(ISD::BITCAST, dl, VT, Vmov);
3905 }
3906
3907 // Try an immediate VMVN.
3908 uint64_t NegatedImm = (SplatBits.getZExtValue() ^
3909 ((1LL << SplatBitSize) - 1));
3910 Val = isNEONModifiedImm(NegatedImm,
3911 SplatUndef.getZExtValue(), SplatBitSize,
3912 DAG, VmovVT, VT.is128BitVector(),
3913 VMVNModImm);
3914 if (Val.getNode()) {
3915 SDValue Vmov = DAG.getNode(ARMISD::VMVNIMM, dl, VmovVT, Val);
3916 return DAG.getNode(ISD::BITCAST, dl, VT, Vmov);
3917 }
3918 }
3919 }
3920
3921 // Scan through the operands to see if only one value is used.
3922 unsigned NumElts = VT.getVectorNumElements();
3923 bool isOnlyLowElement = true;
3924 bool usesOnlyOneValue = true;
3925 bool isConstant = true;
3926 SDValue Value;
3927 for (unsigned i = 0; i < NumElts; ++i) {
3928 SDValue V = Op.getOperand(i);
3929 if (V.getOpcode() == ISD::UNDEF)
3930 continue;
3931 if (i > 0)
3932 isOnlyLowElement = false;
3933 if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
3934 isConstant = false;
3935
3936 if (!Value.getNode())
3937 Value = V;
3938 else if (V != Value)
3939 usesOnlyOneValue = false;
3940 }
3941
3942 if (!Value.getNode())
3943 return DAG.getUNDEF(VT);
3944
3945 if (isOnlyLowElement)
3946 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value);
3947
3948 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
3949
3950 // Use VDUP for non-constant splats. For f32 constant splats, reduce to
3951 // i32 and try again.
3952 if (usesOnlyOneValue && EltSize <= 32) {
3953 if (!isConstant)
3954 return DAG.getNode(ARMISD::VDUP, dl, VT, Value);
3955 if (VT.getVectorElementType().isFloatingPoint()) {
3956 SmallVector<SDValue, 8> Ops;
3957 for (unsigned i = 0; i < NumElts; ++i)
3958 Ops.push_back(DAG.getNode(ISD::BITCAST, dl, MVT::i32,
3959 Op.getOperand(i)));
3960 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32, NumElts);
3961 SDValue Val = DAG.getNode(ISD::BUILD_VECTOR, dl, VecVT, &Ops[0], NumElts);
3962 Val = LowerBUILD_VECTOR(Val, DAG, ST);
3963 if (Val.getNode())
3964 return DAG.getNode(ISD::BITCAST, dl, VT, Val);
3965 }
3966 SDValue Val = IsSingleInstrConstant(Value, DAG, ST, dl);
3967 if (Val.getNode())
3968 return DAG.getNode(ARMISD::VDUP, dl, VT, Val);
3969 }
3970
3971 // If all elements are constants and the case above didn't get hit, fall back
3972 // to the default expansion, which will generate a load from the constant
3973 // pool.
3974 if (isConstant)
3975 return SDValue();
3976
3977 // Empirical tests suggest this is rarely worth it for vectors of length <= 2.
3978 if (NumElts >= 4) {
3979 SDValue shuffle = ReconstructShuffle(Op, DAG);
3980 if (shuffle != SDValue())
3981 return shuffle;
3982 }
3983
3984 // Vectors with 32- or 64-bit elements can be built by directly assigning
3985 // the subregisters. Lower it to an ARMISD::BUILD_VECTOR so the operands
3986 // will be legalized.
3987 if (EltSize >= 32) {
3988 // Do the expansion with floating-point types, since that is what the VFP
3989 // registers are defined to use, and since i64 is not legal.
3990 EVT EltVT = EVT::getFloatingPointVT(EltSize);
3991 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts);
3992 SmallVector<SDValue, 8> Ops;
3993 for (unsigned i = 0; i < NumElts; ++i)
3994 Ops.push_back(DAG.getNode(ISD::BITCAST, dl, EltVT, Op.getOperand(i)));
3995 SDValue Val = DAG.getNode(ARMISD::BUILD_VECTOR, dl, VecVT, &Ops[0],NumElts);
3996 return DAG.getNode(ISD::BITCAST, dl, VT, Val);
3997 }
3998
3999 return SDValue();
4000 }
4001
4002 // Gather data to see if the operation can be modelled as a
4003 // shuffle in combination with VEXTs.
4004 SDValue ARMTargetLowering::ReconstructShuffle(SDValue Op,
4005 SelectionDAG &DAG) const {
4006 DebugLoc dl = Op.getDebugLoc();
4007 EVT VT = Op.getValueType();
4008 unsigned NumElts = VT.getVectorNumElements();
4009
4010 SmallVector<SDValue, 2> SourceVecs;
4011 SmallVector<unsigned, 2> MinElts;
4012 SmallVector<unsigned, 2> MaxElts;
4013
4014 for (unsigned i = 0; i < NumElts; ++i) {
4015 SDValue V = Op.getOperand(i);
4016 if (V.getOpcode() == ISD::UNDEF)
4017 continue;
4018 else if (V.getOpcode() != ISD::EXTRACT_VECTOR_ELT) {
4019 // A shuffle can only come from building a vector from various
4020 // elements of other vectors.
4021 return SDValue();
4022 }
4023
4024 // Record this extraction against the appropriate vector if possible...
4025 SDValue SourceVec = V.getOperand(0);
4026 unsigned EltNo = cast<ConstantSDNode>(V.getOperand(1))->getZExtValue();
4027 bool FoundSource = false;
4028 for (unsigned j = 0; j < SourceVecs.size(); ++j) {
4029 if (SourceVecs[j] == SourceVec) {
4030 if (MinElts[j] > EltNo)
4031 MinElts[j] = EltNo;
4032 if (MaxElts[j] < EltNo)
4033 MaxElts[j] = EltNo;
4034 FoundSource = true;
4035 break;
4036 }
4037 }
4038
4039 // Or record a new source if not...
4040 if (!FoundSource) {
4041 SourceVecs.push_back(SourceVec);
4042 MinElts.push_back(EltNo);
4043 MaxElts.push_back(EltNo);
4044 }
4045 }
4046
4047 // Currently only do something sane when at most two source vectors
4048 // involved.
4049 if (SourceVecs.size() > 2)
4050 return SDValue();
4051
4052 SDValue ShuffleSrcs[2] = {DAG.getUNDEF(VT), DAG.getUNDEF(VT) };
4053 int VEXTOffsets[2] = {0, 0};
4054
4055 // This loop extracts the usage patterns of the source vectors
4056 // and prepares appropriate SDValues for a shuffle if possible.
4057 for (unsigned i = 0; i < SourceVecs.size(); ++i) {
4058 if (SourceVecs[i].getValueType() == VT) {
4059 // No VEXT necessary
4060 ShuffleSrcs[i] = SourceVecs[i];
4061 VEXTOffsets[i] = 0;
4062 continue;
4063 } else if (SourceVecs[i].getValueType().getVectorNumElements() < NumElts) {
4064 // It probably isn't worth padding out a smaller vector just to
4065 // break it down again in a shuffle.
4066 return SDValue();
4067 }
4068
4069 // Since only 64-bit and 128-bit vectors are legal on ARM and
4070 // we've eliminated the other cases...
4071 assert(SourceVecs[i].getValueType().getVectorNumElements() == 2*NumElts &&
4072 "unexpected vector sizes in ReconstructShuffle");
4073
4074 if (MaxElts[i] - MinElts[i] >= NumElts) {
4075 // Span too large for a VEXT to cope
4076 return SDValue();
4077 }
4078
4079 if (MinElts[i] >= NumElts) {
4080 // The extraction can just take the second half
4081 VEXTOffsets[i] = NumElts;
4082 ShuffleSrcs[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT,
4083 SourceVecs[i],
4084 DAG.getIntPtrConstant(NumElts));
4085 } else if (MaxElts[i] < NumElts) {
4086 // The extraction can just take the first half
4087 VEXTOffsets[i] = 0;
4088 ShuffleSrcs[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT,
4089 SourceVecs[i],
4090 DAG.getIntPtrConstant(0));
4091 } else {
4092 // An actual VEXT is needed
4093 VEXTOffsets[i] = MinElts[i];
4094 SDValue VEXTSrc1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT,
4095 SourceVecs[i],
4096 DAG.getIntPtrConstant(0));
4097 SDValue VEXTSrc2 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT,
4098 SourceVecs[i],
4099 DAG.getIntPtrConstant(NumElts));
4100 ShuffleSrcs[i] = DAG.getNode(ARMISD::VEXT, dl, VT, VEXTSrc1, VEXTSrc2,
4101 DAG.getConstant(VEXTOffsets[i], MVT::i32));
4102 }
4103 }
4104
4105 SmallVector<int, 8> Mask;
4106
4107 for (unsigned i = 0; i < NumElts; ++i) {
4108 SDValue Entry = Op.getOperand(i);
4109 if (Entry.getOpcode() == ISD::UNDEF) {
4110 Mask.push_back(-1);
4111 continue;
4112 }
4113
4114 SDValue ExtractVec = Entry.getOperand(0);
4115 int ExtractElt = cast<ConstantSDNode>(Op.getOperand(i)
4116 .getOperand(1))->getSExtValue();
4117 if (ExtractVec == SourceVecs[0]) {
4118 Mask.push_back(ExtractElt - VEXTOffsets[0]);
4119 } else {
4120 Mask.push_back(ExtractElt + NumElts - VEXTOffsets[1]);
4121 }
4122 }
4123
4124 // Final check before we try to produce nonsense...
4125 if (isShuffleMaskLegal(Mask, VT))
4126 return DAG.getVectorShuffle(VT, dl, ShuffleSrcs[0], ShuffleSrcs[1],
4127 &Mask[0]);
4128
4129 return SDValue();
4130 }
4131
4132 /// isShuffleMaskLegal - Targets can use this to indicate that they only
4133 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
4134 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
4135 /// are assumed to be legal.
4136 bool
4137 ARMTargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
4138 EVT VT) const {
4139 if (VT.getVectorNumElements() == 4 &&
4140 (VT.is128BitVector() || VT.is64BitVector())) {
4141 unsigned PFIndexes[4];
4142 for (unsigned i = 0; i != 4; ++i) {
4143 if (M[i] < 0)
4144 PFIndexes[i] = 8;
4145 else
4146 PFIndexes[i] = M[i];
4147 }
4148
4149 // Compute the index in the perfect shuffle table.
4150 unsigned PFTableIndex =
4151 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
4152 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
4153 unsigned Cost = (PFEntry >> 30);
4154
4155 if (Cost <= 4)
4156 return true;
4157 }
4158
4159 bool ReverseVEXT;
4160 unsigned Imm, WhichResult;
4161
4162 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
4163 return (EltSize >= 32 ||
4164 ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
4165 isVREVMask(M, VT, 64) ||
4166 isVREVMask(M, VT, 32) ||
4167 isVREVMask(M, VT, 16) ||
4168 isVEXTMask(M, VT, ReverseVEXT, Imm) ||
4169 isVTBLMask(M, VT) ||
4170 isVTRNMask(M, VT, WhichResult) ||
4171 isVUZPMask(M, VT, WhichResult) ||
4172 isVZIPMask(M, VT, WhichResult) ||
4173 isVTRN_v_undef_Mask(M, VT, WhichResult) ||
4174 isVUZP_v_undef_Mask(M, VT, WhichResult) ||
4175 isVZIP_v_undef_Mask(M, VT, WhichResult));
4176 }
4177
4178 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
4179 /// the specified operations to build the shuffle.
4180 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
4181 SDValue RHS, SelectionDAG &DAG,
4182 DebugLoc dl) {
4183 unsigned OpNum = (PFEntry >> 26) & 0x0F;
4184 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
4185 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
4186
4187 enum {
4188 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
4189 OP_VREV,
4190 OP_VDUP0,
4191 OP_VDUP1,
4192 OP_VDUP2,
4193 OP_VDUP3,
4194 OP_VEXT1,
4195 OP_VEXT2,
4196 OP_VEXT3,
4197 OP_VUZPL, // VUZP, left result
4198 OP_VUZPR, // VUZP, right result
4199 OP_VZIPL, // VZIP, left result
4200 OP_VZIPR, // VZIP, right result
4201 OP_VTRNL, // VTRN, left result
4202 OP_VTRNR // VTRN, right result
4203 };
4204
4205 if (OpNum == OP_COPY) {
4206 if (LHSID == (1*9+2)*9+3) return LHS;
4207 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
4208 return RHS;
4209 }
4210
4211 SDValue OpLHS, OpRHS;
4212 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
4213 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
4214 EVT VT = OpLHS.getValueType();
4215
4216 switch (OpNum) {
4217 default: llvm_unreachable("Unknown shuffle opcode!");
4218 case OP_VREV:
4219 // VREV divides the vector in half and swaps within the half.
4220 if (VT.getVectorElementType() == MVT::i32 ||
4221 VT.getVectorElementType() == MVT::f32)
4222 return DAG.getNode(ARMISD::VREV64, dl, VT, OpLHS);
4223 // vrev <4 x i16> -> VREV32
4224 if (VT.getVectorElementType() == MVT::i16)
4225 return DAG.getNode(ARMISD::VREV32, dl, VT, OpLHS);
4226 // vrev <4 x i8> -> VREV16
4227 assert(VT.getVectorElementType() == MVT::i8);
4228 return DAG.getNode(ARMISD::VREV16, dl, VT, OpLHS);
4229 case OP_VDUP0:
4230 case OP_VDUP1:
4231 case OP_VDUP2:
4232 case OP_VDUP3:
4233 return DAG.getNode(ARMISD::VDUPLANE, dl, VT,
4234 OpLHS, DAG.getConstant(OpNum-OP_VDUP0, MVT::i32));
4235 case OP_VEXT1:
4236 case OP_VEXT2:
4237 case OP_VEXT3:
4238 return DAG.getNode(ARMISD::VEXT, dl, VT,
4239 OpLHS, OpRHS,
4240 DAG.getConstant(OpNum-OP_VEXT1+1, MVT::i32));
4241 case OP_VUZPL:
4242 case OP_VUZPR:
4243 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
4244 OpLHS, OpRHS).getValue(OpNum-OP_VUZPL);
4245 case OP_VZIPL:
4246 case OP_VZIPR:
4247 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
4248 OpLHS, OpRHS).getValue(OpNum-OP_VZIPL);
4249 case OP_VTRNL:
4250 case OP_VTRNR:
4251 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
4252 OpLHS, OpRHS).getValue(OpNum-OP_VTRNL);
4253 }
4254 }
4255
4256 static SDValue LowerVECTOR_SHUFFLEv8i8(SDValue Op,
4257 SmallVectorImpl<int> &ShuffleMask,
4258 SelectionDAG &DAG) {
4259 // Check to see if we can use the VTBL instruction.
4260 SDValue V1 = Op.getOperand(0);
4261 SDValue V2 = Op.getOperand(1);
4262 DebugLoc DL = Op.getDebugLoc();
4263
4264 SmallVector<SDValue, 8> VTBLMask;
4265 for (SmallVectorImpl<int>::iterator
4266 I = ShuffleMask.begin(), E = ShuffleMask.end(); I != E; ++I)
4267 VTBLMask.push_back(DAG.getConstant(*I, MVT::i32));
4268
4269 if (V2.getNode()->getOpcode() == ISD::UNDEF)
4270 return DAG.getNode(ARMISD::VTBL1, DL, MVT::v8i8, V1,
4271 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i8,
4272 &VTBLMask[0], 8));
4273
4274 return DAG.getNode(ARMISD::VTBL2, DL, MVT::v8i8, V1, V2,
4275 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i8,
4276 &VTBLMask[0], 8));
4277 }
4278
4279 static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
4280 SDValue V1 = Op.getOperand(0);
4281 SDValue V2 = Op.getOperand(1);
4282 DebugLoc dl = Op.getDebugLoc();
4283 EVT VT = Op.getValueType();
4284 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
4285 SmallVector<int, 8> ShuffleMask;
4286
4287 // Convert shuffles that are directly supported on NEON to target-specific
4288 // DAG nodes, instead of keeping them as shuffles and matching them again
4289 // during code selection. This is more efficient and avoids the possibility
4290 // of inconsistencies between legalization and selection.
4291 // FIXME: floating-point vectors should be canonicalized to integer vectors
4292 // of the same time so that they get CSEd properly.
4293 SVN->getMask(ShuffleMask);
4294
4295 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
4296 if (EltSize <= 32) {
4297 if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) {
4298 int Lane = SVN->getSplatIndex();
4299 // If this is undef splat, generate it via "just" vdup, if possible.
4300 if (Lane == -1) Lane = 0;
4301
4302 if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) {
4303 return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0));
4304 }
4305 return DAG.getNode(ARMISD::VDUPLANE, dl, VT, V1,
4306 DAG.getConstant(Lane, MVT::i32));
4307 }
4308
4309 bool ReverseVEXT;
4310 unsigned Imm;
4311 if (isVEXTMask(ShuffleMask, VT, ReverseVEXT, Imm)) {
4312 if (ReverseVEXT)
4313 std::swap(V1, V2);
4314 return DAG.getNode(ARMISD::VEXT, dl, VT, V1, V2,
4315 DAG.getConstant(Imm, MVT::i32));
4316 }
4317
4318 if (isVREVMask(ShuffleMask, VT, 64))
4319 return DAG.getNode(ARMISD::VREV64, dl, VT, V1);
4320 if (isVREVMask(ShuffleMask, VT, 32))
4321 return DAG.getNode(ARMISD::VREV32, dl, VT, V1);
4322 if (isVREVMask(ShuffleMask, VT, 16))
4323 return DAG.getNode(ARMISD::VREV16, dl, VT, V1);
4324
4325 // Check for Neon shuffles that modify both input vectors in place.
4326 // If both results are used, i.e., if there are two shuffles with the same
4327 // source operands and with masks corresponding to both results of one of
4328 // these operations, DAG memoization will ensure that a single node is
4329 // used for both shuffles.
4330 unsigned WhichResult;
4331 if (isVTRNMask(ShuffleMask, VT, WhichResult))
4332 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
4333 V1, V2).getValue(WhichResult);
4334 if (isVUZPMask(ShuffleMask, VT, WhichResult))
4335 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
4336 V1, V2).getValue(WhichResult);
4337 if (isVZIPMask(ShuffleMask, VT, WhichResult))
4338 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
4339 V1, V2).getValue(WhichResult);
4340
4341 if (isVTRN_v_undef_Mask(ShuffleMask, VT, WhichResult))
4342 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
4343 V1, V1).getValue(WhichResult);
4344 if (isVUZP_v_undef_Mask(ShuffleMask, VT, WhichResult))
4345 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
4346 V1, V1).getValue(WhichResult);
4347 if (isVZIP_v_undef_Mask(ShuffleMask, VT, WhichResult))
4348 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
4349 V1, V1).getValue(WhichResult);
4350 }
4351
4352 // If the shuffle is not directly supported and it has 4 elements, use
4353 // the PerfectShuffle-generated table to synthesize it from other shuffles.
4354 unsigned NumElts = VT.getVectorNumElements();
4355 if (NumElts == 4) {
4356 unsigned PFIndexes[4];
4357 for (unsigned i = 0; i != 4; ++i) {
4358 if (ShuffleMask[i] < 0)
4359 PFIndexes[i] = 8;
4360 else
4361 PFIndexes[i] = ShuffleMask[i];
4362 }
4363
4364 // Compute the index in the perfect shuffle table.
4365 unsigned PFTableIndex =
4366 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
4367 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
4368 unsigned Cost = (PFEntry >> 30);
4369
4370 if (Cost <= 4)
4371 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
4372 }
4373
4374 // Implement shuffles with 32- or 64-bit elements as ARMISD::BUILD_VECTORs.
4375 if (EltSize >= 32) {
4376 // Do the expansion with floating-point types, since that is what the VFP
4377 // registers are defined to use, and since i64 is not legal.
4378 EVT EltVT = EVT::getFloatingPointVT(EltSize);
4379 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts);
4380 V1 = DAG.getNode(ISD::BITCAST, dl, VecVT, V1);
4381 V2 = DAG.getNode(ISD::BITCAST, dl, VecVT, V2);
4382 SmallVector<SDValue, 8> Ops;
4383 for (unsigned i = 0; i < NumElts; ++i) {
4384 if (ShuffleMask[i] < 0)
4385 Ops.push_back(DAG.getUNDEF(EltVT));
4386 else
4387 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
4388 ShuffleMask[i] < (int)NumElts ? V1 : V2,
4389 DAG.getConstant(ShuffleMask[i] & (NumElts-1),
4390 MVT::i32)));
4391 }
4392 SDValue Val = DAG.getNode(ARMISD::BUILD_VECTOR, dl, VecVT, &Ops[0],NumElts);
4393 return DAG.getNode(ISD::BITCAST, dl, VT, Val);
4394 }
4395
4396 if (VT == MVT::v8i8) {
4397 SDValue NewOp = LowerVECTOR_SHUFFLEv8i8(Op, ShuffleMask, DAG);
4398 if (NewOp.getNode())
4399 return NewOp;
4400 }
4401
4402 return SDValue();
4403 }
4404
4405 static SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) {
4406 // EXTRACT_VECTOR_ELT is legal only for immediate indexes.
4407 SDValue Lane = Op.getOperand(1);
4408 if (!isa<ConstantSDNode>(Lane))
4409 return SDValue();
4410
4411 SDValue Vec = Op.getOperand(0);
4412 if (Op.getValueType() == MVT::i32 &&
4413 Vec.getValueType().getVectorElementType().getSizeInBits() < 32) {
4414 DebugLoc dl = Op.getDebugLoc();
4415 return DAG.getNode(ARMISD::VGETLANEu, dl, MVT::i32, Vec, Lane);
4416 }
4417
4418 return Op;
4419 }
4420
4421 static SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
4422 // The only time a CONCAT_VECTORS operation can have legal types is when
4423 // two 64-bit vectors are concatenated to a 128-bit vector.
4424 assert(Op.getValueType().is128BitVector() && Op.getNumOperands() == 2 &&
4425 "unexpected CONCAT_VECTORS");
4426 DebugLoc dl = Op.getDebugLoc();
4427 SDValue Val = DAG.getUNDEF(MVT::v2f64);
4428 SDValue Op0 = Op.getOperand(0);
4429 SDValue Op1 = Op.getOperand(1);
4430 if (Op0.getOpcode() != ISD::UNDEF)
4431 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
4432 DAG.getNode(ISD::BITCAST, dl, MVT::f64, Op0),
4433 DAG.getIntPtrConstant(0));
4434 if (Op1.getOpcode() != ISD::UNDEF)
4435 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
4436 DAG.getNode(ISD::BITCAST, dl, MVT::f64, Op1),
4437 DAG.getIntPtrConstant(1));
4438 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Val);
4439 }
4440
4441 /// isExtendedBUILD_VECTOR - Check if N is a constant BUILD_VECTOR where each
4442 /// element has been zero/sign-extended, depending on the isSigned parameter,
4443 /// from an integer type half its size.
4444 static bool isExtendedBUILD_VECTOR(SDNode *N, SelectionDAG &DAG,
4445 bool isSigned) {
4446 // A v2i64 BUILD_VECTOR will have been legalized to a BITCAST from v4i32.
4447 EVT VT = N->getValueType(0);
4448 if (VT == MVT::v2i64 && N->getOpcode() == ISD::BITCAST) {
4449 SDNode *BVN = N->getOperand(0).getNode();
4450 if (BVN->getValueType(0) != MVT::v4i32 ||
4451 BVN->getOpcode() != ISD::BUILD_VECTOR)
4452 return false;
4453 unsigned LoElt = DAG.getTargetLoweringInfo().isBigEndian() ? 1 : 0;
4454 unsigned HiElt = 1 - LoElt;
4455 ConstantSDNode *Lo0 = dyn_cast<ConstantSDNode>(BVN->getOperand(LoElt));
4456 ConstantSDNode *Hi0 = dyn_cast<ConstantSDNode>(BVN->getOperand(HiElt));
4457 ConstantSDNode *Lo1 = dyn_cast<ConstantSDNode>(BVN->getOperand(LoElt+2));
4458 ConstantSDNode *Hi1 = dyn_cast<ConstantSDNode>(BVN->getOperand(HiElt+2));
4459 if (!Lo0 || !Hi0 || !Lo1 || !Hi1)
4460 return false;
4461 if (isSigned) {
4462 if (Hi0->getSExtValue() == Lo0->getSExtValue() >> 32 &&
4463 Hi1->getSExtValue() == Lo1->getSExtValue() >> 32)
4464 return true;
4465 } else {
4466 if (Hi0->isNullValue() && Hi1->isNullValue())
4467 return true;
4468 }
4469 return false;
4470 }
4471
4472 if (N->getOpcode() != ISD::BUILD_VECTOR)
4473 return false;
4474
4475 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
4476 SDNode *Elt = N->getOperand(i).getNode();
4477 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Elt)) {
4478 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
4479 unsigned HalfSize = EltSize / 2;
4480 if (isSigned) {
4481 int64_t SExtVal = C->getSExtValue();
4482 if ((SExtVal >> HalfSize) != (SExtVal >> EltSize))
4483 return false;
4484 } else {
4485 if ((C->getZExtValue() >> HalfSize) != 0)
4486 return false;
4487 }
4488 continue;
4489 }
4490 return false;
4491 }
4492
4493 return true;
4494 }
4495
4496 /// isSignExtended - Check if a node is a vector value that is sign-extended
4497 /// or a constant BUILD_VECTOR with sign-extended elements.
4498 static bool isSignExtended(SDNode *N, SelectionDAG &DAG) {
4499 if (N->getOpcode() == ISD::SIGN_EXTEND || ISD::isSEXTLoad(N))
4500 return true;
4501 if (isExtendedBUILD_VECTOR(N, DAG, true))
4502 return true;
4503 return false;
4504 }
4505
4506 /// isZeroExtended - Check if a node is a vector value that is zero-extended
4507 /// or a constant BUILD_VECTOR with zero-extended elements.
4508 static bool isZeroExtended(SDNode *N, SelectionDAG &DAG) {
4509 if (N->getOpcode() == ISD::ZERO_EXTEND || ISD::isZEXTLoad(N))
4510 return true;
4511 if (isExtendedBUILD_VECTOR(N, DAG, false))
4512 return true;
4513 return false;
4514 }
4515
4516 /// SkipExtension - For a node that is a SIGN_EXTEND, ZERO_EXTEND, extending
4517 /// load, or BUILD_VECTOR with extended elements, return the unextended value.
4518 static SDValue SkipExtension(SDNode *N, SelectionDAG &DAG) {
4519 if (N->getOpcode() == ISD::SIGN_EXTEND || N->getOpcode() == ISD::ZERO_EXTEND)
4520 return N->getOperand(0);
4521 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N))
4522 return DAG.getLoad(LD->getMemoryVT(), N->getDebugLoc(), LD->getChain(),
4523 LD->getBasePtr(), LD->getPointerInfo(), LD->isVolatile(),
4524 LD->isNonTemporal(), LD->getAlignment());
4525 // Otherwise, the value must be a BUILD_VECTOR. For v2i64, it will
4526 // have been legalized as a BITCAST from v4i32.
4527 if (N->getOpcode() == ISD::BITCAST) {
4528 SDNode *BVN = N->getOperand(0).getNode();
4529 assert(BVN->getOpcode() == ISD::BUILD_VECTOR &&
4530 BVN->getValueType(0) == MVT::v4i32 && "expected v4i32 BUILD_VECTOR");
4531 unsigned LowElt = DAG.getTargetLoweringInfo().isBigEndian() ? 1 : 0;
4532 return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(), MVT::v2i32,
4533 BVN->getOperand(LowElt), BVN->getOperand(LowElt+2));
4534 }
4535 // Construct a new BUILD_VECTOR with elements truncated to half the size.
4536 assert(N->getOpcode() == ISD::BUILD_VECTOR && "expected BUILD_VECTOR");
4537 EVT VT = N->getValueType(0);
4538 unsigned EltSize = VT.getVectorElementType().getSizeInBits() / 2;
4539 unsigned NumElts = VT.getVectorNumElements();
4540 MVT TruncVT = MVT::getIntegerVT(EltSize);
4541 SmallVector<SDValue, 8> Ops;
4542 for (unsigned i = 0; i != NumElts; ++i) {
4543 ConstantSDNode *C = cast<ConstantSDNode>(N->getOperand(i));
4544 const APInt &CInt = C->getAPIntValue();
4545 Ops.push_back(DAG.getConstant(CInt.trunc(EltSize), TruncVT));
4546 }
4547 return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(),
4548 MVT::getVectorVT(TruncVT, NumElts), Ops.data(), NumElts);
4549 }
4550
4551 static bool isAddSubSExt(SDNode *N, SelectionDAG &DAG) {
4552 unsigned Opcode = N->getOpcode();
4553 if (Opcode == ISD::ADD || Opcode == ISD::SUB) {
4554 SDNode *N0 = N->getOperand(0).getNode();
4555 SDNode *N1 = N->getOperand(1).getNode();
4556 return N0->hasOneUse() && N1->hasOneUse() &&
4557 isSignExtended(N0, DAG) && isSignExtended(N1, DAG);
4558 }
4559 return false;
4560 }
4561
4562 static bool isAddSubZExt(SDNode *N, SelectionDAG &DAG) {
4563 unsigned Opcode = N->getOpcode();
4564 if (Opcode == ISD::ADD || Opcode == ISD::SUB) {
4565 SDNode *N0 = N->getOperand(0).getNode();
4566 SDNode *N1 = N->getOperand(1).getNode();
4567 return N0->hasOneUse() && N1->hasOneUse() &&
4568 isZeroExtended(N0, DAG) && isZeroExtended(N1, DAG);
4569 }
4570 return false;
4571 }
4572
4573 static SDValue LowerMUL(SDValue Op, SelectionDAG &DAG) {
4574 // Multiplications are only custom-lowered for 128-bit vectors so that
4575 // VMULL can be detected. Otherwise v2i64 multiplications are not legal.
4576 EVT VT = Op.getValueType();
4577 assert(VT.is128BitVector() && "unexpected type for custom-lowering ISD::MUL");
4578 SDNode *N0 = Op.getOperand(0).getNode();
4579 SDNode *N1 = Op.getOperand(1).getNode();
4580 unsigned NewOpc = 0;
4581 bool isMLA = false;
4582 bool isN0SExt = isSignExtended(N0, DAG);
4583 bool isN1SExt = isSignExtended(N1, DAG);
4584 if (isN0SExt && isN1SExt)
4585 NewOpc = ARMISD::VMULLs;
4586 else {
4587 bool isN0ZExt = isZeroExtended(N0, DAG);
4588 bool isN1ZExt = isZeroExtended(N1, DAG);
4589 if (isN0ZExt && isN1ZExt)
4590 NewOpc = ARMISD::VMULLu;
4591 else if (isN1SExt || isN1ZExt) {
4592 // Look for (s/zext A + s/zext B) * (s/zext C). We want to turn these
4593 // into (s/zext A * s/zext C) + (s/zext B * s/zext C)
4594 if (isN1SExt && isAddSubSExt(N0, DAG)) {
4595 NewOpc = ARMISD::VMULLs;
4596 isMLA = true;
4597 } else if (isN1ZExt && isAddSubZExt(N0, DAG)) {
4598 NewOpc = ARMISD::VMULLu;
4599 isMLA = true;
4600 } else if (isN0ZExt && isAddSubZExt(N1, DAG)) {
4601 std::swap(N0, N1);
4602 NewOpc = ARMISD::VMULLu;
4603 isMLA = true;
4604 }
4605 }
4606
4607 if (!NewOpc) {
4608 if (VT == MVT::v2i64)
4609 // Fall through to expand this. It is not legal.
4610 return SDValue();
4611 else
4612 // Other vector multiplications are legal.
4613 return Op;
4614 }
4615 }
4616
4617 // Legalize to a VMULL instruction.
4618 DebugLoc DL = Op.getDebugLoc();
4619 SDValue Op0;
4620 SDValue Op1 = SkipExtension(N1, DAG);
4621 if (!isMLA) {
4622 Op0 = SkipExtension(N0, DAG);
4623 assert(Op0.getValueType().is64BitVector() &&
4624 Op1.getValueType().is64BitVector() &&
4625 "unexpected types for extended operands to VMULL");
4626 return DAG.getNode(NewOpc, DL, VT, Op0, Op1);
4627 }
4628
4629 // Optimizing (zext A + zext B) * C, to (VMULL A, C) + (VMULL B, C) during
4630 // isel lowering to take advantage of no-stall back to back vmul + vmla.
4631 // vmull q0, d4, d6
4632 // vmlal q0, d5, d6
4633 // is faster than
4634 // vaddl q0, d4, d5
4635 // vmovl q1, d6
4636 // vmul q0, q0, q1
4637 SDValue N00 = SkipExtension(N0->getOperand(0).getNode(), DAG);
4638 SDValue N01 = SkipExtension(N0->getOperand(1).getNode(), DAG);
4639 EVT Op1VT = Op1.getValueType();
4640 return DAG.getNode(N0->getOpcode(), DL, VT,
4641 DAG.getNode(NewOpc, DL, VT,
4642 DAG.getNode(ISD::BITCAST, DL, Op1VT, N00), Op1),
4643 DAG.getNode(NewOpc, DL, VT,
4644 DAG.getNode(ISD::BITCAST, DL, Op1VT, N01), Op1));
4645 }
4646
4647 static SDValue
4648 LowerSDIV_v4i8(SDValue X, SDValue Y, DebugLoc dl, SelectionDAG &DAG) {
4649 // Convert to float
4650 // float4 xf = vcvt_f32_s32(vmovl_s16(a.lo));
4651 // float4 yf = vcvt_f32_s32(vmovl_s16(b.lo));
4652 X = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v4i32, X);
4653 Y = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v4i32, Y);
4654 X = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::v4f32, X);
4655 Y = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::v4f32, Y);
4656 // Get reciprocal estimate.
4657 // float4 recip = vrecpeq_f32(yf);
4658 Y = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f32,
4659 DAG.getConstant(Intrinsic::arm_neon_vrecpe, MVT::i32), Y);
4660 // Because char has a smaller range than uchar, we can actually get away
4661 // without any newton steps. This requires that we use a weird bias
4662 // of 0xb000, however (again, this has been exhaustively tested).
4663 // float4 result = as_float4(as_int4(xf*recip) + 0xb000);
4664 X = DAG.getNode(ISD::FMUL, dl, MVT::v4f32, X, Y);
4665 X = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, X);
4666 Y = DAG.getConstant(0xb000, MVT::i32);
4667 Y = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Y, Y, Y, Y);
4668 X = DAG.getNode(ISD::ADD, dl, MVT::v4i32, X, Y);
4669 X = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, X);
4670 // Convert back to short.
4671 X = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::v4i32, X);
4672 X = DAG.getNode(ISD::TRUNCATE, dl, MVT::v4i16, X);
4673 return X;
4674 }
4675
4676 static SDValue
4677 LowerSDIV_v4i16(SDValue N0, SDValue N1, DebugLoc dl, SelectionDAG &DAG) {
4678 SDValue N2;
4679 // Convert to float.
4680 // float4 yf = vcvt_f32_s32(vmovl_s16(y));
4681 // float4 xf = vcvt_f32_s32(vmovl_s16(x));
4682 N0 = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v4i32, N0);
4683 N1 = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v4i32, N1);
4684 N0 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::v4f32, N0);
4685 N1 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::v4f32, N1);
4686
4687 // Use reciprocal estimate and one refinement step.
4688 // float4 recip = vrecpeq_f32(yf);
4689 // recip *= vrecpsq_f32(yf, recip);
4690 N2 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f32,
4691 DAG.getConstant(Intrinsic::arm_neon_vrecpe, MVT::i32), N1);
4692 N1 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f32,
4693 DAG.getConstant(Intrinsic::arm_neon_vrecps, MVT::i32),
4694 N1, N2);
4695 N2 = DAG.getNode(ISD::FMUL, dl, MVT::v4f32, N1, N2);
4696 // Because short has a smaller range than ushort, we can actually get away
4697 // with only a single newton step. This requires that we use a weird bias
4698 // of 89, however (again, this has been exhaustively tested).
4699 // float4 result = as_float4(as_int4(xf*recip) + 0x89);
4700 N0 = DAG.getNode(ISD::FMUL, dl, MVT::v4f32, N0, N2);
4701 N0 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, N0);
4702 N1 = DAG.getConstant(0x89, MVT::i32);
4703 N1 = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, N1, N1, N1, N1);
4704 N0 = DAG.getNode(ISD::ADD, dl, MVT::v4i32, N0, N1);
4705 N0 = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, N0);
4706 // Convert back to integer and return.
4707 // return vmovn_s32(vcvt_s32_f32(result));
4708 N0 = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::v4i32, N0);
4709 N0 = DAG.getNode(ISD::TRUNCATE, dl, MVT::v4i16, N0);
4710 return N0;
4711 }
4712
4713 static SDValue LowerSDIV(SDValue Op, SelectionDAG &DAG) {
4714 EVT VT = Op.getValueType();
4715 assert((VT == MVT::v4i16 || VT == MVT::v8i8) &&
4716 "unexpected type for custom-lowering ISD::SDIV");
4717
4718 DebugLoc dl = Op.getDebugLoc();
4719 SDValue N0 = Op.getOperand(0);
4720 SDValue N1 = Op.getOperand(1);
4721 SDValue N2, N3;
4722
4723 if (VT == MVT::v8i8) {
4724 N0 = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v8i16, N0);
4725 N1 = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v8i16, N1);
4726
4727 N2 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N0,
4728 DAG.getIntPtrConstant(4));
4729 N3 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N1,
4730 DAG.getIntPtrConstant(4));
4731 N0 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N0,
4732 DAG.getIntPtrConstant(0));
4733 N1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N1,
4734 DAG.getIntPtrConstant(0));
4735
4736 N0 = LowerSDIV_v4i8(N0, N1, dl, DAG); // v4i16
4737 N2 = LowerSDIV_v4i8(N2, N3, dl, DAG); // v4i16
4738
4739 N0 = DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v8i16, N0, N2);
4740 N0 = LowerCONCAT_VECTORS(N0, DAG);
4741
4742 N0 = DAG.getNode(ISD::TRUNCATE, dl, MVT::v8i8, N0);
4743 return N0;
4744 }
4745 return LowerSDIV_v4i16(N0, N1, dl, DAG);
4746 }
4747
4748 static SDValue LowerUDIV(SDValue Op, SelectionDAG &DAG) {
4749 EVT VT = Op.getValueType();
4750 assert((VT == MVT::v4i16 || VT == MVT::v8i8) &&
4751 "unexpected type for custom-lowering ISD::UDIV");
4752
4753 DebugLoc dl = Op.getDebugLoc();
4754 SDValue N0 = Op.getOperand(0);
4755 SDValue N1 = Op.getOperand(1);
4756 SDValue N2, N3;
4757
4758 if (VT == MVT::v8i8) {
4759 N0 = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v8i16, N0);
4760 N1 = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v8i16, N1);
4761
4762 N2 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N0,
4763 DAG.getIntPtrConstant(4));
4764 N3 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N1,
4765 DAG.getIntPtrConstant(4));
4766 N0 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N0,
4767 DAG.getIntPtrConstant(0));
4768 N1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i16, N1,
4769 DAG.getIntPtrConstant(0));
4770
4771 N0 = LowerSDIV_v4i16(N0, N1, dl, DAG); // v4i16
4772 N2 = LowerSDIV_v4i16(N2, N3, dl, DAG); // v4i16
4773
4774 N0 = DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v8i16, N0, N2);
4775 N0 = LowerCONCAT_VECTORS(N0, DAG);
4776
4777 N0 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v8i8,
4778 DAG.getConstant(Intrinsic::arm_neon_vqmovnsu, MVT::i32),
4779 N0);
4780 return N0;
4781 }
4782
4783 // v4i16 sdiv ... Convert to float.
4784 // float4 yf = vcvt_f32_s32(vmovl_u16(y));
4785 // float4 xf = vcvt_f32_s32(vmovl_u16(x));
4786 N0 = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v4i32, N0);
4787 N1 = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v4i32, N1);
4788 N0 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::v4f32, N0);
4789 SDValue BN1 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::v4f32, N1);
4790
4791 // Use reciprocal estimate and two refinement steps.
4792 // float4 recip = vrecpeq_f32(yf);
4793 // recip *= vrecpsq_f32(yf, recip);
4794 // recip *= vrecpsq_f32(yf, recip);
4795 N2 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f32,
4796 DAG.getConstant(Intrinsic::arm_neon_vrecpe, MVT::i32), BN1);
4797 N1 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f32,
4798 DAG.getConstant(Intrinsic::arm_neon_vrecps, MVT::i32),
4799 BN1, N2);
4800 N2 = DAG.getNode(ISD::FMUL, dl, MVT::v4f32, N1, N2);
4801 N1 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f32,
4802 DAG.getConstant(Intrinsic::arm_neon_vrecps, MVT::i32),
4803 BN1, N2);
4804 N2 = DAG.getNode(ISD::FMUL, dl, MVT::v4f32, N1, N2);
4805 // Simply multiplying by the reciprocal estimate can leave us a few ulps
4806 // too low, so we add 2 ulps (exhaustive testing shows that this is enough,
4807 // and that it will never cause us to return an answer too large).
4808 // float4 result = as_float4(as_int4(xf*recip) + 2);
4809 N0 = DAG.getNode(ISD::FMUL, dl, MVT::v4f32, N0, N2);
4810 N0 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, N0);
4811 N1 = DAG.getConstant(2, MVT::i32);
4812 N1 = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, N1, N1, N1, N1);
4813 N0 = DAG.getNode(ISD::ADD, dl, MVT::v4i32, N0, N1);
4814 N0 = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, N0);
4815 // Convert back to integer and return.
4816 // return vmovn_u32(vcvt_s32_f32(result));
4817 N0 = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::v4i32, N0);
4818 N0 = DAG.getNode(ISD::TRUNCATE, dl, MVT::v4i16, N0);
4819 return N0;
4820 }
4821
4822 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
4823 switch (Op.getOpcode()) {
4824 default: llvm_unreachable("Don't know how to custom lower this!");
4825 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
4826 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
4827 case ISD::GlobalAddress:
4828 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
4829 LowerGlobalAddressELF(Op, DAG);
4830 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
4831 case ISD::SELECT: return LowerSELECT(Op, DAG);
4832 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
4833 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
4834 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
4835 case ISD::VASTART: return LowerVASTART(Op, DAG);
4836 case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG, Subtarget);
4837 case ISD::PREFETCH: return LowerPREFETCH(Op, DAG, Subtarget);
4838 case ISD::SINT_TO_FP:
4839 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
4840 case ISD::FP_TO_SINT:
4841 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
4842 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
4843 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
4844 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
4845 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
4846 case ISD::EH_SJLJ_SETJMP: return LowerEH_SJLJ_SETJMP(Op, DAG);
4847 case ISD::EH_SJLJ_LONGJMP: return LowerEH_SJLJ_LONGJMP(Op, DAG);
4848 case ISD::EH_SJLJ_DISPATCHSETUP: return LowerEH_SJLJ_DISPATCHSETUP(Op, DAG);
4849 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG,
4850 Subtarget);
4851 case ISD::BITCAST: return ExpandBITCAST(Op.getNode(), DAG);
4852 case ISD::SHL:
4853 case ISD::SRL:
4854 case ISD::SRA: return LowerShift(Op.getNode(), DAG, Subtarget);
4855 case ISD::SHL_PARTS: return LowerShiftLeftParts(Op, DAG);
4856 case ISD::SRL_PARTS:
4857 case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG);
4858 case ISD::CTTZ: return LowerCTTZ(Op.getNode(), DAG, Subtarget);
4859 case ISD::VSETCC: return LowerVSETCC(Op, DAG);
4860 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG, Subtarget);
4861 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
4862 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
4863 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
4864 case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
4865 case ISD::MUL: return LowerMUL(Op, DAG);
4866 case ISD::SDIV: return LowerSDIV(Op, DAG);
4867 case ISD::UDIV: return LowerUDIV(Op, DAG);
4868 }
4869 return SDValue();
4870 }
4871
4872 /// ReplaceNodeResults - Replace the results of node with an illegal result
4873 /// type with new values built out of custom code.
4874 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
4875 SmallVectorImpl<SDValue>&Results,
4876 SelectionDAG &DAG) const {
4877 SDValue Res;
4878 switch (N->getOpcode()) {
4879 default:
4880 llvm_unreachable("Don't know how to custom expand this!");
4881 break;
4882 case ISD::BITCAST:
4883 Res = ExpandBITCAST(N, DAG);
4884 break;
4885 case ISD::SRL:
4886 case ISD::SRA:
4887 Res = Expand64BitShift(N, DAG, Subtarget);
4888 break;
4889 }
4890 if (Res.getNode())
4891 Results.push_back(Res);
4892 }
4893
4894 //===----------------------------------------------------------------------===//
4895 // ARM Scheduler Hooks
4896 //===----------------------------------------------------------------------===//
4897
4898 MachineBasicBlock *
4899 ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI,
4900 MachineBasicBlock *BB,
4901 unsigned Size) const {
4902 unsigned dest = MI->getOperand(0).getReg();
4903 unsigned ptr = MI->getOperand(1).getReg();
4904 unsigned oldval = MI->getOperand(2).getReg();
4905 unsigned newval = MI->getOperand(3).getReg();
4906 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
4907 DebugLoc dl = MI->getDebugLoc();
4908 bool isThumb2 = Subtarget->isThumb2();
4909
4910 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
4911 unsigned scratch =
4912 MRI.createVirtualRegister(isThumb2 ? ARM::rGPRRegisterClass
4913 : ARM::GPRRegisterClass);
4914
4915 if (isThumb2) {
4916 MRI.constrainRegClass(dest, ARM::rGPRRegisterClass);
4917 MRI.constrainRegClass(oldval, ARM::rGPRRegisterClass);
4918 MRI.constrainRegClass(newval, ARM::rGPRRegisterClass);
4919 }
4920
4921 unsigned ldrOpc, strOpc;
4922 switch (Size) {
4923 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
4924 case 1:
4925 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
4926 strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB;
4927 break;
4928 case 2:
4929 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
4930 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
4931 break;
4932 case 4:
4933 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
4934 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
4935 break;
4936 }
4937
4938 MachineFunction *MF = BB->getParent();
4939 const BasicBlock *LLVM_BB = BB->getBasicBlock();
4940 MachineFunction::iterator It = BB;
4941 ++It; // insert the new blocks after the current block
4942
4943 MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
4944 MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
4945 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
4946 MF->insert(It, loop1MBB);
4947 MF->insert(It, loop2MBB);
4948 MF->insert(It, exitMBB);
4949
4950 // Transfer the remainder of BB and its successor edges to exitMBB.
4951 exitMBB->splice(exitMBB->begin(), BB,
4952 llvm::next(MachineBasicBlock::iterator(MI)),
4953 BB->end());
4954 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
4955
4956 // thisMBB:
4957 // ...
4958 // fallthrough --> loop1MBB
4959 BB->addSuccessor(loop1MBB);
4960
4961 // loop1MBB:
4962 // ldrex dest, [ptr]
4963 // cmp dest, oldval
4964 // bne exitMBB
4965 BB = loop1MBB;
4966 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
4967 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr))
4968 .addReg(dest).addReg(oldval));
4969 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
4970 .addMBB(exitMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
4971 BB->addSuccessor(loop2MBB);
4972 BB->addSuccessor(exitMBB);
4973
4974 // loop2MBB:
4975 // strex scratch, newval, [ptr]
4976 // cmp scratch, #0
4977 // bne loop1MBB
4978 BB = loop2MBB;
4979 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(newval)
4980 .addReg(ptr));
4981 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
4982 .addReg(scratch).addImm(0));
4983 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
4984 .addMBB(loop1MBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
4985 BB->addSuccessor(loop1MBB);
4986 BB->addSuccessor(exitMBB);
4987
4988 // exitMBB:
4989 // ...
4990 BB = exitMBB;
4991
4992 MI->eraseFromParent(); // The instruction is gone now.
4993
4994 return BB;
4995 }
4996
4997 MachineBasicBlock *
4998 ARMTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
4999 unsigned Size, unsigned BinOpcode) const {
5000 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
5001 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
5002
5003 const BasicBlock *LLVM_BB = BB->getBasicBlock();
5004 MachineFunction *MF = BB->getParent();
5005 MachineFunction::iterator It = BB;
5006 ++It;
5007
5008 unsigned dest = MI->getOperand(0).getReg();
5009 unsigned ptr = MI->getOperand(1).getReg();
5010 unsigned incr = MI->getOperand(2).getReg();
5011 DebugLoc dl = MI->getDebugLoc();
5012 bool isThumb2 = Subtarget->isThumb2();
5013
5014 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
5015 if (isThumb2) {
5016 MRI.constrainRegClass(dest, ARM::rGPRRegisterClass);
5017 MRI.constrainRegClass(ptr, ARM::rGPRRegisterClass);
5018 }
5019
5020 unsigned ldrOpc, strOpc;
5021 switch (Size) {
5022 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
5023 case 1:
5024 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
5025 strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB;
5026 break;
5027 case 2:
5028 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
5029 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
5030 break;
5031 case 4:
5032 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
5033 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
5034 break;
5035 }
5036
5037 MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
5038 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
5039 MF->insert(It, loopMBB);
5040 MF->insert(It, exitMBB);
5041
5042 // Transfer the remainder of BB and its successor edges to exitMBB.
5043 exitMBB->splice(exitMBB->begin(), BB,
5044 llvm::next(MachineBasicBlock::iterator(MI)),
5045 BB->end());
5046 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
5047
5048 TargetRegisterClass *TRC =
5049 isThumb2 ? ARM::tGPRRegisterClass : ARM::GPRRegisterClass;
5050 unsigned scratch = MRI.createVirtualRegister(TRC);
5051 unsigned scratch2 = (!BinOpcode) ? incr : MRI.createVirtualRegister(TRC);
5052
5053 // thisMBB:
5054 // ...
5055 // fallthrough --> loopMBB
5056 BB->addSuccessor(loopMBB);
5057
5058 // loopMBB:
5059 // ldrex dest, ptr
5060 // <binop> scratch2, dest, incr
5061 // strex scratch, scratch2, ptr
5062 // cmp scratch, #0
5063 // bne- loopMBB
5064 // fallthrough --> exitMBB
5065 BB = loopMBB;
5066 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
5067 if (BinOpcode) {
5068 // operand order needs to go the other way for NAND
5069 if (BinOpcode == ARM::BICrr || BinOpcode == ARM::t2BICrr)
5070 AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2).
5071 addReg(incr).addReg(dest)).addReg(0);
5072 else
5073 AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2).
5074 addReg(dest).addReg(incr)).addReg(0);
5075 }
5076
5077 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(scratch2)
5078 .addReg(ptr));
5079 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
5080 .addReg(scratch).addImm(0));
5081 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
5082 .addMBB(loopMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
5083
5084 BB->addSuccessor(loopMBB);
5085 BB->addSuccessor(exitMBB);
5086
5087 // exitMBB:
5088 // ...
5089 BB = exitMBB;
5090
5091 MI->eraseFromParent(); // The instruction is gone now.
5092
5093 return BB;
5094 }
5095
5096 MachineBasicBlock *
5097 ARMTargetLowering::EmitAtomicBinaryMinMax(MachineInstr *MI,
5098 MachineBasicBlock *BB,
5099 unsigned Size,
5100 bool signExtend,
5101 ARMCC::CondCodes Cond) const {
5102 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
5103
5104 const BasicBlock *LLVM_BB = BB->getBasicBlock();
5105 MachineFunction *MF = BB->getParent();
5106 MachineFunction::iterator It = BB;
5107 ++It;
5108
5109 unsigned dest = MI->getOperand(0).getReg();
5110 unsigned ptr = MI->getOperand(1).getReg();
5111 unsigned incr = MI->getOperand(2).getReg();
5112 unsigned oldval = dest;
5113 DebugLoc dl = MI->getDebugLoc();
5114 bool isThumb2 = Subtarget->isThumb2();
5115
5116 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
5117 if (isThumb2) {
5118 MRI.constrainRegClass(dest, ARM::rGPRRegisterClass);
5119 MRI.constrainRegClass(ptr, ARM::rGPRRegisterClass);
5120 }
5121
5122 unsigned ldrOpc, strOpc, extendOpc;
5123 switch (Size) {
5124 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
5125 case 1:
5126 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
5127 strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB;
5128 extendOpc = isThumb2 ? ARM::t2SXTBr : ARM::SXTBr;
5129 break;
5130 case 2:
5131 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
5132 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
5133 extendOpc = isThumb2 ? ARM::t2SXTHr : ARM::SXTHr;
5134 break;
5135 case 4:
5136 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
5137 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
5138 extendOpc = 0;
5139 break;
5140 }
5141
5142 MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
5143 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
5144 MF->insert(It, loopMBB);
5145 MF->insert(It, exitMBB);
5146
5147 // Transfer the remainder of BB and its successor edges to exitMBB.
5148 exitMBB->splice(exitMBB->begin(), BB,
5149 llvm::next(MachineBasicBlock::iterator(MI)),
5150 BB->end());
5151 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
5152
5153 TargetRegisterClass *TRC =
5154 isThumb2 ? ARM::tGPRRegisterClass : ARM::GPRRegisterClass;
5155 unsigned scratch = MRI.createVirtualRegister(TRC);
5156 unsigned scratch2 = MRI.createVirtualRegister(TRC);
5157
5158 // thisMBB:
5159 // ...
5160 // fallthrough --> loopMBB
5161 BB->addSuccessor(loopMBB);
5162
5163 // loopMBB:
5164 // ldrex dest, ptr
5165 // (sign extend dest, if required)
5166 // cmp dest, incr
5167 // cmov.cond scratch2, dest, incr
5168 // strex scratch, scratch2, ptr
5169 // cmp scratch, #0
5170 // bne- loopMBB
5171 // fallthrough --> exitMBB
5172 BB = loopMBB;
5173 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
5174
5175 // Sign extend the value, if necessary.
5176 if (signExtend && extendOpc) {
5177 oldval = MRI.createVirtualRegister(ARM::GPRRegisterClass);
5178 AddDefaultPred(BuildMI(BB, dl, TII->get(extendOpc), oldval).addReg(dest));
5179 }
5180
5181 // Build compare and cmov instructions.
5182 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr))
5183 .addReg(oldval).addReg(incr));
5184 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2MOVCCr : ARM::MOVCCr), scratch2)
5185 .addReg(oldval).addReg(incr).addImm(Cond).addReg(ARM::CPSR);
5186
5187 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(scratch2)
5188 .addReg(ptr));
5189 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
5190 .addReg(scratch).addImm(0));
5191 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
5192 .addMBB(loopMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
5193
5194 BB->addSuccessor(loopMBB);
5195 BB->addSuccessor(exitMBB);
5196
5197 // exitMBB:
5198 // ...
5199 BB = exitMBB;
5200
5201 MI->eraseFromParent(); // The instruction is gone now.
5202
5203 return BB;
5204 }
5205
5206 static
5207 MachineBasicBlock *OtherSucc(MachineBasicBlock *MBB, MachineBasicBlock *Succ) {
5208 for (MachineBasicBlock::succ_iterator I = MBB->succ_begin(),
5209 E = MBB->succ_end(); I != E; ++I)
5210 if (*I != Succ)
5211 return *I;
5212 llvm_unreachable("Expecting a BB with two successors!");
5213 }
5214
5215 // FIXME: This opcode table should obviously be expressed in the target
5216 // description. We probably just need a "machine opcode" value in the pseudo
5217 // instruction. But the ideal solution maybe to simply remove the "S" version
5218 // of the opcode altogether.
5219 struct AddSubFlagsOpcodePair {
5220 unsigned PseudoOpc;
5221 unsigned MachineOpc;
5222 };
5223
5224 static AddSubFlagsOpcodePair AddSubFlagsOpcodeMap[] = {
5225 {ARM::ADCSri, ARM::ADCri},
5226 {ARM::ADCSrr, ARM::ADCrr},
5227 {ARM::ADCSrs, ARM::ADCrs},
5228 {ARM::SBCSri, ARM::SBCri},
5229 {ARM::SBCSrr, ARM::SBCrr},
5230 {ARM::SBCSrs, ARM::SBCrs},
5231 {ARM::RSBSri, ARM::RSBri},
5232 {ARM::RSBSrr, ARM::RSBrr},
5233 {ARM::RSBSrs, ARM::RSBrs},
5234 {ARM::RSCSri, ARM::RSCri},
5235 {ARM::RSCSrs, ARM::RSCrs},
5236 {ARM::t2ADCSri, ARM::t2ADCri},
5237 {ARM::t2ADCSrr, ARM::t2ADCrr},
5238 {ARM::t2ADCSrs, ARM::t2ADCrs},
5239 {ARM::t2SBCSri, ARM::t2SBCri},
5240 {ARM::t2SBCSrr, ARM::t2SBCrr},
5241 {ARM::t2SBCSrs, ARM::t2SBCrs},
5242 {ARM::t2RSBSri, ARM::t2RSBri},
5243 {ARM::t2RSBSrs, ARM::t2RSBrs},
5244 };
5245
5246 // Convert and Add or Subtract with Carry and Flags to a generic opcode with
5247 // CPSR<def> operand. e.g. ADCS (...) -> ADC (... CPSR<def>).
5248 //
5249 // FIXME: Somewhere we should assert that CPSR<def> is in the correct
5250 // position to be recognized by the target descrition as the 'S' bit.
5251 bool ARMTargetLowering::RemapAddSubWithFlags(MachineInstr *MI,
5252 MachineBasicBlock *BB) const {
5253 unsigned OldOpc = MI->getOpcode();
5254 unsigned NewOpc = 0;
5255
5256 // This is only called for instructions that need remapping, so iterating over
5257 // the tiny opcode table is not costly.
5258 static const int NPairs =
5259 sizeof(AddSubFlagsOpcodeMap) / sizeof(AddSubFlagsOpcodePair);
5260 for (AddSubFlagsOpcodePair *Pair = &AddSubFlagsOpcodeMap[0],
5261 *End = &AddSubFlagsOpcodeMap[NPairs]; Pair != End; ++Pair) {
5262 if (OldOpc == Pair->PseudoOpc) {
5263 NewOpc = Pair->MachineOpc;
5264 break;
5265 }
5266 }
5267 if (!NewOpc)
5268 return false;
5269
5270 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
5271 DebugLoc dl = MI->getDebugLoc();
5272 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(NewOpc));
5273 for (unsigned i = 0; i < MI->getNumOperands(); ++i)
5274 MIB.addOperand(MI->getOperand(i));
5275 AddDefaultPred(MIB);
5276 MIB.addReg(ARM::CPSR, RegState::Define); // S bit
5277 MI->eraseFromParent();
5278 return true;
5279 }
5280
5281 MachineBasicBlock *
5282 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
5283 MachineBasicBlock *BB) const {
5284 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
5285 DebugLoc dl = MI->getDebugLoc();
5286 bool isThumb2 = Subtarget->isThumb2();
5287 switch (MI->getOpcode()) {
5288 default: {
5289 if (RemapAddSubWithFlags(MI, BB))
5290 return BB;
5291
5292 MI->dump();
5293 llvm_unreachable("Unexpected instr type to insert");
5294 }
5295 case ARM::ATOMIC_LOAD_ADD_I8:
5296 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
5297 case ARM::ATOMIC_LOAD_ADD_I16:
5298 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
5299 case ARM::ATOMIC_LOAD_ADD_I32:
5300 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
5301
5302 case ARM::ATOMIC_LOAD_AND_I8:
5303 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
5304 case ARM::ATOMIC_LOAD_AND_I16:
5305 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
5306 case ARM::ATOMIC_LOAD_AND_I32:
5307 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
5308
5309 case ARM::ATOMIC_LOAD_OR_I8:
5310 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
5311 case ARM::ATOMIC_LOAD_OR_I16:
5312 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
5313 case ARM::ATOMIC_LOAD_OR_I32:
5314 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
5315
5316 case ARM::ATOMIC_LOAD_XOR_I8:
5317 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
5318 case ARM::ATOMIC_LOAD_XOR_I16:
5319 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
5320 case ARM::ATOMIC_LOAD_XOR_I32:
5321 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
5322
5323 case ARM::ATOMIC_LOAD_NAND_I8:
5324 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
5325 case ARM::ATOMIC_LOAD_NAND_I16:
5326 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
5327 case ARM::ATOMIC_LOAD_NAND_I32:
5328 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
5329
5330 case ARM::ATOMIC_LOAD_SUB_I8:
5331 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
5332 case ARM::ATOMIC_LOAD_SUB_I16:
5333 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
5334 case ARM::ATOMIC_LOAD_SUB_I32:
5335 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
5336
5337 case ARM::ATOMIC_LOAD_MIN_I8:
5338 return EmitAtomicBinaryMinMax(MI, BB, 1, true, ARMCC::LT);
5339 case ARM::ATOMIC_LOAD_MIN_I16:
5340 return EmitAtomicBinaryMinMax(MI, BB, 2, true, ARMCC::LT);
5341 case ARM::ATOMIC_LOAD_MIN_I32:
5342 return EmitAtomicBinaryMinMax(MI, BB, 4, true, ARMCC::LT);
5343
5344 case ARM::ATOMIC_LOAD_MAX_I8:
5345 return EmitAtomicBinaryMinMax(MI, BB, 1, true, ARMCC::GT);
5346 case ARM::ATOMIC_LOAD_MAX_I16:
5347 return EmitAtomicBinaryMinMax(MI, BB, 2, true, ARMCC::GT);
5348 case ARM::ATOMIC_LOAD_MAX_I32:
5349 return EmitAtomicBinaryMinMax(MI, BB, 4, true, ARMCC::GT);
5350
5351 case ARM::ATOMIC_LOAD_UMIN_I8:
5352 return EmitAtomicBinaryMinMax(MI, BB, 1, false, ARMCC::LO);
5353 case ARM::ATOMIC_LOAD_UMIN_I16:
5354 return EmitAtomicBinaryMinMax(MI, BB, 2, false, ARMCC::LO);
5355 case ARM::ATOMIC_LOAD_UMIN_I32:
5356 return EmitAtomicBinaryMinMax(MI, BB, 4, false, ARMCC::LO);
5357
5358 case ARM::ATOMIC_LOAD_UMAX_I8:
5359 return EmitAtomicBinaryMinMax(MI, BB, 1, false, ARMCC::HI);
5360 case ARM::ATOMIC_LOAD_UMAX_I16:
5361 return EmitAtomicBinaryMinMax(MI, BB, 2, false, ARMCC::HI);
5362 case ARM::ATOMIC_LOAD_UMAX_I32:
5363 return EmitAtomicBinaryMinMax(MI, BB, 4, false, ARMCC::HI);
5364
5365 case ARM::ATOMIC_SWAP_I8: return EmitAtomicBinary(MI, BB, 1, 0);
5366 case ARM::ATOMIC_SWAP_I16: return EmitAtomicBinary(MI, BB, 2, 0);
5367 case ARM::ATOMIC_SWAP_I32: return EmitAtomicBinary(MI, BB, 4, 0);
5368
5369 case ARM::ATOMIC_CMP_SWAP_I8: return EmitAtomicCmpSwap(MI, BB, 1);
5370 case ARM::ATOMIC_CMP_SWAP_I16: return EmitAtomicCmpSwap(MI, BB, 2);
5371 case ARM::ATOMIC_CMP_SWAP_I32: return EmitAtomicCmpSwap(MI, BB, 4);
5372
5373 case ARM::tMOVCCr_pseudo: {
5374 // To "insert" a SELECT_CC instruction, we actually have to insert the
5375 // diamond control-flow pattern. The incoming instruction knows the
5376 // destination vreg to set, the condition code register to branch on, the
5377 // true/false values to select between, and a branch opcode to use.
5378 const BasicBlock *LLVM_BB = BB->getBasicBlock();
5379 MachineFunction::iterator It = BB;
5380 ++It;
5381
5382 // thisMBB:
5383 // ...
5384 // TrueVal = ...
5385 // cmpTY ccX, r1, r2
5386 // bCC copy1MBB
5387 // fallthrough --> copy0MBB
5388 MachineBasicBlock *thisMBB = BB;
5389 MachineFunction *F = BB->getParent();
5390 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
5391 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
5392 F->insert(It, copy0MBB);
5393 F->insert(It, sinkMBB);
5394
5395 // Transfer the remainder of BB and its successor edges to sinkMBB.
5396 sinkMBB->splice(sinkMBB->begin(), BB,
5397 llvm::next(MachineBasicBlock::iterator(MI)),
5398 BB->end());
5399 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
5400
5401 BB->addSuccessor(copy0MBB);
5402 BB->addSuccessor(sinkMBB);
5403
5404 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
5405 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
5406
5407 // copy0MBB:
5408 // %FalseValue = ...
5409 // # fallthrough to sinkMBB
5410 BB = copy0MBB;
5411
5412 // Update machine-CFG edges
5413 BB->addSuccessor(sinkMBB);
5414
5415 // sinkMBB:
5416 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
5417 // ...
5418 BB = sinkMBB;
5419 BuildMI(*BB, BB->begin(), dl,
5420 TII->get(ARM::PHI), MI->getOperand(0).getReg())
5421 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
5422 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
5423
5424 MI->eraseFromParent(); // The pseudo instruction is gone now.
5425 return BB;
5426 }
5427
5428 case ARM::BCCi64:
5429 case ARM::BCCZi64: {
5430 // If there is an unconditional branch to the other successor, remove it.
5431 BB->erase(llvm::next(MachineBasicBlock::iterator(MI)), BB->end());
5432
5433 // Compare both parts that make up the double comparison separately for
5434 // equality.
5435 bool RHSisZero = MI->getOpcode() == ARM::BCCZi64;
5436
5437 unsigned LHS1 = MI->getOperand(1).getReg();
5438 unsigned LHS2 = MI->getOperand(2).getReg();
5439 if (RHSisZero) {
5440 AddDefaultPred(BuildMI(BB, dl,
5441 TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
5442 .addReg(LHS1).addImm(0));
5443 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
5444 .addReg(LHS2).addImm(0)
5445 .addImm(ARMCC::EQ).addReg(ARM::CPSR);
5446 } else {
5447 unsigned RHS1 = MI->getOperand(3).getReg();
5448 unsigned RHS2 = MI->getOperand(4).getReg();
5449 AddDefaultPred(BuildMI(BB, dl,
5450 TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr))
5451 .addReg(LHS1).addReg(RHS1));
5452 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr))
5453 .addReg(LHS2).addReg(RHS2)
5454 .addImm(ARMCC::EQ).addReg(ARM::CPSR);
5455 }
5456
5457 MachineBasicBlock *destMBB = MI->getOperand(RHSisZero ? 3 : 5).getMBB();
5458 MachineBasicBlock *exitMBB = OtherSucc(BB, destMBB);
5459 if (MI->getOperand(0).getImm() == ARMCC::NE)
5460 std::swap(destMBB, exitMBB);
5461
5462 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
5463 .addMBB(destMBB).addImm(ARMCC::EQ).addReg(ARM::CPSR);
5464 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2B : ARM::B))
5465 .addMBB(exitMBB);
5466
5467 MI->eraseFromParent(); // The pseudo instruction is gone now.
5468 return BB;
5469 }
5470 }
5471 }
5472
5473 //===----------------------------------------------------------------------===//
5474 // ARM Optimization Hooks
5475 //===----------------------------------------------------------------------===//
5476
5477 static
5478 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
5479 TargetLowering::DAGCombinerInfo &DCI) {
5480 SelectionDAG &DAG = DCI.DAG;
5481 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5482 EVT VT = N->getValueType(0);
5483 unsigned Opc = N->getOpcode();
5484 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
5485 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
5486 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
5487 ISD::CondCode CC = ISD::SETCC_INVALID;
5488
5489 if (isSlctCC) {
5490 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
5491 } else {
5492 SDValue CCOp = Slct.getOperand(0);
5493 if (CCOp.getOpcode() == ISD::SETCC)
5494 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
5495 }
5496
5497 bool DoXform = false;
5498 bool InvCC = false;
5499 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
5500 "Bad input!");
5501
5502 if (LHS.getOpcode() == ISD::Constant &&
5503 cast<ConstantSDNode>(LHS)->isNullValue()) {
5504 DoXform = true;
5505 } else if (CC != ISD::SETCC_INVALID &&
5506 RHS.getOpcode() == ISD::Constant &&
5507 cast<ConstantSDNode>(RHS)->isNullValue()) {
5508 std::swap(LHS, RHS);
5509 SDValue Op0 = Slct.getOperand(0);
5510 EVT OpVT = isSlctCC ? Op0.getValueType() :
5511 Op0.getOperand(0).getValueType();
5512 bool isInt = OpVT.isInteger();
5513 CC = ISD::getSetCCInverse(CC, isInt);
5514
5515 if (!TLI.isCondCodeLegal(CC, OpVT))
5516 return SDValue(); // Inverse operator isn't legal.
5517
5518 DoXform = true;
5519 InvCC = true;
5520 }
5521
5522 if (DoXform) {
5523 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
5524 if (isSlctCC)
5525 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
5526 Slct.getOperand(0), Slct.getOperand(1), CC);
5527 SDValue CCOp = Slct.getOperand(0);
5528 if (InvCC)
5529 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
5530 CCOp.getOperand(0), CCOp.getOperand(1), CC);
5531 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
5532 CCOp, OtherOp, Result);
5533 }
5534 return SDValue();
5535 }
5536
5537 // AddCombineToVPADDL- For pair-wise add on neon, use the vpaddl instruction
5538 // (only after legalization).
5539 static SDValue AddCombineToVPADDL(SDNode *N, SDValue N0, SDValue N1,
5540 TargetLowering::DAGCombinerInfo &DCI,
5541 const ARMSubtarget *Subtarget) {
5542
5543 // Only perform optimization if after legalize, and if NEON is available. We
5544 // also expected both operands to be BUILD_VECTORs.
5545 if (DCI.isBeforeLegalize() || !Subtarget->hasNEON()
5546 || N0.getOpcode() != ISD::BUILD_VECTOR
5547 || N1.getOpcode() != ISD::BUILD_VECTOR)
5548 return SDValue();
5549
5550 // Check output type since VPADDL operand elements can only be 8, 16, or 32.
5551 EVT VT = N->getValueType(0);
5552 if (!VT.isInteger() || VT.getVectorElementType() == MVT::i64)
5553 return SDValue();
5554
5555 // Check that the vector operands are of the right form.
5556 // N0 and N1 are BUILD_VECTOR nodes with N number of EXTRACT_VECTOR
5557 // operands, where N is the size of the formed vector.
5558 // Each EXTRACT_VECTOR should have the same input vector and odd or even
5559 // index such that we have a pair wise add pattern.
5560
5561 // Grab the vector that all EXTRACT_VECTOR nodes should be referencing.
5562 if (N0->getOperand(0)->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
5563 return SDValue();
5564 SDValue Vec = N0->getOperand(0)->getOperand(0);
5565 SDNode *V = Vec.getNode();
5566 unsigned nextIndex = 0;
5567
5568 // For each operands to the ADD which are BUILD_VECTORs,
5569 // check to see if each of their operands are an EXTRACT_VECTOR with
5570 // the same vector and appropriate index.
5571 for (unsigned i = 0, e = N0->getNumOperands(); i != e; ++i) {
5572 if (N0->getOperand(i)->getOpcode() == ISD::EXTRACT_VECTOR_ELT
5573 && N1->getOperand(i)->getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
5574
5575 SDValue ExtVec0 = N0->getOperand(i);
5576 SDValue ExtVec1 = N1->getOperand(i);
5577
5578 // First operand is the vector, verify its the same.
5579 if (V != ExtVec0->getOperand(0).getNode() ||
5580 V != ExtVec1->getOperand(0).getNode())
5581 return SDValue();
5582
5583 // Second is the constant, verify its correct.
5584 ConstantSDNode *C0 = dyn_cast<ConstantSDNode>(ExtVec0->getOperand(1));
5585 ConstantSDNode *C1 = dyn_cast<ConstantSDNode>(ExtVec1->getOperand(1));
5586
5587 // For the constant, we want to see all the even or all the odd.
5588 if (!C0 || !C1 || C0->getZExtValue() != nextIndex
5589 || C1->getZExtValue() != nextIndex+1)
5590 return SDValue();
5591
5592 // Increment index.
5593 nextIndex+=2;
5594 } else
5595 return SDValue();
5596 }
5597
5598 // Create VPADDL node.
5599 SelectionDAG &DAG = DCI.DAG;
5600 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5601
5602 // Build operand list.
5603 SmallVector<SDValue, 8> Ops;
5604 Ops.push_back(DAG.getConstant(Intrinsic::arm_neon_vpaddls,
5605 TLI.getPointerTy()));
5606
5607 // Input is the vector.
5608 Ops.push_back(Vec);
5609
5610 // Get widened type and narrowed type.
5611 MVT widenType;
5612 unsigned numElem = VT.getVectorNumElements();
5613 switch (VT.getVectorElementType().getSimpleVT().SimpleTy) {
5614 case MVT::i8: widenType = MVT::getVectorVT(MVT::i16, numElem); break;
5615 case MVT::i16: widenType = MVT::getVectorVT(MVT::i32, numElem); break;
5616 case MVT::i32: widenType = MVT::getVectorVT(MVT::i64, numElem); break;
5617 default:
5618 assert(0 && "Invalid vector element type for padd optimization.");
5619 }
5620
5621 SDValue tmp = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, N->getDebugLoc(),
5622 widenType, &Ops[0], Ops.size());
5623 return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, tmp);
5624 }
5625
5626 /// PerformADDCombineWithOperands - Try DAG combinations for an ADD with
5627 /// operands N0 and N1. This is a helper for PerformADDCombine that is
5628 /// called with the default operands, and if that fails, with commuted
5629 /// operands.
5630 static SDValue PerformADDCombineWithOperands(SDNode *N, SDValue N0, SDValue N1,
5631 TargetLowering::DAGCombinerInfo &DCI,
5632 const ARMSubtarget *Subtarget){
5633
5634 // Attempt to create vpaddl for this add.
5635 SDValue Result = AddCombineToVPADDL(N, N0, N1, DCI, Subtarget);
5636 if (Result.getNode())
5637 return Result;
5638
5639 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
5640 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
5641 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
5642 if (Result.getNode()) return Result;
5643 }
5644 return SDValue();
5645 }
5646
5647 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
5648 ///
5649 static SDValue PerformADDCombine(SDNode *N,
5650 TargetLowering::DAGCombinerInfo &DCI,
5651 const ARMSubtarget *Subtarget) {
5652 SDValue N0 = N->getOperand(0);
5653 SDValue N1 = N->getOperand(1);
5654
5655 // First try with the default operand order.
5656 SDValue Result = PerformADDCombineWithOperands(N, N0, N1, DCI, Subtarget);
5657 if (Result.getNode())
5658 return Result;
5659
5660 // If that didn't work, try again with the operands commuted.
5661 return PerformADDCombineWithOperands(N, N1, N0, DCI, Subtarget);
5662 }
5663
5664 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
5665 ///
5666 static SDValue PerformSUBCombine(SDNode *N,
5667 TargetLowering::DAGCombinerInfo &DCI) {
5668 SDValue N0 = N->getOperand(0);
5669 SDValue N1 = N->getOperand(1);
5670
5671 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
5672 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
5673 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
5674 if (Result.getNode()) return Result;
5675 }
5676
5677 return SDValue();
5678 }
5679
5680 /// PerformVMULCombine
5681 /// Distribute (A + B) * C to (A * C) + (B * C) to take advantage of the
5682 /// special multiplier accumulator forwarding.
5683 /// vmul d3, d0, d2
5684 /// vmla d3, d1, d2
5685 /// is faster than
5686 /// vadd d3, d0, d1
5687 /// vmul d3, d3, d2
5688 static SDValue PerformVMULCombine(SDNode *N,
5689 TargetLowering::DAGCombinerInfo &DCI,
5690 const ARMSubtarget *Subtarget) {
5691 if (!Subtarget->hasVMLxForwarding())
5692 return SDValue();
5693
5694 SelectionDAG &DAG = DCI.DAG;
5695 SDValue N0 = N->getOperand(0);
5696 SDValue N1 = N->getOperand(1);
5697 unsigned Opcode = N0.getOpcode();
5698 if (Opcode != ISD::ADD && Opcode != ISD::SUB &&
5699 Opcode != ISD::FADD && Opcode != ISD::FSUB) {
5700 Opcode = N1.getOpcode();
5701 if (Opcode != ISD::ADD && Opcode != ISD::SUB &&
5702 Opcode != ISD::FADD && Opcode != ISD::FSUB)
5703 return SDValue();
5704 std::swap(N0, N1);
5705 }
5706
5707 EVT VT = N->getValueType(0);
5708 DebugLoc DL = N->getDebugLoc();
5709 SDValue N00 = N0->getOperand(0);
5710 SDValue N01 = N0->getOperand(1);
5711 return DAG.getNode(Opcode, DL, VT,
5712 DAG.getNode(ISD::MUL, DL, VT, N00, N1),
5713 DAG.getNode(ISD::MUL, DL, VT, N01, N1));
5714 }
5715
5716 static SDValue PerformMULCombine(SDNode *N,
5717 TargetLowering::DAGCombinerInfo &DCI,
5718 const ARMSubtarget *Subtarget) {
5719 SelectionDAG &DAG = DCI.DAG;
5720
5721 if (Subtarget->isThumb1Only())
5722 return SDValue();
5723
5724 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
5725 return SDValue();
5726
5727 EVT VT = N->getValueType(0);
5728 if (VT.is64BitVector() || VT.is128BitVector())
5729 return PerformVMULCombine(N, DCI, Subtarget);
5730 if (VT != MVT::i32)
5731 return SDValue();
5732
5733 ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
5734 if (!C)
5735 return SDValue();
5736
5737 uint64_t MulAmt = C->getZExtValue();
5738 unsigned ShiftAmt = CountTrailingZeros_64(MulAmt);
5739 ShiftAmt = ShiftAmt & (32 - 1);
5740 SDValue V = N->getOperand(0);
5741 DebugLoc DL = N->getDebugLoc();
5742
5743 SDValue Res;
5744 MulAmt >>= ShiftAmt;
5745 if (isPowerOf2_32(MulAmt - 1)) {
5746 // (mul x, 2^N + 1) => (add (shl x, N), x)
5747 Res = DAG.getNode(ISD::ADD, DL, VT,
5748 V, DAG.getNode(ISD::SHL, DL, VT,
5749 V, DAG.getConstant(Log2_32(MulAmt-1),
5750 MVT::i32)));
5751 } else if (isPowerOf2_32(MulAmt + 1)) {
5752 // (mul x, 2^N - 1) => (sub (shl x, N), x)
5753 Res = DAG.getNode(ISD::SUB, DL, VT,
5754 DAG.getNode(ISD::SHL, DL, VT,
5755 V, DAG.getConstant(Log2_32(MulAmt+1),
5756 MVT::i32)),
5757 V);
5758 } else
5759 return SDValue();
5760
5761 if (ShiftAmt != 0)
5762 Res = DAG.getNode(ISD::SHL, DL, VT, Res,
5763 DAG.getConstant(ShiftAmt, MVT::i32));
5764
5765 // Do not add new nodes to DAG combiner worklist.
5766 DCI.CombineTo(N, Res, false);
5767 return SDValue();
5768 }
5769
5770 static SDValue PerformANDCombine(SDNode *N,
5771 TargetLowering::DAGCombinerInfo &DCI) {
5772
5773 // Attempt to use immediate-form VBIC
5774 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N->getOperand(1));
5775 DebugLoc dl = N->getDebugLoc();
5776 EVT VT = N->getValueType(0);
5777 SelectionDAG &DAG = DCI.DAG;
5778
5779 if(!DAG.getTargetLoweringInfo().isTypeLegal(VT))
5780 return SDValue();
5781
5782 APInt SplatBits, SplatUndef;
5783 unsigned SplatBitSize;
5784 bool HasAnyUndefs;
5785 if (BVN &&
5786 BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
5787 if (SplatBitSize <= 64) {
5788 EVT VbicVT;
5789 SDValue Val = isNEONModifiedImm((~SplatBits).getZExtValue(),
5790 SplatUndef.getZExtValue(), SplatBitSize,
5791 DAG, VbicVT, VT.is128BitVector(),
5792 OtherModImm);
5793 if (Val.getNode()) {
5794 SDValue Input =
5795 DAG.getNode(ISD::BITCAST, dl, VbicVT, N->getOperand(0));
5796 SDValue Vbic = DAG.getNode(ARMISD::VBICIMM, dl, VbicVT, Input, Val);
5797 return DAG.getNode(ISD::BITCAST, dl, VT, Vbic);
5798 }
5799 }
5800 }
5801
5802 return SDValue();
5803 }
5804
5805 /// PerformORCombine - Target-specific dag combine xforms for ISD::OR
5806 static SDValue PerformORCombine(SDNode *N,
5807 TargetLowering::DAGCombinerInfo &DCI,
5808 const ARMSubtarget *Subtarget) {
5809 // Attempt to use immediate-form VORR
5810 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N->getOperand(1));
5811 DebugLoc dl = N->getDebugLoc();
5812 EVT VT = N->getValueType(0);
5813 SelectionDAG &DAG = DCI.DAG;
5814
5815 if(!DAG.getTargetLoweringInfo().isTypeLegal(VT))
5816 return SDValue();
5817
5818 APInt SplatBits, SplatUndef;
5819 unsigned SplatBitSize;
5820 bool HasAnyUndefs;
5821 if (BVN && Subtarget->hasNEON() &&
5822 BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
5823 if (SplatBitSize <= 64) {
5824 EVT VorrVT;
5825 SDValue Val = isNEONModifiedImm(SplatBits.getZExtValue(),
5826 SplatUndef.getZExtValue(), SplatBitSize,
5827 DAG, VorrVT, VT.is128BitVector(),
5828 OtherModImm);
5829 if (Val.getNode()) {
5830 SDValue Input =
5831 DAG.getNode(ISD::BITCAST, dl, VorrVT, N->getOperand(0));
5832 SDValue Vorr = DAG.getNode(ARMISD::VORRIMM, dl, VorrVT, Input, Val);
5833 return DAG.getNode(ISD::BITCAST, dl, VT, Vorr);
5834 }
5835 }
5836 }
5837
5838 SDValue N0 = N->getOperand(0);
5839 if (N0.getOpcode() != ISD::AND)
5840 return SDValue();
5841 SDValue N1 = N->getOperand(1);
5842
5843 // (or (and B, A), (and C, ~A)) => (VBSL A, B, C) when A is a constant.
5844 if (Subtarget->hasNEON() && N1.getOpcode() == ISD::AND && VT.isVector() &&
5845 DAG.getTargetLoweringInfo().isTypeLegal(VT)) {
5846 APInt SplatUndef;
5847 unsigned SplatBitSize;
5848 bool HasAnyUndefs;
5849
5850 BuildVectorSDNode *BVN0 = dyn_cast<BuildVectorSDNode>(N0->getOperand(1));
5851 APInt SplatBits0;
5852 if (BVN0 && BVN0->isConstantSplat(SplatBits0, SplatUndef, SplatBitSize,
5853 HasAnyUndefs) && !HasAnyUndefs) {
5854 BuildVectorSDNode *BVN1 = dyn_cast<BuildVectorSDNode>(N1->getOperand(1));
5855 APInt SplatBits1;
5856 if (BVN1 && BVN1->isConstantSplat(SplatBits1, SplatUndef, SplatBitSize,
5857 HasAnyUndefs) && !HasAnyUndefs &&
5858 SplatBits0 == ~SplatBits1) {
5859 // Canonicalize the vector type to make instruction selection simpler.
5860 EVT CanonicalVT = VT.is128BitVector() ? MVT::v4i32 : MVT::v2i32;
5861 SDValue Result = DAG.getNode(ARMISD::VBSL, dl, CanonicalVT,
5862 N0->getOperand(1), N0->getOperand(0),
5863 N1->getOperand(0));
5864 return DAG.getNode(ISD::BITCAST, dl, VT, Result);
5865 }
5866 }
5867 }
5868
5869 // Try to use the ARM/Thumb2 BFI (bitfield insert) instruction when
5870 // reasonable.
5871
5872 // BFI is only available on V6T2+
5873 if (Subtarget->isThumb1Only() || !Subtarget->hasV6T2Ops())
5874 return SDValue();
5875
5876 DebugLoc DL = N->getDebugLoc();
5877 // 1) or (and A, mask), val => ARMbfi A, val, mask
5878 // iff (val & mask) == val
5879 //
5880 // 2) or (and A, mask), (and B, mask2) => ARMbfi A, (lsr B, amt), mask
5881 // 2a) iff isBitFieldInvertedMask(mask) && isBitFieldInvertedMask(~mask2)
5882 // && mask == ~mask2
5883 // 2b) iff isBitFieldInvertedMask(~mask) && isBitFieldInvertedMask(mask2)
5884 // && ~mask == mask2
5885 // (i.e., copy a bitfield value into another bitfield of the same width)
5886
5887 if (VT != MVT::i32)
5888 return SDValue();
5889
5890 SDValue N00 = N0.getOperand(0);
5891
5892 // The value and the mask need to be constants so we can verify this is
5893 // actually a bitfield set. If the mask is 0xffff, we can do better
5894 // via a movt instruction, so don't use BFI in that case.
5895 SDValue MaskOp = N0.getOperand(1);
5896 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(MaskOp);
5897 if (!MaskC)
5898 return SDValue();
5899 unsigned Mask = MaskC->getZExtValue();
5900 if (Mask == 0xffff)
5901 return SDValue();
5902 SDValue Res;
5903 // Case (1): or (and A, mask), val => ARMbfi A, val, mask
5904 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
5905 if (N1C) {
5906 unsigned Val = N1C->getZExtValue();
5907 if ((Val & ~Mask) != Val)
5908 return SDValue();
5909
5910 if (ARM::isBitFieldInvertedMask(Mask)) {
5911 Val >>= CountTrailingZeros_32(~Mask);
5912
5913 Res = DAG.getNode(ARMISD::BFI, DL, VT, N00,
5914 DAG.getConstant(Val, MVT::i32),
5915 DAG.getConstant(Mask, MVT::i32));
5916
5917 // Do not add new nodes to DAG combiner worklist.
5918 DCI.CombineTo(N, Res, false);
5919 return SDValue();
5920 }
5921 } else if (N1.getOpcode() == ISD::AND) {
5922 // case (2) or (and A, mask), (and B, mask2) => ARMbfi A, (lsr B, amt), mask
5923 ConstantSDNode *N11C = dyn_cast<ConstantSDNode>(N1.getOperand(1));
5924 if (!N11C)
5925 return SDValue();
5926 unsigned Mask2 = N11C->getZExtValue();
5927
5928 // Mask and ~Mask2 (or reverse) must be equivalent for the BFI pattern
5929 // as is to match.
5930 if (ARM::isBitFieldInvertedMask(Mask) &&
5931 (Mask == ~Mask2)) {
5932 // The pack halfword instruction works better for masks that fit it,
5933 // so use that when it's available.
5934 if (Subtarget->hasT2ExtractPack() &&
5935 (Mask == 0xffff || Mask == 0xffff0000))
5936 return SDValue();
5937 // 2a
5938 unsigned amt = CountTrailingZeros_32(Mask2);
5939 Res = DAG.getNode(ISD::SRL, DL, VT, N1.getOperand(0),
5940 DAG.getConstant(amt, MVT::i32));
5941 Res = DAG.getNode(ARMISD::BFI, DL, VT, N00, Res,
5942 DAG.getConstant(Mask, MVT::i32));
5943 // Do not add new nodes to DAG combiner worklist.
5944 DCI.CombineTo(N, Res, false);
5945 return SDValue();
5946 } else if (ARM::isBitFieldInvertedMask(~Mask) &&
5947 (~Mask == Mask2)) {
5948 // The pack halfword instruction works better for masks that fit it,
5949 // so use that when it's available.
5950 if (Subtarget->hasT2ExtractPack() &&
5951 (Mask2 == 0xffff || Mask2 == 0xffff0000))
5952 return SDValue();
5953 // 2b
5954 unsigned lsb = CountTrailingZeros_32(Mask);
5955 Res = DAG.getNode(ISD::SRL, DL, VT, N00,
5956 DAG.getConstant(lsb, MVT::i32));
5957 Res = DAG.getNode(ARMISD::BFI, DL, VT, N1.getOperand(0), Res,
5958 DAG.getConstant(Mask2, MVT::i32));
5959 // Do not add new nodes to DAG combiner worklist.
5960 DCI.CombineTo(N, Res, false);
5961 return SDValue();
5962 }
5963 }
5964
5965 if (DAG.MaskedValueIsZero(N1, MaskC->getAPIntValue()) &&
5966 N00.getOpcode() == ISD::SHL && isa<ConstantSDNode>(N00.getOperand(1)) &&
5967 ARM::isBitFieldInvertedMask(~Mask)) {
5968 // Case (3): or (and (shl A, #shamt), mask), B => ARMbfi B, A, ~mask
5969 // where lsb(mask) == #shamt and masked bits of B are known zero.
5970 SDValue ShAmt = N00.getOperand(1);
5971 unsigned ShAmtC = cast<ConstantSDNode>(ShAmt)->getZExtValue();
5972 unsigned LSB = CountTrailingZeros_32(Mask);
5973 if (ShAmtC != LSB)
5974 return SDValue();
5975
5976 Res = DAG.getNode(ARMISD::BFI, DL, VT, N1, N00.getOperand(0),
5977 DAG.getConstant(~Mask, MVT::i32));
5978
5979 // Do not add new nodes to DAG combiner worklist.
5980 DCI.CombineTo(N, Res, false);
5981 }
5982
5983 return SDValue();
5984 }
5985
5986 /// PerformBFICombine - (bfi A, (and B, Mask1), Mask2) -> (bfi A, B, Mask2) iff
5987 /// the bits being cleared by the AND are not demanded by the BFI.
5988 static SDValue PerformBFICombine(SDNode *N,
5989 TargetLowering::DAGCombinerInfo &DCI) {
5990 SDValue N1 = N->getOperand(1);
5991 if (N1.getOpcode() == ISD::AND) {
5992 ConstantSDNode *N11C = dyn_cast<ConstantSDNode>(N1.getOperand(1));
5993 if (!N11C)
5994 return SDValue();
5995 unsigned InvMask = cast<ConstantSDNode>(N->getOperand(2))->getZExtValue();
5996 unsigned LSB = CountTrailingZeros_32(~InvMask);
5997 unsigned Width = (32 - CountLeadingZeros_32(~InvMask)) - LSB;
5998 unsigned Mask = (1 << Width)-1;
5999 unsigned Mask2 = N11C->getZExtValue();
6000 if ((Mask & (~Mask2)) == 0)
6001 return DCI.DAG.getNode(ARMISD::BFI, N->getDebugLoc(), N->getValueType(0),
6002 N->getOperand(0), N1.getOperand(0),
6003 N->getOperand(2));
6004 }
6005 return SDValue();
6006 }
6007
6008 /// PerformVMOVRRDCombine - Target-specific dag combine xforms for
6009 /// ARMISD::VMOVRRD.
6010 static SDValue PerformVMOVRRDCombine(SDNode *N,
6011 TargetLowering::DAGCombinerInfo &DCI) {
6012 // vmovrrd(vmovdrr x, y) -> x,y
6013 SDValue InDouble = N->getOperand(0);
6014 if (InDouble.getOpcode() == ARMISD::VMOVDRR)
6015 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
6016
6017 // vmovrrd(load f64) -> (load i32), (load i32)
6018 SDNode *InNode = InDouble.getNode();
6019 if (ISD::isNormalLoad(InNode) && InNode->hasOneUse() &&
6020 InNode->getValueType(0) == MVT::f64 &&
6021 InNode->getOperand(1).getOpcode() == ISD::FrameIndex &&
6022 !cast<LoadSDNode>(InNode)->isVolatile()) {
6023 // TODO: Should this be done for non-FrameIndex operands?
6024 LoadSDNode *LD = cast<LoadSDNode>(InNode);
6025
6026 SelectionDAG &DAG = DCI.DAG;
6027 DebugLoc DL = LD->getDebugLoc();
6028 SDValue BasePtr = LD->getBasePtr();
6029 SDValue NewLD1 = DAG.getLoad(MVT::i32, DL, LD->getChain(), BasePtr,
6030 LD->getPointerInfo(), LD->isVolatile(),
6031 LD->isNonTemporal(), LD->getAlignment());
6032
6033 SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr,
6034 DAG.getConstant(4, MVT::i32));
6035 SDValue NewLD2 = DAG.getLoad(MVT::i32, DL, NewLD1.getValue(1), OffsetPtr,
6036 LD->getPointerInfo(), LD->isVolatile(),
6037 LD->isNonTemporal(),
6038 std::min(4U, LD->getAlignment() / 2));
6039
6040 DAG.ReplaceAllUsesOfValueWith(SDValue(LD, 1), NewLD2.getValue(1));
6041 SDValue Result = DCI.CombineTo(N, NewLD1, NewLD2);
6042 DCI.RemoveFromWorklist(LD);
6043 DAG.DeleteNode(LD);
6044 return Result;
6045 }
6046
6047 return SDValue();
6048 }
6049
6050 /// PerformVMOVDRRCombine - Target-specific dag combine xforms for
6051 /// ARMISD::VMOVDRR. This is also used for BUILD_VECTORs with 2 operands.
6052 static SDValue PerformVMOVDRRCombine(SDNode *N, SelectionDAG &DAG) {
6053 // N=vmovrrd(X); vmovdrr(N:0, N:1) -> bit_convert(X)
6054 SDValue Op0 = N->getOperand(0);
6055 SDValue Op1 = N->getOperand(1);
6056 if (Op0.getOpcode() == ISD::BITCAST)
6057 Op0 = Op0.getOperand(0);
6058 if (Op1.getOpcode() == ISD::BITCAST)
6059 Op1 = Op1.getOperand(0);
6060 if (Op0.getOpcode() == ARMISD::VMOVRRD &&
6061 Op0.getNode() == Op1.getNode() &&
6062 Op0.getResNo() == 0 && Op1.getResNo() == 1)
6063 return DAG.getNode(ISD::BITCAST, N->getDebugLoc(),
6064 N->getValueType(0), Op0.getOperand(0));
6065 return SDValue();
6066 }
6067
6068 /// PerformSTORECombine - Target-specific dag combine xforms for
6069 /// ISD::STORE.
6070 static SDValue PerformSTORECombine(SDNode *N,
6071 TargetLowering::DAGCombinerInfo &DCI) {
6072 // Bitcast an i64 store extracted from a vector to f64.
6073 // Otherwise, the i64 value will be legalized to a pair of i32 values.
6074 StoreSDNode *St = cast<StoreSDNode>(N);
6075 SDValue StVal = St->getValue();
6076 if (!ISD::isNormalStore(St) || St->isVolatile())
6077 return SDValue();
6078
6079 if (StVal.getNode()->getOpcode() == ARMISD::VMOVDRR &&
6080 StVal.getNode()->hasOneUse() && !St->isVolatile()) {
6081 SelectionDAG &DAG = DCI.DAG;
6082 DebugLoc DL = St->getDebugLoc();
6083 SDValue BasePtr = St->getBasePtr();
6084 SDValue NewST1 = DAG.getStore(St->getChain(), DL,
6085 StVal.getNode()->getOperand(0), BasePtr,
6086 St->getPointerInfo(), St->isVolatile(),
6087 St->isNonTemporal(), St->getAlignment());
6088
6089 SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr,
6090 DAG.getConstant(4, MVT::i32));
6091 return DAG.getStore(NewST1.getValue(0), DL, StVal.getNode()->getOperand(1),
6092 OffsetPtr, St->getPointerInfo(), St->isVolatile(),
6093 St->isNonTemporal(),
6094 std::min(4U, St->getAlignment() / 2));
6095 }
6096
6097 if (StVal.getValueType() != MVT::i64 ||
6098 StVal.getNode()->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
6099 return SDValue();
6100
6101 SelectionDAG &DAG = DCI.DAG;
6102 DebugLoc dl = StVal.getDebugLoc();
6103 SDValue IntVec = StVal.getOperand(0);
6104 EVT FloatVT = EVT::getVectorVT(*DAG.getContext(), MVT::f64,
6105 IntVec.getValueType().getVectorNumElements());
6106 SDValue Vec = DAG.getNode(ISD::BITCAST, dl, FloatVT, IntVec);
6107 SDValue ExtElt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
6108 Vec, StVal.getOperand(1));
6109 dl = N->getDebugLoc();
6110 SDValue V = DAG.getNode(ISD::BITCAST, dl, MVT::i64, ExtElt);
6111 // Make the DAGCombiner fold the bitcasts.
6112 DCI.AddToWorklist(Vec.getNode());
6113 DCI.AddToWorklist(ExtElt.getNode());
6114 DCI.AddToWorklist(V.getNode());
6115 return DAG.getStore(St->getChain(), dl, V, St->getBasePtr(),
6116 St->getPointerInfo(), St->isVolatile(),
6117 St->isNonTemporal(), St->getAlignment(),
6118 St->getTBAAInfo());
6119 }
6120
6121 /// hasNormalLoadOperand - Check if any of the operands of a BUILD_VECTOR node
6122 /// are normal, non-volatile loads. If so, it is profitable to bitcast an
6123 /// i64 vector to have f64 elements, since the value can then be loaded
6124 /// directly into a VFP register.
6125 static bool hasNormalLoadOperand(SDNode *N) {
6126 unsigned NumElts = N->getValueType(0).getVectorNumElements();
6127 for (unsigned i = 0; i < NumElts; ++i) {
6128 SDNode *Elt = N->getOperand(i).getNode();
6129 if (ISD::isNormalLoad(Elt) && !cast<LoadSDNode>(Elt)->isVolatile())
6130 return true;
6131 }
6132 return false;
6133 }
6134
6135 /// PerformBUILD_VECTORCombine - Target-specific dag combine xforms for
6136 /// ISD::BUILD_VECTOR.
6137 static SDValue PerformBUILD_VECTORCombine(SDNode *N,
6138 TargetLowering::DAGCombinerInfo &DCI){
6139 // build_vector(N=ARMISD::VMOVRRD(X), N:1) -> bit_convert(X):
6140 // VMOVRRD is introduced when legalizing i64 types. It forces the i64 value
6141 // into a pair of GPRs, which is fine when the value is used as a scalar,
6142 // but if the i64 value is converted to a vector, we need to undo the VMOVRRD.
6143 SelectionDAG &DAG = DCI.DAG;
6144 if (N->getNumOperands() == 2) {
6145 SDValue RV = PerformVMOVDRRCombine(N, DAG);
6146 if (RV.getNode())
6147 return RV;
6148 }
6149
6150 // Load i64 elements as f64 values so that type legalization does not split
6151 // them up into i32 values.
6152 EVT VT = N->getValueType(0);
6153 if (VT.getVectorElementType() != MVT::i64 || !hasNormalLoadOperand(N))
6154 return SDValue();
6155 DebugLoc dl = N->getDebugLoc();
6156 SmallVector<SDValue, 8> Ops;
6157 unsigned NumElts = VT.getVectorNumElements();
6158 for (unsigned i = 0; i < NumElts; ++i) {
6159 SDValue V = DAG.getNode(ISD::BITCAST, dl, MVT::f64, N->getOperand(i));
6160 Ops.push_back(V);
6161 // Make the DAGCombiner fold the bitcast.
6162 DCI.AddToWorklist(V.getNode());
6163 }
6164 EVT FloatVT = EVT::getVectorVT(*DAG.getContext(), MVT::f64, NumElts);
6165 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, FloatVT, Ops.data(), NumElts);
6166 return DAG.getNode(ISD::BITCAST, dl, VT, BV);
6167 }
6168
6169 /// PerformInsertEltCombine - Target-specific dag combine xforms for
6170 /// ISD::INSERT_VECTOR_ELT.
6171 static SDValue PerformInsertEltCombine(SDNode *N,
6172 TargetLowering::DAGCombinerInfo &DCI) {
6173 // Bitcast an i64 load inserted into a vector to f64.
6174 // Otherwise, the i64 value will be legalized to a pair of i32 values.
6175 EVT VT = N->getValueType(0);
6176 SDNode *Elt = N->getOperand(1).getNode();
6177 if (VT.getVectorElementType() != MVT::i64 ||
6178 !ISD::isNormalLoad(Elt) || cast<LoadSDNode>(Elt)->isVolatile())
6179 return SDValue();
6180
6181 SelectionDAG &DAG = DCI.DAG;
6182 DebugLoc dl = N->getDebugLoc();
6183 EVT FloatVT = EVT::getVectorVT(*DAG.getContext(), MVT::f64,
6184 VT.getVectorNumElements());
6185 SDValue Vec = DAG.getNode(ISD::BITCAST, dl, FloatVT, N->getOperand(0));
6186 SDValue V = DAG.getNode(ISD::BITCAST, dl, MVT::f64, N->getOperand(1));
6187 // Make the DAGCombiner fold the bitcasts.
6188 DCI.AddToWorklist(Vec.getNode());
6189 DCI.AddToWorklist(V.getNode());
6190 SDValue InsElt = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, FloatVT,
6191 Vec, V, N->getOperand(2));
6192 return DAG.getNode(ISD::BITCAST, dl, VT, InsElt);
6193 }
6194
6195 /// PerformVECTOR_SHUFFLECombine - Target-specific dag combine xforms for
6196 /// ISD::VECTOR_SHUFFLE.
6197 static SDValue PerformVECTOR_SHUFFLECombine(SDNode *N, SelectionDAG &DAG) {
6198 // The LLVM shufflevector instruction does not require the shuffle mask
6199 // length to match the operand vector length, but ISD::VECTOR_SHUFFLE does
6200 // have that requirement. When translating to ISD::VECTOR_SHUFFLE, if the
6201 // operands do not match the mask length, they are extended by concatenating
6202 // them with undef vectors. That is probably the right thing for other
6203 // targets, but for NEON it is better to concatenate two double-register
6204 // size vector operands into a single quad-register size vector. Do that
6205 // transformation here:
6206 // shuffle(concat(v1, undef), concat(v2, undef)) ->
6207 // shuffle(concat(v1, v2), undef)
6208 SDValue Op0 = N->getOperand(0);
6209 SDValue Op1 = N->getOperand(1);
6210 if (Op0.getOpcode() != ISD::CONCAT_VECTORS ||
6211 Op1.getOpcode() != ISD::CONCAT_VECTORS ||
6212 Op0.getNumOperands() != 2 ||
6213 Op1.getNumOperands() != 2)
6214 return SDValue();
6215 SDValue Concat0Op1 = Op0.getOperand(1);
6216 SDValue Concat1Op1 = Op1.getOperand(1);
6217 if (Concat0Op1.getOpcode() != ISD::UNDEF ||
6218 Concat1Op1.getOpcode() != ISD::UNDEF)
6219 return SDValue();
6220 // Skip the transformation if any of the types are illegal.
6221 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
6222 EVT VT = N->getValueType(0);
6223 if (!TLI.isTypeLegal(VT) ||
6224 !TLI.isTypeLegal(Concat0Op1.getValueType()) ||
6225 !TLI.isTypeLegal(Concat1Op1.getValueType()))
6226 return SDValue();
6227
6228 SDValue NewConcat = DAG.getNode(ISD::CONCAT_VECTORS, N->getDebugLoc(), VT,
6229 Op0.getOperand(0), Op1.getOperand(0));
6230 // Translate the shuffle mask.
6231 SmallVector<int, 16> NewMask;
6232 unsigned NumElts = VT.getVectorNumElements();
6233 unsigned HalfElts = NumElts/2;
6234 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
6235 for (unsigned n = 0; n < NumElts; ++n) {
6236 int MaskElt = SVN->getMaskElt(n);
6237 int NewElt = -1;
6238 if (MaskElt < (int)HalfElts)
6239 NewElt = MaskElt;
6240 else if (MaskElt >= (int)NumElts && MaskElt < (int)(NumElts + HalfElts))
6241 NewElt = HalfElts + MaskElt - NumElts;
6242 NewMask.push_back(NewElt);
6243 }
6244 return DAG.getVectorShuffle(VT, N->getDebugLoc(), NewConcat,
6245 DAG.getUNDEF(VT), NewMask.data());
6246 }
6247
6248 /// CombineBaseUpdate - Target-specific DAG combine function for VLDDUP and
6249 /// NEON load/store intrinsics to merge base address updates.
6250 static SDValue CombineBaseUpdate(SDNode *N,
6251 TargetLowering::DAGCombinerInfo &DCI) {
6252 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
6253 return SDValue();
6254
6255 SelectionDAG &DAG = DCI.DAG;
6256 bool isIntrinsic = (N->getOpcode() == ISD::INTRINSIC_VOID ||
6257 N->getOpcode() == ISD::INTRINSIC_W_CHAIN);
6258 unsigned AddrOpIdx = (isIntrinsic ? 2 : 1);
6259 SDValue Addr = N->getOperand(AddrOpIdx);
6260
6261 // Search for a use of the address operand that is an increment.
6262 for (SDNode::use_iterator UI = Addr.getNode()->use_begin(),
6263 UE = Addr.getNode()->use_end(); UI != UE; ++UI) {
6264 SDNode *User = *UI;
6265 if (User->getOpcode() != ISD::ADD ||
6266 UI.getUse().getResNo() != Addr.getResNo())
6267 continue;
6268
6269 // Check that the add is independent of the load/store. Otherwise, folding
6270 // it would create a cycle.
6271 if (User->isPredecessorOf(N) || N->isPredecessorOf(User))
6272 continue;
6273
6274 // Find the new opcode for the updating load/store.
6275 bool isLoad = true;
6276 bool isLaneOp = false;
6277 unsigned NewOpc = 0;
6278 unsigned NumVecs = 0;
6279 if (isIntrinsic) {
6280 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
6281 switch (IntNo) {
6282 default: assert(0 && "unexpected intrinsic for Neon base update");
6283 case Intrinsic::arm_neon_vld1: NewOpc = ARMISD::VLD1_UPD;
6284 NumVecs = 1; break;
6285 case Intrinsic::arm_neon_vld2: NewOpc = ARMISD::VLD2_UPD;
6286 NumVecs = 2; break;
6287 case Intrinsic::arm_neon_vld3: NewOpc = ARMISD::VLD3_UPD;
6288 NumVecs = 3; break;
6289 case Intrinsic::arm_neon_vld4: NewOpc = ARMISD::VLD4_UPD;
6290 NumVecs = 4; break;
6291 case Intrinsic::arm_neon_vld2lane: NewOpc = ARMISD::VLD2LN_UPD;
6292 NumVecs = 2; isLaneOp = true; break;
6293 case Intrinsic::arm_neon_vld3lane: NewOpc = ARMISD::VLD3LN_UPD;
6294 NumVecs = 3; isLaneOp = true; break;
6295 case Intrinsic::arm_neon_vld4lane: NewOpc = ARMISD::VLD4LN_UPD;
6296 NumVecs = 4; isLaneOp = true; break;
6297 case Intrinsic::arm_neon_vst1: NewOpc = ARMISD::VST1_UPD;
6298 NumVecs = 1; isLoad = false; break;
6299 case Intrinsic::arm_neon_vst2: NewOpc = ARMISD::VST2_UPD;
6300 NumVecs = 2; isLoad = false; break;
6301 case Intrinsic::arm_neon_vst3: NewOpc = ARMISD::VST3_UPD;
6302 NumVecs = 3; isLoad = false; break;
6303 case Intrinsic::arm_neon_vst4: NewOpc = ARMISD::VST4_UPD;
6304 NumVecs = 4; isLoad = false; break;
6305 case Intrinsic::arm_neon_vst2lane: NewOpc = ARMISD::VST2LN_UPD;
6306 NumVecs = 2; isLoad = false; isLaneOp = true; break;
6307 case Intrinsic::arm_neon_vst3lane: NewOpc = ARMISD::VST3LN_UPD;
6308 NumVecs = 3; isLoad = false; isLaneOp = true; break;
6309 case Intrinsic::arm_neon_vst4lane: NewOpc = ARMISD::VST4LN_UPD;
6310 NumVecs = 4; isLoad = false; isLaneOp = true; break;
6311 }
6312 } else {
6313 isLaneOp = true;
6314 switch (N->getOpcode()) {
6315 default: assert(0 && "unexpected opcode for Neon base update");
6316 case ARMISD::VLD2DUP: NewOpc = ARMISD::VLD2DUP_UPD; NumVecs = 2; break;
6317 case ARMISD::VLD3DUP: NewOpc = ARMISD::VLD3DUP_UPD; NumVecs = 3; break;
6318 case ARMISD::VLD4DUP: NewOpc = ARMISD::VLD4DUP_UPD; NumVecs = 4; break;
6319 }
6320 }
6321
6322 // Find the size of memory referenced by the load/store.
6323 EVT VecTy;
6324 if (isLoad)
6325 VecTy = N->getValueType(0);
6326 else
6327 VecTy = N->getOperand(AddrOpIdx+1).getValueType();
6328 unsigned NumBytes = NumVecs * VecTy.getSizeInBits() / 8;
6329 if (isLaneOp)
6330 NumBytes /= VecTy.getVectorNumElements();
6331
6332 // If the increment is a constant, it must match the memory ref size.
6333 SDValue Inc = User->getOperand(User->getOperand(0) == Addr ? 1 : 0);
6334 if (ConstantSDNode *CInc = dyn_cast<ConstantSDNode>(Inc.getNode())) {
6335 uint64_t IncVal = CInc->getZExtValue();
6336 if (IncVal != NumBytes)
6337 continue;
6338 } else if (NumBytes >= 3 * 16) {
6339 // VLD3/4 and VST3/4 for 128-bit vectors are implemented with two
6340 // separate instructions that make it harder to use a non-constant update.
6341 continue;
6342 }
6343
6344 // Create the new updating load/store node.
6345 EVT Tys[6];
6346 unsigned NumResultVecs = (isLoad ? NumVecs : 0);
6347 unsigned n;
6348 for (n = 0; n < NumResultVecs; ++n)
6349 Tys[n] = VecTy;
6350 Tys[n++] = MVT::i32;
6351 Tys[n] = MVT::Other;
6352 SDVTList SDTys = DAG.getVTList(Tys, NumResultVecs+2);
6353 SmallVector<SDValue, 8> Ops;
6354 Ops.push_back(N->getOperand(0)); // incoming chain
6355 Ops.push_back(N->getOperand(AddrOpIdx));
6356 Ops.push_back(Inc);
6357 for (unsigned i = AddrOpIdx + 1; i < N->getNumOperands(); ++i) {
6358 Ops.push_back(N->getOperand(i));
6359 }
6360 MemIntrinsicSDNode *MemInt = cast<MemIntrinsicSDNode>(N);
6361 SDValue UpdN = DAG.getMemIntrinsicNode(NewOpc, N->getDebugLoc(), SDTys,
6362 Ops.data(), Ops.size(),
6363 MemInt->getMemoryVT(),
6364 MemInt->getMemOperand());
6365
6366 // Update the uses.
6367 std::vector<SDValue> NewResults;
6368 for (unsigned i = 0; i < NumResultVecs; ++i) {
6369 NewResults.push_back(SDValue(UpdN.getNode(), i));
6370 }
6371 NewResults.push_back(SDValue(UpdN.getNode(), NumResultVecs+1)); // chain
6372 DCI.CombineTo(N, NewResults);
6373 DCI.CombineTo(User, SDValue(UpdN.getNode(), NumResultVecs));
6374
6375 break;
6376 }
6377 return SDValue();
6378 }
6379
6380 /// CombineVLDDUP - For a VDUPLANE node N, check if its source operand is a
6381 /// vldN-lane (N > 1) intrinsic, and if all the other uses of that intrinsic
6382 /// are also VDUPLANEs. If so, combine them to a vldN-dup operation and
6383 /// return true.
6384 static bool CombineVLDDUP(SDNode *N, TargetLowering::DAGCombinerInfo &DCI) {
6385 SelectionDAG &DAG = DCI.DAG;
6386 EVT VT = N->getValueType(0);
6387 // vldN-dup instructions only support 64-bit vectors for N > 1.
6388 if (!VT.is64BitVector())
6389 return false;
6390
6391 // Check if the VDUPLANE operand is a vldN-dup intrinsic.
6392 SDNode *VLD = N->getOperand(0).getNode();
6393 if (VLD->getOpcode() != ISD::INTRINSIC_W_CHAIN)
6394 return false;
6395 unsigned NumVecs = 0;
6396 unsigned NewOpc = 0;
6397 unsigned IntNo = cast<ConstantSDNode>(VLD->getOperand(1))->getZExtValue();
6398 if (IntNo == Intrinsic::arm_neon_vld2lane) {
6399 NumVecs = 2;
6400 NewOpc = ARMISD::VLD2DUP;
6401 } else if (IntNo == Intrinsic::arm_neon_vld3lane) {
6402 NumVecs = 3;
6403 NewOpc = ARMISD::VLD3DUP;
6404 } else if (IntNo == Intrinsic::arm_neon_vld4lane) {
6405 NumVecs = 4;
6406 NewOpc = ARMISD::VLD4DUP;
6407 } else {
6408 return false;
6409 }
6410
6411 // First check that all the vldN-lane uses are VDUPLANEs and that the lane
6412 // numbers match the load.
6413 unsigned VLDLaneNo =
6414 cast<ConstantSDNode>(VLD->getOperand(NumVecs+3))->getZExtValue();
6415 for (SDNode::use_iterator UI = VLD->use_begin(), UE = VLD->use_end();
6416 UI != UE; ++UI) {
6417 // Ignore uses of the chain result.
6418 if (UI.getUse().getResNo() == NumVecs)
6419 continue;
6420 SDNode *User = *UI;
6421 if (User->getOpcode() != ARMISD::VDUPLANE ||
6422 VLDLaneNo != cast<ConstantSDNode>(User->getOperand(1))->getZExtValue())
6423 return false;
6424 }
6425
6426 // Create the vldN-dup node.
6427 EVT Tys[5];
6428 unsigned n;
6429 for (n = 0; n < NumVecs; ++n)
6430 Tys[n] = VT;
6431 Tys[n] = MVT::Other;
6432 SDVTList SDTys = DAG.getVTList(Tys, NumVecs+1);
6433 SDValue Ops[] = { VLD->getOperand(0), VLD->getOperand(2) };
6434 MemIntrinsicSDNode *VLDMemInt = cast<MemIntrinsicSDNode>(VLD);
6435 SDValue VLDDup = DAG.getMemIntrinsicNode(NewOpc, VLD->getDebugLoc(), SDTys,
6436 Ops, 2, VLDMemInt->getMemoryVT(),
6437 VLDMemInt->getMemOperand());
6438
6439 // Update the uses.
6440 for (SDNode::use_iterator UI = VLD->use_begin(), UE = VLD->use_end();
6441 UI != UE; ++UI) {
6442 unsigned ResNo = UI.getUse().getResNo();
6443 // Ignore uses of the chain result.
6444 if (ResNo == NumVecs)
6445 continue;
6446 SDNode *User = *UI;
6447 DCI.CombineTo(User, SDValue(VLDDup.getNode(), ResNo));
6448 }
6449
6450 // Now the vldN-lane intrinsic is dead except for its chain result.
6451 // Update uses of the chain.
6452 std::vector<SDValue> VLDDupResults;
6453 for (unsigned n = 0; n < NumVecs; ++n)
6454 VLDDupResults.push_back(SDValue(VLDDup.getNode(), n));
6455 VLDDupResults.push_back(SDValue(VLDDup.getNode(), NumVecs));
6456 DCI.CombineTo(VLD, VLDDupResults);
6457
6458 return true;
6459 }
6460
6461 /// PerformVDUPLANECombine - Target-specific dag combine xforms for
6462 /// ARMISD::VDUPLANE.
6463 static SDValue PerformVDUPLANECombine(SDNode *N,
6464 TargetLowering::DAGCombinerInfo &DCI) {
6465 SDValue Op = N->getOperand(0);
6466
6467 // If the source is a vldN-lane (N > 1) intrinsic, and all the other uses
6468 // of that intrinsic are also VDUPLANEs, combine them to a vldN-dup operation.
6469 if (CombineVLDDUP(N, DCI))
6470 return SDValue(N, 0);
6471
6472 // If the source is already a VMOVIMM or VMVNIMM splat, the VDUPLANE is
6473 // redundant. Ignore bit_converts for now; element sizes are checked below.
6474 while (Op.getOpcode() == ISD::BITCAST)
6475 Op = Op.getOperand(0);
6476 if (Op.getOpcode() != ARMISD::VMOVIMM && Op.getOpcode() != ARMISD::VMVNIMM)
6477 return SDValue();
6478
6479 // Make sure the VMOV element size is not bigger than the VDUPLANE elements.
6480 unsigned EltSize = Op.getValueType().getVectorElementType().getSizeInBits();
6481 // The canonical VMOV for a zero vector uses a 32-bit element size.
6482 unsigned Imm = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
6483 unsigned EltBits;
6484 if (ARM_AM::decodeNEONModImm(Imm, EltBits) == 0)
6485 EltSize = 8;
6486 EVT VT = N->getValueType(0);
6487 if (EltSize > VT.getVectorElementType().getSizeInBits())
6488 return SDValue();
6489
6490 return DCI.DAG.getNode(ISD::BITCAST, N->getDebugLoc(), VT, Op);
6491 }
6492
6493 // isConstVecPow2 - Return true if each vector element is a power of 2, all
6494 // elements are the same constant, C, and Log2(C) ranges from 1 to 32.
6495 static bool isConstVecPow2(SDValue ConstVec, bool isSigned, uint64_t &C)
6496 {
6497 integerPart cN;
6498 integerPart c0 = 0;
6499 for (unsigned I = 0, E = ConstVec.getValueType().getVectorNumElements();
6500 I != E; I++) {
6501 ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(ConstVec.getOperand(I));
6502 if (!C)
6503 return false;
6504
6505 bool isExact;
6506 APFloat APF = C->getValueAPF();
6507 if (APF.convertToInteger(&cN, 64, isSigned, APFloat::rmTowardZero, &isExact)
6508 != APFloat::opOK || !isExact)
6509 return false;
6510
6511 c0 = (I == 0) ? cN : c0;
6512 if (!isPowerOf2_64(cN) || c0 != cN || Log2_64(c0) < 1 || Log2_64(c0) > 32)
6513 return false;
6514 }
6515 C = c0;
6516 return true;
6517 }
6518
6519 /// PerformVCVTCombine - VCVT (floating-point to fixed-point, Advanced SIMD)
6520 /// can replace combinations of VMUL and VCVT (floating-point to integer)
6521 /// when the VMUL has a constant operand that is a power of 2.
6522 ///
6523 /// Example (assume d17 = <float 8.000000e+00, float 8.000000e+00>):
6524 /// vmul.f32 d16, d17, d16
6525 /// vcvt.s32.f32 d16, d16
6526 /// becomes:
6527 /// vcvt.s32.f32 d16, d16, #3
6528 static SDValue PerformVCVTCombine(SDNode *N,
6529 TargetLowering::DAGCombinerInfo &DCI,
6530 const ARMSubtarget *Subtarget) {
6531 SelectionDAG &DAG = DCI.DAG;
6532 SDValue Op = N->getOperand(0);
6533
6534 if (!Subtarget->hasNEON() || !Op.getValueType().isVector() ||
6535 Op.getOpcode() != ISD::FMUL)
6536 return SDValue();
6537
6538 uint64_t C;
6539 SDValue N0 = Op->getOperand(0);
6540 SDValue ConstVec = Op->getOperand(1);
6541 bool isSigned = N->getOpcode() == ISD::FP_TO_SINT;
6542
6543 if (ConstVec.getOpcode() != ISD::BUILD_VECTOR ||
6544 !isConstVecPow2(ConstVec, isSigned, C))
6545 return SDValue();
6546
6547 unsigned IntrinsicOpcode = isSigned ? Intrinsic::arm_neon_vcvtfp2fxs :
6548 Intrinsic::arm_neon_vcvtfp2fxu;
6549 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, N->getDebugLoc(),
6550 N->getValueType(0),
6551 DAG.getConstant(IntrinsicOpcode, MVT::i32), N0,
6552 DAG.getConstant(Log2_64(C), MVT::i32));
6553 }
6554
6555 /// PerformVDIVCombine - VCVT (fixed-point to floating-point, Advanced SIMD)
6556 /// can replace combinations of VCVT (integer to floating-point) and VDIV
6557 /// when the VDIV has a constant operand that is a power of 2.
6558 ///
6559 /// Example (assume d17 = <float 8.000000e+00, float 8.000000e+00>):
6560 /// vcvt.f32.s32 d16, d16
6561 /// vdiv.f32 d16, d17, d16
6562 /// becomes:
6563 /// vcvt.f32.s32 d16, d16, #3
6564 static SDValue PerformVDIVCombine(SDNode *N,
6565 TargetLowering::DAGCombinerInfo &DCI,
6566 const ARMSubtarget *Subtarget) {
6567 SelectionDAG &DAG = DCI.DAG;
6568 SDValue Op = N->getOperand(0);
6569 unsigned OpOpcode = Op.getNode()->getOpcode();
6570
6571 if (!Subtarget->hasNEON() || !N->getValueType(0).isVector() ||
6572 (OpOpcode != ISD::SINT_TO_FP && OpOpcode != ISD::UINT_TO_FP))
6573 return SDValue();
6574
6575 uint64_t C;
6576 SDValue ConstVec = N->getOperand(1);
6577 bool isSigned = OpOpcode == ISD::SINT_TO_FP;
6578
6579 if (ConstVec.getOpcode() != ISD::BUILD_VECTOR ||
6580 !isConstVecPow2(ConstVec, isSigned, C))
6581 return SDValue();
6582
6583 unsigned IntrinsicOpcode = isSigned ? Intrinsic::arm_neon_vcvtfxs2fp :
6584 Intrinsic::arm_neon_vcvtfxu2fp;
6585 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, N->getDebugLoc(),
6586 Op.getValueType(),
6587 DAG.getConstant(IntrinsicOpcode, MVT::i32),
6588 Op.getOperand(0), DAG.getConstant(Log2_64(C), MVT::i32));
6589 }
6590
6591 /// Getvshiftimm - Check if this is a valid build_vector for the immediate
6592 /// operand of a vector shift operation, where all the elements of the
6593 /// build_vector must have the same constant integer value.
6594 static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
6595 // Ignore bit_converts.
6596 while (Op.getOpcode() == ISD::BITCAST)
6597 Op = Op.getOperand(0);
6598 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
6599 APInt SplatBits, SplatUndef;
6600 unsigned SplatBitSize;
6601 bool HasAnyUndefs;
6602 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
6603 HasAnyUndefs, ElementBits) ||
6604 SplatBitSize > ElementBits)
6605 return false;
6606 Cnt = SplatBits.getSExtValue();
6607 return true;
6608 }
6609
6610 /// isVShiftLImm - Check if this is a valid build_vector for the immediate
6611 /// operand of a vector shift left operation. That value must be in the range:
6612 /// 0 <= Value < ElementBits for a left shift; or
6613 /// 0 <= Value <= ElementBits for a long left shift.
6614 static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
6615 assert(VT.isVector() && "vector shift count is not a vector type");
6616 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
6617 if (! getVShiftImm(Op, ElementBits, Cnt))
6618 return false;
6619 return (Cnt >= 0 && (isLong ? Cnt-1 : Cnt) < ElementBits);
6620 }
6621
6622 /// isVShiftRImm - Check if this is a valid build_vector for the immediate
6623 /// operand of a vector shift right operation. For a shift opcode, the value
6624 /// is positive, but for an intrinsic the value count must be negative. The
6625 /// absolute value must be in the range:
6626 /// 1 <= |Value| <= ElementBits for a right shift; or
6627 /// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
6628 static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
6629 int64_t &Cnt) {
6630 assert(VT.isVector() && "vector shift count is not a vector type");
6631 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
6632 if (! getVShiftImm(Op, ElementBits, Cnt))
6633 return false;
6634 if (isIntrinsic)
6635 Cnt = -Cnt;
6636 return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits/2 : ElementBits));
6637 }
6638
6639 /// PerformIntrinsicCombine - ARM-specific DAG combining for intrinsics.
6640 static SDValue PerformIntrinsicCombine(SDNode *N, SelectionDAG &DAG) {
6641 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
6642 switch (IntNo) {
6643 default:
6644 // Don't do anything for most intrinsics.
6645 break;
6646
6647 // Vector shifts: check for immediate versions and lower them.
6648 // Note: This is done during DAG combining instead of DAG legalizing because
6649 // the build_vectors for 64-bit vector element shift counts are generally
6650 // not legal, and it is hard to see their values after they get legalized to
6651 // loads from a constant pool.
6652 case Intrinsic::arm_neon_vshifts:
6653 case Intrinsic::arm_neon_vshiftu:
6654 case Intrinsic::arm_neon_vshiftls:
6655 case Intrinsic::arm_neon_vshiftlu:
6656 case Intrinsic::arm_neon_vshiftn:
6657 case Intrinsic::arm_neon_vrshifts:
6658 case Intrinsic::arm_neon_vrshiftu:
6659 case Intrinsic::arm_neon_vrshiftn:
6660 case Intrinsic::arm_neon_vqshifts:
6661 case Intrinsic::arm_neon_vqshiftu:
6662 case Intrinsic::arm_neon_vqshiftsu:
6663 case Intrinsic::arm_neon_vqshiftns:
6664 case Intrinsic::arm_neon_vqshiftnu:
6665 case Intrinsic::arm_neon_vqshiftnsu:
6666 case Intrinsic::arm_neon_vqrshiftns:
6667 case Intrinsic::arm_neon_vqrshiftnu:
6668 case Intrinsic::arm_neon_vqrshiftnsu: {
6669 EVT VT = N->getOperand(1).getValueType();
6670 int64_t Cnt;
6671 unsigned VShiftOpc = 0;
6672
6673 switch (IntNo) {
6674 case Intrinsic::arm_neon_vshifts:
6675 case Intrinsic::arm_neon_vshiftu:
6676 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) {
6677 VShiftOpc = ARMISD::VSHL;
6678 break;
6679 }
6680 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) {
6681 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshifts ?
6682 ARMISD::VSHRs : ARMISD::VSHRu);
6683 break;
6684 }
6685 return SDValue();
6686
6687 case Intrinsic::arm_neon_vshiftls:
6688 case Intrinsic::arm_neon_vshiftlu:
6689 if (isVShiftLImm(N->getOperand(2), VT, true, Cnt))
6690 break;
6691 llvm_unreachable("invalid shift count for vshll intrinsic");
6692
6693 case Intrinsic::arm_neon_vrshifts:
6694 case Intrinsic::arm_neon_vrshiftu:
6695 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt))
6696 break;
6697 return SDValue();
6698
6699 case Intrinsic::arm_neon_vqshifts:
6700 case Intrinsic::arm_neon_vqshiftu:
6701 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
6702 break;
6703 return SDValue();
6704
6705 case Intrinsic::arm_neon_vqshiftsu:
6706 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
6707 break;
6708 llvm_unreachable("invalid shift count for vqshlu intrinsic");
6709
6710 case Intrinsic::arm_neon_vshiftn:
6711 case Intrinsic::arm_neon_vrshiftn:
6712 case Intrinsic::arm_neon_vqshiftns:
6713 case Intrinsic::arm_neon_vqshiftnu:
6714 case Intrinsic::arm_neon_vqshiftnsu:
6715 case Intrinsic::arm_neon_vqrshiftns:
6716 case Intrinsic::arm_neon_vqrshiftnu:
6717 case Intrinsic::arm_neon_vqrshiftnsu:
6718 // Narrowing shifts require an immediate right shift.
6719 if (isVShiftRImm(N->getOperand(2), VT, true, true, Cnt))
6720 break;
6721 llvm_unreachable("invalid shift count for narrowing vector shift "
6722 "intrinsic");
6723
6724 default:
6725 llvm_unreachable("unhandled vector shift");
6726 }
6727
6728 switch (IntNo) {
6729 case Intrinsic::arm_neon_vshifts:
6730 case Intrinsic::arm_neon_vshiftu:
6731 // Opcode already set above.
6732 break;
6733 case Intrinsic::arm_neon_vshiftls:
6734 case Intrinsic::arm_neon_vshiftlu:
6735 if (Cnt == VT.getVectorElementType().getSizeInBits())
6736 VShiftOpc = ARMISD::VSHLLi;
6737 else
6738 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshiftls ?
6739 ARMISD::VSHLLs : ARMISD::VSHLLu);
6740 break;
6741 case Intrinsic::arm_neon_vshiftn:
6742 VShiftOpc = ARMISD::VSHRN; break;
6743 case Intrinsic::arm_neon_vrshifts:
6744 VShiftOpc = ARMISD::VRSHRs; break;
6745 case Intrinsic::arm_neon_vrshiftu:
6746 VShiftOpc = ARMISD::VRSHRu; break;
6747 case Intrinsic::arm_neon_vrshiftn:
6748 VShiftOpc = ARMISD::VRSHRN; break;
6749 case Intrinsic::arm_neon_vqshifts:
6750 VShiftOpc = ARMISD::VQSHLs; break;
6751 case Intrinsic::arm_neon_vqshiftu:
6752 VShiftOpc = ARMISD::VQSHLu; break;
6753 case Intrinsic::arm_neon_vqshiftsu:
6754 VShiftOpc = ARMISD::VQSHLsu; break;
6755 case Intrinsic::arm_neon_vqshiftns:
6756 VShiftOpc = ARMISD::VQSHRNs; break;
6757 case Intrinsic::arm_neon_vqshiftnu:
6758 VShiftOpc = ARMISD::VQSHRNu; break;
6759 case Intrinsic::arm_neon_vqshiftnsu:
6760 VShiftOpc = ARMISD::VQSHRNsu; break;
6761 case Intrinsic::arm_neon_vqrshiftns:
6762 VShiftOpc = ARMISD::VQRSHRNs; break;
6763 case Intrinsic::arm_neon_vqrshiftnu:
6764 VShiftOpc = ARMISD::VQRSHRNu; break;
6765 case Intrinsic::arm_neon_vqrshiftnsu:
6766 VShiftOpc = ARMISD::VQRSHRNsu; break;
6767 }
6768
6769 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
6770 N->getOperand(1), DAG.getConstant(Cnt, MVT::i32));
6771 }
6772
6773 case Intrinsic::arm_neon_vshiftins: {
6774 EVT VT = N->getOperand(1).getValueType();
6775 int64_t Cnt;
6776 unsigned VShiftOpc = 0;
6777
6778 if (isVShiftLImm(N->getOperand(3), VT, false, Cnt))
6779 VShiftOpc = ARMISD::VSLI;
6780 else if (isVShiftRImm(N->getOperand(3), VT, false, true, Cnt))
6781 VShiftOpc = ARMISD::VSRI;
6782 else {
6783 llvm_unreachable("invalid shift count for vsli/vsri intrinsic");
6784 }
6785
6786 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
6787 N->getOperand(1), N->getOperand(2),
6788 DAG.getConstant(Cnt, MVT::i32));
6789 }
6790
6791 case Intrinsic::arm_neon_vqrshifts:
6792 case Intrinsic::arm_neon_vqrshiftu:
6793 // No immediate versions of these to check for.
6794 break;
6795 }
6796
6797 return SDValue();
6798 }
6799
6800 /// PerformShiftCombine - Checks for immediate versions of vector shifts and
6801 /// lowers them. As with the vector shift intrinsics, this is done during DAG
6802 /// combining instead of DAG legalizing because the build_vectors for 64-bit
6803 /// vector element shift counts are generally not legal, and it is hard to see
6804 /// their values after they get legalized to loads from a constant pool.
6805 static SDValue PerformShiftCombine(SDNode *N, SelectionDAG &DAG,
6806 const ARMSubtarget *ST) {
6807 EVT VT = N->getValueType(0);
6808
6809 // Nothing to be done for scalar shifts.
6810 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
6811 if (!VT.isVector() || !TLI.isTypeLegal(VT))
6812 return SDValue();
6813
6814 assert(ST->hasNEON() && "unexpected vector shift");
6815 int64_t Cnt;
6816
6817 switch (N->getOpcode()) {
6818 default: llvm_unreachable("unexpected shift opcode");
6819
6820 case ISD::SHL:
6821 if (isVShiftLImm(N->getOperand(1), VT, false, Cnt))
6822 return DAG.getNode(ARMISD::VSHL, N->getDebugLoc(), VT, N->getOperand(0),
6823 DAG.getConstant(Cnt, MVT::i32));
6824 break;
6825
6826 case ISD::SRA:
6827 case ISD::SRL:
6828 if (isVShiftRImm(N->getOperand(1), VT, false, false, Cnt)) {
6829 unsigned VShiftOpc = (N->getOpcode() == ISD::SRA ?
6830 ARMISD::VSHRs : ARMISD::VSHRu);
6831 return DAG.getNode(VShiftOpc, N->getDebugLoc(), VT, N->getOperand(0),
6832 DAG.getConstant(Cnt, MVT::i32));
6833 }
6834 }
6835 return SDValue();
6836 }
6837
6838 /// PerformExtendCombine - Target-specific DAG combining for ISD::SIGN_EXTEND,
6839 /// ISD::ZERO_EXTEND, and ISD::ANY_EXTEND.
6840 static SDValue PerformExtendCombine(SDNode *N, SelectionDAG &DAG,
6841 const ARMSubtarget *ST) {
6842 SDValue N0 = N->getOperand(0);
6843
6844 // Check for sign- and zero-extensions of vector extract operations of 8-
6845 // and 16-bit vector elements. NEON supports these directly. They are
6846 // handled during DAG combining because type legalization will promote them
6847 // to 32-bit types and it is messy to recognize the operations after that.
6848 if (ST->hasNEON() && N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
6849 SDValue Vec = N0.getOperand(0);
6850 SDValue Lane = N0.getOperand(1);
6851 EVT VT = N->getValueType(0);
6852 EVT EltVT = N0.getValueType();
6853 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
6854
6855 if (VT == MVT::i32 &&
6856 (EltVT == MVT::i8 || EltVT == MVT::i16) &&
6857 TLI.isTypeLegal(Vec.getValueType()) &&
6858 isa<ConstantSDNode>(Lane)) {
6859
6860 unsigned Opc = 0;
6861 switch (N->getOpcode()) {
6862 default: llvm_unreachable("unexpected opcode");
6863 case ISD::SIGN_EXTEND:
6864 Opc = ARMISD::VGETLANEs;
6865 break;
6866 case ISD::ZERO_EXTEND:
6867 case ISD::ANY_EXTEND:
6868 Opc = ARMISD::VGETLANEu;
6869 break;
6870 }
6871 return DAG.getNode(Opc, N->getDebugLoc(), VT, Vec, Lane);
6872 }
6873 }
6874
6875 return SDValue();
6876 }
6877
6878 /// PerformSELECT_CCCombine - Target-specific DAG combining for ISD::SELECT_CC
6879 /// to match f32 max/min patterns to use NEON vmax/vmin instructions.
6880 static SDValue PerformSELECT_CCCombine(SDNode *N, SelectionDAG &DAG,
6881 const ARMSubtarget *ST) {
6882 // If the target supports NEON, try to use vmax/vmin instructions for f32
6883 // selects like "x < y ? x : y". Unless the NoNaNsFPMath option is set,
6884 // be careful about NaNs: NEON's vmax/vmin return NaN if either operand is
6885 // a NaN; only do the transformation when it matches that behavior.
6886
6887 // For now only do this when using NEON for FP operations; if using VFP, it
6888 // is not obvious that the benefit outweighs the cost of switching to the
6889 // NEON pipeline.
6890 if (!ST->hasNEON() || !ST->useNEONForSinglePrecisionFP() ||
6891 N->getValueType(0) != MVT::f32)
6892 return SDValue();
6893
6894 SDValue CondLHS = N->getOperand(0);
6895 SDValue CondRHS = N->getOperand(1);
6896 SDValue LHS = N->getOperand(2);
6897 SDValue RHS = N->getOperand(3);
6898 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
6899
6900 unsigned Opcode = 0;
6901 bool IsReversed;
6902 if (DAG.isEqualTo(LHS, CondLHS) && DAG.isEqualTo(RHS, CondRHS)) {
6903 IsReversed = false; // x CC y ? x : y
6904 } else if (DAG.isEqualTo(LHS, CondRHS) && DAG.isEqualTo(RHS, CondLHS)) {
6905 IsReversed = true ; // x CC y ? y : x
6906 } else {
6907 return SDValue();
6908 }
6909
6910 bool IsUnordered;
6911 switch (CC) {
6912 default: break;
6913 case ISD::SETOLT:
6914 case ISD::SETOLE:
6915 case ISD::SETLT:
6916 case ISD::SETLE:
6917 case ISD::SETULT:
6918 case ISD::SETULE:
6919 // If LHS is NaN, an ordered comparison will be false and the result will
6920 // be the RHS, but vmin(NaN, RHS) = NaN. Avoid this by checking that LHS
6921 // != NaN. Likewise, for unordered comparisons, check for RHS != NaN.
6922 IsUnordered = (CC == ISD::SETULT || CC == ISD::SETULE);
6923 if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS))
6924 break;
6925 // For less-than-or-equal comparisons, "+0 <= -0" will be true but vmin
6926 // will return -0, so vmin can only be used for unsafe math or if one of
6927 // the operands is known to be nonzero.
6928 if ((CC == ISD::SETLE || CC == ISD::SETOLE || CC == ISD::SETULE) &&
6929 !UnsafeFPMath &&
6930 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
6931 break;
6932 Opcode = IsReversed ? ARMISD::FMAX : ARMISD::FMIN;
6933 break;
6934
6935 case ISD::SETOGT:
6936 case ISD::SETOGE:
6937 case ISD::SETGT:
6938 case ISD::SETGE:
6939 case ISD::SETUGT:
6940 case ISD::SETUGE:
6941 // If LHS is NaN, an ordered comparison will be false and the result will
6942 // be the RHS, but vmax(NaN, RHS) = NaN. Avoid this by checking that LHS
6943 // != NaN. Likewise, for unordered comparisons, check for RHS != NaN.
6944 IsUnordered = (CC == ISD::SETUGT || CC == ISD::SETUGE);
6945 if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS))
6946 break;
6947 // For greater-than-or-equal comparisons, "-0 >= +0" will be true but vmax
6948 // will return +0, so vmax can only be used for unsafe math or if one of
6949 // the operands is known to be nonzero.
6950 if ((CC == ISD::SETGE || CC == ISD::SETOGE || CC == ISD::SETUGE) &&
6951 !UnsafeFPMath &&
6952 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
6953 break;
6954 Opcode = IsReversed ? ARMISD::FMIN : ARMISD::FMAX;
6955 break;
6956 }
6957
6958 if (!Opcode)
6959 return SDValue();
6960 return DAG.getNode(Opcode, N->getDebugLoc(), N->getValueType(0), LHS, RHS);
6961 }
6962
6963 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
6964 DAGCombinerInfo &DCI) const {
6965 switch (N->getOpcode()) {
6966 default: break;
6967 case ISD::ADD: return PerformADDCombine(N, DCI, Subtarget);
6968 case ISD::SUB: return PerformSUBCombine(N, DCI);
6969 case ISD::MUL: return PerformMULCombine(N, DCI, Subtarget);
6970 case ISD::OR: return PerformORCombine(N, DCI, Subtarget);
6971 case ISD::AND: return PerformANDCombine(N, DCI);
6972 case ARMISD::BFI: return PerformBFICombine(N, DCI);
6973 case ARMISD::VMOVRRD: return PerformVMOVRRDCombine(N, DCI);
6974 case ARMISD::VMOVDRR: return PerformVMOVDRRCombine(N, DCI.DAG);
6975 case ISD::STORE: return PerformSTORECombine(N, DCI);
6976 case ISD::BUILD_VECTOR: return PerformBUILD_VECTORCombine(N, DCI);
6977 case ISD::INSERT_VECTOR_ELT: return PerformInsertEltCombine(N, DCI);
6978 case ISD::VECTOR_SHUFFLE: return PerformVECTOR_SHUFFLECombine(N, DCI.DAG);
6979 case ARMISD::VDUPLANE: return PerformVDUPLANECombine(N, DCI);
6980 case ISD::FP_TO_SINT:
6981 case ISD::FP_TO_UINT: return PerformVCVTCombine(N, DCI, Subtarget);
6982 case ISD::FDIV: return PerformVDIVCombine(N, DCI, Subtarget);
6983 case ISD::INTRINSIC_WO_CHAIN: return PerformIntrinsicCombine(N, DCI.DAG);
6984 case ISD::SHL:
6985 case ISD::SRA:
6986 case ISD::SRL: return PerformShiftCombine(N, DCI.DAG, Subtarget);
6987 case ISD::SIGN_EXTEND:
6988 case ISD::ZERO_EXTEND:
6989 case ISD::ANY_EXTEND: return PerformExtendCombine(N, DCI.DAG, Subtarget);
6990 case ISD::SELECT_CC: return PerformSELECT_CCCombine(N, DCI.DAG, Subtarget);
6991 case ARMISD::VLD2DUP:
6992 case ARMISD::VLD3DUP:
6993 case ARMISD::VLD4DUP:
6994 return CombineBaseUpdate(N, DCI);
6995 case ISD::INTRINSIC_VOID:
6996 case ISD::INTRINSIC_W_CHAIN:
6997 switch (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue()) {
6998 case Intrinsic::arm_neon_vld1:
6999 case Intrinsic::arm_neon_vld2:
7000 case Intrinsic::arm_neon_vld3:
7001 case Intrinsic::arm_neon_vld4:
7002 case Intrinsic::arm_neon_vld2lane:
7003 case Intrinsic::arm_neon_vld3lane:
7004 case Intrinsic::arm_neon_vld4lane:
7005 case Intrinsic::arm_neon_vst1:
7006 case Intrinsic::arm_neon_vst2:
7007 case Intrinsic::arm_neon_vst3:
7008 case Intrinsic::arm_neon_vst4:
7009 case Intrinsic::arm_neon_vst2lane:
7010 case Intrinsic::arm_neon_vst3lane:
7011 case Intrinsic::arm_neon_vst4lane:
7012 return CombineBaseUpdate(N, DCI);
7013 default: break;
7014 }
7015 break;
7016 }
7017 return SDValue();
7018 }
7019
7020 bool ARMTargetLowering::isDesirableToTransformToIntegerOp(unsigned Opc,
7021 EVT VT) const {
7022 return (VT == MVT::f32) && (Opc == ISD::LOAD || Opc == ISD::STORE);
7023 }
7024
7025 bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
7026 if (!Subtarget->allowsUnalignedMem())
7027 return false;
7028
7029 switch (VT.getSimpleVT().SimpleTy) {
7030 default:
7031 return false;
7032 case MVT::i8:
7033 case MVT::i16:
7034 case MVT::i32:
7035 return true;
7036 // FIXME: VLD1 etc with standard alignment is legal.
7037 }
7038 }
7039
7040 static bool isLegalT1AddressImmediate(int64_t V, EVT VT) {
7041 if (V < 0)
7042 return false;
7043
7044 unsigned Scale = 1;
7045 switch (VT.getSimpleVT().SimpleTy) {
7046 default: return false;
7047 case MVT::i1:
7048 case MVT::i8:
7049 // Scale == 1;
7050 break;
7051 case MVT::i16:
7052 // Scale == 2;
7053 Scale = 2;
7054 break;
7055 case MVT::i32:
7056 // Scale == 4;
7057 Scale = 4;
7058 break;
7059 }
7060
7061 if ((V & (Scale - 1)) != 0)
7062 return false;
7063 V /= Scale;
7064 return V == (V & ((1LL << 5) - 1));
7065 }
7066
7067 static bool isLegalT2AddressImmediate(int64_t V, EVT VT,
7068 const ARMSubtarget *Subtarget) {
7069 bool isNeg = false;
7070 if (V < 0) {
7071 isNeg = true;
7072 V = - V;
7073 }
7074
7075 switch (VT.getSimpleVT().SimpleTy) {
7076 default: return false;
7077 case MVT::i1:
7078 case MVT::i8:
7079 case MVT::i16:
7080 case MVT::i32:
7081 // + imm12 or - imm8
7082 if (isNeg)
7083 return V == (V & ((1LL << 8) - 1));
7084 return V == (V & ((1LL << 12) - 1));
7085 case MVT::f32:
7086 case MVT::f64:
7087 // Same as ARM mode. FIXME: NEON?
7088 if (!Subtarget->hasVFP2())
7089 return false;
7090 if ((V & 3) != 0)
7091 return false;
7092 V >>= 2;
7093 return V == (V & ((1LL << 8) - 1));
7094 }
7095 }
7096
7097 /// isLegalAddressImmediate - Return true if the integer value can be used
7098 /// as the offset of the target addressing mode for load / store of the
7099 /// given type.
7100 static bool isLegalAddressImmediate(int64_t V, EVT VT,
7101 const ARMSubtarget *Subtarget) {
7102 if (V == 0)
7103 return true;
7104
7105 if (!VT.isSimple())
7106 return false;
7107
7108 if (Subtarget->isThumb1Only())
7109 return isLegalT1AddressImmediate(V, VT);
7110 else if (Subtarget->isThumb2())
7111 return isLegalT2AddressImmediate(V, VT, Subtarget);
7112
7113 // ARM mode.
7114 if (V < 0)
7115 V = - V;
7116 switch (VT.getSimpleVT().SimpleTy) {
7117 default: return false;
7118 case MVT::i1:
7119 case MVT::i8:
7120 case MVT::i32:
7121 // +- imm12
7122 return V == (V & ((1LL << 12) - 1));
7123 case MVT::i16:
7124 // +- imm8
7125 return V == (V & ((1LL << 8) - 1));
7126 case MVT::f32:
7127 case MVT::f64:
7128 if (!Subtarget->hasVFP2()) // FIXME: NEON?
7129 return false;
7130 if ((V & 3) != 0)
7131 return false;
7132 V >>= 2;
7133 return V == (V & ((1LL << 8) - 1));
7134 }
7135 }
7136
7137 bool ARMTargetLowering::isLegalT2ScaledAddressingMode(const AddrMode &AM,
7138 EVT VT) const {
7139 int Scale = AM.Scale;
7140 if (Scale < 0)
7141 return false;
7142
7143 switch (VT.getSimpleVT().SimpleTy) {
7144 default: return false;
7145 case MVT::i1:
7146 case MVT::i8:
7147 case MVT::i16:
7148 case MVT::i32:
7149 if (Scale == 1)
7150 return true;
7151 // r + r << imm
7152 Scale = Scale & ~1;
7153 return Scale == 2 || Scale == 4 || Scale == 8;
7154 case MVT::i64:
7155 // r + r
7156 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
7157 return true;
7158 return false;
7159 case MVT::isVoid:
7160 // Note, we allow "void" uses (basically, uses that aren't loads or
7161 // stores), because arm allows folding a scale into many arithmetic
7162 // operations. This should be made more precise and revisited later.
7163
7164 // Allow r << imm, but the imm has to be a multiple of two.
7165 if (Scale & 1) return false;
7166 return isPowerOf2_32(Scale);
7167 }
7168 }
7169
7170 /// isLegalAddressingMode - Return true if the addressing mode represented
7171 /// by AM is legal for this target, for a load/store of the specified type.
7172 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
7173 const Type *Ty) const {
7174 EVT VT = getValueType(Ty, true);
7175 if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget))
7176 return false;
7177
7178 // Can never fold addr of global into load/store.
7179 if (AM.BaseGV)
7180 return false;
7181
7182 switch (AM.Scale) {
7183 case 0: // no scale reg, must be "r+i" or "r", or "i".
7184 break;
7185 case 1:
7186 if (Subtarget->isThumb1Only())
7187 return false;
7188 // FALL THROUGH.
7189 default:
7190 // ARM doesn't support any R+R*scale+imm addr modes.
7191 if (AM.BaseOffs)
7192 return false;
7193
7194 if (!VT.isSimple())
7195 return false;
7196
7197 if (Subtarget->isThumb2())
7198 return isLegalT2ScaledAddressingMode(AM, VT);
7199
7200 int Scale = AM.Scale;
7201 switch (VT.getSimpleVT().SimpleTy) {
7202 default: return false;
7203 case MVT::i1:
7204 case MVT::i8:
7205 case MVT::i32:
7206 if (Scale < 0) Scale = -Scale;
7207 if (Scale == 1)
7208 return true;
7209 // r + r << imm
7210 return isPowerOf2_32(Scale & ~1);
7211 case MVT::i16:
7212 case MVT::i64:
7213 // r + r
7214 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
7215 return true;
7216 return false;
7217
7218 case MVT::isVoid:
7219 // Note, we allow "void" uses (basically, uses that aren't loads or
7220 // stores), because arm allows folding a scale into many arithmetic
7221 // operations. This should be made more precise and revisited later.
7222
7223 // Allow r << imm, but the imm has to be a multiple of two.
7224 if (Scale & 1) return false;
7225 return isPowerOf2_32(Scale);
7226 }
7227 break;
7228 }
7229 return true;
7230 }
7231
7232 /// isLegalICmpImmediate - Return true if the specified immediate is legal
7233 /// icmp immediate, that is the target has icmp instructions which can compare
7234 /// a register against the immediate without having to materialize the
7235 /// immediate into a register.
7236 bool ARMTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
7237 if (!Subtarget->isThumb())
7238 return ARM_AM::getSOImmVal(Imm) != -1;
7239 if (Subtarget->isThumb2())
7240 return ARM_AM::getT2SOImmVal(Imm) != -1;
7241 return Imm >= 0 && Imm <= 255;
7242 }
7243
7244 /// isLegalAddImmediate - Return true if the specified immediate is legal
7245 /// add immediate, that is the target has add instructions which can add
7246 /// a register with the immediate without having to materialize the
7247 /// immediate into a register.
7248 bool ARMTargetLowering::isLegalAddImmediate(int64_t Imm) const {
7249 return ARM_AM::getSOImmVal(Imm) != -1;
7250 }
7251
7252 static bool getARMIndexedAddressParts(SDNode *Ptr, EVT VT,
7253 bool isSEXTLoad, SDValue &Base,
7254 SDValue &Offset, bool &isInc,
7255 SelectionDAG &DAG) {
7256 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
7257 return false;
7258
7259 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
7260 // AddressingMode 3
7261 Base = Ptr->getOperand(0);
7262 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
7263 int RHSC = (int)RHS->getZExtValue();
7264 if (RHSC < 0 && RHSC > -256) {
7265 assert(Ptr->getOpcode() == ISD::ADD);
7266 isInc = false;
7267 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
7268 return true;
7269 }
7270 }
7271 isInc = (Ptr->getOpcode() == ISD::ADD);
7272 Offset = Ptr->getOperand(1);
7273 return true;
7274 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
7275 // AddressingMode 2
7276 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
7277 int RHSC = (int)RHS->getZExtValue();
7278 if (RHSC < 0 && RHSC > -0x1000) {
7279 assert(Ptr->getOpcode() == ISD::ADD);
7280 isInc = false;
7281 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
7282 Base = Ptr->getOperand(0);
7283 return true;
7284 }
7285 }
7286
7287 if (Ptr->getOpcode() == ISD::ADD) {
7288 isInc = true;
7289 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
7290 if (ShOpcVal != ARM_AM::no_shift) {
7291 Base = Ptr->getOperand(1);
7292 Offset = Ptr->getOperand(0);
7293 } else {
7294 Base = Ptr->getOperand(0);
7295 Offset = Ptr->getOperand(1);
7296 }
7297 return true;
7298 }
7299
7300 isInc = (Ptr->getOpcode() == ISD::ADD);
7301 Base = Ptr->getOperand(0);
7302 Offset = Ptr->getOperand(1);
7303 return true;
7304 }
7305
7306 // FIXME: Use VLDM / VSTM to emulate indexed FP load / store.
7307 return false;
7308 }
7309
7310 static bool getT2IndexedAddressParts(SDNode *Ptr, EVT VT,
7311 bool isSEXTLoad, SDValue &Base,
7312 SDValue &Offset, bool &isInc,
7313 SelectionDAG &DAG) {
7314 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
7315 return false;
7316
7317 Base = Ptr->getOperand(0);
7318 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
7319 int RHSC = (int)RHS->getZExtValue();
7320 if (RHSC < 0 && RHSC > -0x100) { // 8 bits.
7321 assert(Ptr->getOpcode() == ISD::ADD);
7322 isInc = false;
7323 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
7324 return true;
7325 } else if (RHSC > 0 && RHSC < 0x100) { // 8 bit, no zero.
7326 isInc = Ptr->getOpcode() == ISD::ADD;
7327 Offset = DAG.getConstant(RHSC, RHS->getValueType(0));
7328 return true;
7329 }
7330 }
7331
7332 return false;
7333 }
7334
7335 /// getPreIndexedAddressParts - returns true by value, base pointer and
7336 /// offset pointer and addressing mode by reference if the node's address
7337 /// can be legally represented as pre-indexed load / store address.
7338 bool
7339 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
7340 SDValue &Offset,
7341 ISD::MemIndexedMode &AM,
7342 SelectionDAG &DAG) const {
7343 if (Subtarget->isThumb1Only())
7344 return false;
7345
7346 EVT VT;
7347 SDValue Ptr;
7348 bool isSEXTLoad = false;
7349 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
7350 Ptr = LD->getBasePtr();
7351 VT = LD->getMemoryVT();
7352 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
7353 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
7354 Ptr = ST->getBasePtr();
7355 VT = ST->getMemoryVT();
7356 } else
7357 return false;
7358
7359 bool isInc;
7360 bool isLegal = false;
7361 if (Subtarget->isThumb2())
7362 isLegal = getT2IndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
7363 Offset, isInc, DAG);
7364 else
7365 isLegal = getARMIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
7366 Offset, isInc, DAG);
7367 if (!isLegal)
7368 return false;
7369
7370 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
7371 return true;
7372 }
7373
7374 /// getPostIndexedAddressParts - returns true by value, base pointer and
7375 /// offset pointer and addressing mode by reference if this node can be
7376 /// combined with a load / store to form a post-indexed load / store.
7377 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
7378 SDValue &Base,
7379 SDValue &Offset,
7380 ISD::MemIndexedMode &AM,
7381 SelectionDAG &DAG) const {
7382 if (Subtarget->isThumb1Only())
7383 return false;
7384
7385 EVT VT;
7386 SDValue Ptr;
7387 bool isSEXTLoad = false;
7388 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
7389 VT = LD->getMemoryVT();
7390 Ptr = LD->getBasePtr();
7391 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
7392 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
7393 VT = ST->getMemoryVT();
7394 Ptr = ST->getBasePtr();
7395 } else
7396 return false;
7397
7398 bool isInc;
7399 bool isLegal = false;
7400 if (Subtarget->isThumb2())
7401 isLegal = getT2IndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
7402 isInc, DAG);
7403 else
7404 isLegal = getARMIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
7405 isInc, DAG);
7406 if (!isLegal)
7407 return false;
7408
7409 if (Ptr != Base) {
7410 // Swap base ptr and offset to catch more post-index load / store when
7411 // it's legal. In Thumb2 mode, offset must be an immediate.
7412 if (Ptr == Offset && Op->getOpcode() == ISD::ADD &&
7413 !Subtarget->isThumb2())
7414 std::swap(Base, Offset);
7415
7416 // Post-indexed load / store update the base pointer.
7417 if (Ptr != Base)
7418 return false;
7419 }
7420
7421 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
7422 return true;
7423 }
7424
7425 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
7426 const APInt &Mask,
7427 APInt &KnownZero,
7428 APInt &KnownOne,
7429 const SelectionDAG &DAG,
7430 unsigned Depth) const {
7431 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
7432 switch (Op.getOpcode()) {
7433 default: break;
7434 case ARMISD::CMOV: {
7435 // Bits are known zero/one if known on the LHS and RHS.
7436 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
7437 if (KnownZero == 0 && KnownOne == 0) return;
7438
7439 APInt KnownZeroRHS, KnownOneRHS;
7440 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
7441 KnownZeroRHS, KnownOneRHS, Depth+1);
7442 KnownZero &= KnownZeroRHS;
7443 KnownOne &= KnownOneRHS;
7444 return;
7445 }
7446 }
7447 }
7448
7449 //===----------------------------------------------------------------------===//
7450 // ARM Inline Assembly Support
7451 //===----------------------------------------------------------------------===//
7452
7453 bool ARMTargetLowering::ExpandInlineAsm(CallInst *CI) const {
7454 // Looking for "rev" which is V6+.
7455 if (!Subtarget->hasV6Ops())
7456 return false;
7457
7458 InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
7459 std::string AsmStr = IA->getAsmString();
7460 SmallVector<StringRef, 4> AsmPieces;
7461 SplitString(AsmStr, AsmPieces, ";\n");
7462
7463 switch (AsmPieces.size()) {
7464 default: return false;
7465 case 1:
7466 AsmStr = AsmPieces[0];
7467 AsmPieces.clear();
7468 SplitString(AsmStr, AsmPieces, " \t,");
7469
7470 // rev $0, $1
7471 if (AsmPieces.size() == 3 &&
7472 AsmPieces[0] == "rev" && AsmPieces[1] == "$0" && AsmPieces[2] == "$1" &&
7473 IA->getConstraintString().compare(0, 4, "=l,l") == 0) {
7474 const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
7475 if (Ty && Ty->getBitWidth() == 32)
7476 return IntrinsicLowering::LowerToByteSwap(CI);
7477 }
7478 break;
7479 }
7480
7481 return false;
7482 }
7483
7484 /// getConstraintType - Given a constraint letter, return the type of
7485 /// constraint it is for this target.
7486 ARMTargetLowering::ConstraintType
7487 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
7488 if (Constraint.size() == 1) {
7489 switch (Constraint[0]) {
7490 default: break;
7491 case 'l': return C_RegisterClass;
7492 case 'w': return C_RegisterClass;
7493 case 'h': return C_RegisterClass;
7494 case 'x': return C_RegisterClass;
7495 case 't': return C_RegisterClass;
7496 case 'j': return C_Other; // Constant for movw.
7497 }
7498 } else if (Constraint.size() == 2) {
7499 switch (Constraint[0]) {
7500 default: break;
7501 // All 'U+' constraints are addresses.
7502 case 'U': return C_Memory;
7503 }
7504 }
7505 return TargetLowering::getConstraintType(Constraint);
7506 }
7507
7508 /// Examine constraint type and operand type and determine a weight value.
7509 /// This object must already have been set up with the operand type
7510 /// and the current alternative constraint selected.
7511 TargetLowering::ConstraintWeight
7512 ARMTargetLowering::getSingleConstraintMatchWeight(
7513 AsmOperandInfo &info, const char *constraint) const {
7514 ConstraintWeight weight = CW_Invalid;
7515 Value *CallOperandVal = info.CallOperandVal;
7516 // If we don't have a value, we can't do a match,
7517 // but allow it at the lowest weight.
7518 if (CallOperandVal == NULL)
7519 return CW_Default;
7520 const Type *type = CallOperandVal->getType();
7521 // Look at the constraint type.
7522 switch (*constraint) {
7523 default:
7524 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
7525 break;
7526 case 'l':
7527 if (type->isIntegerTy()) {
7528 if (Subtarget->isThumb())
7529 weight = CW_SpecificReg;
7530 else
7531 weight = CW_Register;
7532 }
7533 break;
7534 case 'w':
7535 if (type->isFloatingPointTy())
7536 weight = CW_Register;
7537 break;
7538 }
7539 return weight;
7540 }
7541
7542 typedef std::pair<unsigned, const TargetRegisterClass*> RCPair;
7543 RCPair
7544 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
7545 EVT VT) const {
7546 if (Constraint.size() == 1) {
7547 // GCC ARM Constraint Letters
7548 switch (Constraint[0]) {
7549 case 'l': // Low regs or general regs.
7550 if (Subtarget->isThumb())
7551 return RCPair(0U, ARM::tGPRRegisterClass);
7552 else
7553 return RCPair(0U, ARM::GPRRegisterClass);
7554 case 'h': // High regs or no regs.
7555 if (Subtarget->isThumb())
7556 return RCPair(0U, ARM::hGPRRegisterClass);
7557 break;
7558 case 'r':
7559 return RCPair(0U, ARM::GPRRegisterClass);
7560 case 'w':
7561 if (VT == MVT::f32)
7562 return RCPair(0U, ARM::SPRRegisterClass);
7563 if (VT.getSizeInBits() == 64)
7564 return RCPair(0U, ARM::DPRRegisterClass);
7565 if (VT.getSizeInBits() == 128)
7566 return RCPair(0U, ARM::QPRRegisterClass);
7567 break;
7568 case 'x':
7569 if (VT == MVT::f32)
7570 return RCPair(0U, ARM::SPR_8RegisterClass);
7571 if (VT.getSizeInBits() == 64)
7572 return RCPair(0U, ARM::DPR_8RegisterClass);
7573 if (VT.getSizeInBits() == 128)
7574 return RCPair(0U, ARM::QPR_8RegisterClass);
7575 break;
7576 case 't':
7577 if (VT == MVT::f32)
7578 return RCPair(0U, ARM::SPRRegisterClass);
7579 break;
7580 }
7581 }
7582 if (StringRef("{cc}").equals_lower(Constraint))
7583 return std::make_pair(unsigned(ARM::CPSR), ARM::CCRRegisterClass);
7584
7585 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
7586 }
7587
7588 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
7589 /// vector. If it is invalid, don't add anything to Ops.
7590 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
7591 std::string &Constraint,
7592 std::vector<SDValue>&Ops,
7593 SelectionDAG &DAG) const {
7594 SDValue Result(0, 0);
7595
7596 // Currently only support length 1 constraints.
7597 if (Constraint.length() != 1) return;
7598
7599 char ConstraintLetter = Constraint[0];
7600 switch (ConstraintLetter) {
7601 default: break;
7602 case 'j':
7603 case 'I': case 'J': case 'K': case 'L':
7604 case 'M': case 'N': case 'O':
7605 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
7606 if (!C)
7607 return;
7608
7609 int64_t CVal64 = C->getSExtValue();
7610 int CVal = (int) CVal64;
7611 // None of these constraints allow values larger than 32 bits. Check
7612 // that the value fits in an int.
7613 if (CVal != CVal64)
7614 return;
7615
7616 switch (ConstraintLetter) {
7617 case 'j':
7618 // Constant suitable for movw, must be between 0 and
7619 // 65535.
7620 if (Subtarget->hasV6T2Ops())
7621 if (CVal >= 0 && CVal <= 65535)
7622 break;
7623 return;
7624 case 'I':
7625 if (Subtarget->isThumb1Only()) {
7626 // This must be a constant between 0 and 255, for ADD
7627 // immediates.
7628 if (CVal >= 0 && CVal <= 255)
7629 break;
7630 } else if (Subtarget->isThumb2()) {
7631 // A constant that can be used as an immediate value in a
7632 // data-processing instruction.
7633 if (ARM_AM::getT2SOImmVal(CVal) != -1)
7634 break;
7635 } else {
7636 // A constant that can be used as an immediate value in a
7637 // data-processing instruction.
7638 if (ARM_AM::getSOImmVal(CVal) != -1)
7639 break;
7640 }
7641 return;
7642
7643 case 'J':
7644 if (Subtarget->isThumb()) { // FIXME thumb2
7645 // This must be a constant between -255 and -1, for negated ADD
7646 // immediates. This can be used in GCC with an "n" modifier that
7647 // prints the negated value, for use with SUB instructions. It is
7648 // not useful otherwise but is implemented for compatibility.
7649 if (CVal >= -255 && CVal <= -1)
7650 break;
7651 } else {
7652 // This must be a constant between -4095 and 4095. It is not clear
7653 // what this constraint is intended for. Implemented for
7654 // compatibility with GCC.
7655 if (CVal >= -4095 && CVal <= 4095)
7656 break;
7657 }
7658 return;
7659
7660 case 'K':
7661 if (Subtarget->isThumb1Only()) {
7662 // A 32-bit value where only one byte has a nonzero value. Exclude
7663 // zero to match GCC. This constraint is used by GCC internally for
7664 // constants that can be loaded with a move/shift combination.
7665 // It is not useful otherwise but is implemented for compatibility.
7666 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
7667 break;
7668 } else if (Subtarget->isThumb2()) {
7669 // A constant whose bitwise inverse can be used as an immediate
7670 // value in a data-processing instruction. This can be used in GCC
7671 // with a "B" modifier that prints the inverted value, for use with
7672 // BIC and MVN instructions. It is not useful otherwise but is
7673 // implemented for compatibility.
7674 if (ARM_AM::getT2SOImmVal(~CVal) != -1)
7675 break;
7676 } else {
7677 // A constant whose bitwise inverse can be used as an immediate
7678 // value in a data-processing instruction. This can be used in GCC
7679 // with a "B" modifier that prints the inverted value, for use with
7680 // BIC and MVN instructions. It is not useful otherwise but is
7681 // implemented for compatibility.
7682 if (ARM_AM::getSOImmVal(~CVal) != -1)
7683 break;
7684 }
7685 return;
7686
7687 case 'L':
7688 if (Subtarget->isThumb1Only()) {
7689 // This must be a constant between -7 and 7,
7690 // for 3-operand ADD/SUB immediate instructions.
7691 if (CVal >= -7 && CVal < 7)
7692 break;
7693 } else if (Subtarget->isThumb2()) {
7694 // A constant whose negation can be used as an immediate value in a
7695 // data-processing instruction. This can be used in GCC with an "n"
7696 // modifier that prints the negated value, for use with SUB
7697 // instructions. It is not useful otherwise but is implemented for
7698 // compatibility.
7699 if (ARM_AM::getT2SOImmVal(-CVal) != -1)
7700 break;
7701 } else {
7702 // A constant whose negation can be used as an immediate value in a
7703 // data-processing instruction. This can be used in GCC with an "n"
7704 // modifier that prints the negated value, for use with SUB
7705 // instructions. It is not useful otherwise but is implemented for
7706 // compatibility.
7707 if (ARM_AM::getSOImmVal(-CVal) != -1)
7708 break;
7709 }
7710 return;
7711
7712 case 'M':
7713 if (Subtarget->isThumb()) { // FIXME thumb2
7714 // This must be a multiple of 4 between 0 and 1020, for
7715 // ADD sp + immediate.
7716 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
7717 break;
7718 } else {
7719 // A power of two or a constant between 0 and 32. This is used in
7720 // GCC for the shift amount on shifted register operands, but it is
7721 // useful in general for any shift amounts.
7722 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
7723 break;
7724 }
7725 return;
7726
7727 case 'N':
7728 if (Subtarget->isThumb()) { // FIXME thumb2
7729 // This must be a constant between 0 and 31, for shift amounts.
7730 if (CVal >= 0 && CVal <= 31)
7731 break;
7732 }
7733 return;
7734
7735 case 'O':
7736 if (Subtarget->isThumb()) { // FIXME thumb2
7737 // This must be a multiple of 4 between -508 and 508, for
7738 // ADD/SUB sp = sp + immediate.
7739 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
7740 break;
7741 }
7742 return;
7743 }
7744 Result = DAG.getTargetConstant(CVal, Op.getValueType());
7745 break;
7746 }
7747
7748 if (Result.getNode()) {
7749 Ops.push_back(Result);
7750 return;
7751 }
7752 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
7753 }
7754
7755 bool
7756 ARMTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
7757 // The ARM target isn't yet aware of offsets.
7758 return false;
7759 }
7760
7761 int ARM::getVFPf32Imm(const APFloat &FPImm) {
7762 APInt Imm = FPImm.bitcastToAPInt();
7763 uint32_t Sign = Imm.lshr(31).getZExtValue() & 1;
7764 int32_t Exp = (Imm.lshr(23).getSExtValue() & 0xff) - 127; // -126 to 127
7765 int64_t Mantissa = Imm.getZExtValue() & 0x7fffff; // 23 bits
7766
7767 // We can handle 4 bits of mantissa.
7768 // mantissa = (16+UInt(e:f:g:h))/16.
7769 if (Mantissa & 0x7ffff)
7770 return -1;
7771 Mantissa >>= 19;
7772 if ((Mantissa & 0xf) != Mantissa)
7773 return -1;
7774
7775 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
7776 if (Exp < -3 || Exp > 4)
7777 return -1;
7778 Exp = ((Exp+3) & 0x7) ^ 4;
7779
7780 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
7781 }
7782
7783 int ARM::getVFPf64Imm(const APFloat &FPImm) {
7784 APInt Imm = FPImm.bitcastToAPInt();
7785 uint64_t Sign = Imm.lshr(63).getZExtValue() & 1;
7786 int64_t Exp = (Imm.lshr(52).getSExtValue() & 0x7ff) - 1023; // -1022 to 1023
7787 uint64_t Mantissa = Imm.getZExtValue() & 0xfffffffffffffLL;
7788
7789 // We can handle 4 bits of mantissa.
7790 // mantissa = (16+UInt(e:f:g:h))/16.
7791 if (Mantissa & 0xffffffffffffLL)
7792 return -1;
7793 Mantissa >>= 48;
7794 if ((Mantissa & 0xf) != Mantissa)
7795 return -1;
7796
7797 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
7798 if (Exp < -3 || Exp > 4)
7799 return -1;
7800 Exp = ((Exp+3) & 0x7) ^ 4;
7801
7802 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
7803 }
7804
7805 bool ARM::isBitFieldInvertedMask(unsigned v) {
7806 if (v == 0xffffffff)
7807 return 0;
7808 // there can be 1's on either or both "outsides", all the "inside"
7809 // bits must be 0's
7810 unsigned int lsb = 0, msb = 31;
7811 while (v & (1 << msb)) --msb;
7812 while (v & (1 << lsb)) ++lsb;
7813 for (unsigned int i = lsb; i <= msb; ++i) {
7814 if (v & (1 << i))
7815 return 0;
7816 }
7817 return 1;
7818 }
7819
7820 /// isFPImmLegal - Returns true if the target can instruction select the
7821 /// specified FP immediate natively. If false, the legalizer will
7822 /// materialize the FP immediate as a load from a constant pool.
7823 bool ARMTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
7824 if (!Subtarget->hasVFP3())
7825 return false;
7826 if (VT == MVT::f32)
7827 return ARM::getVFPf32Imm(Imm) != -1;
7828 if (VT == MVT::f64)
7829 return ARM::getVFPf64Imm(Imm) != -1;
7830 return false;
7831 }
7832
7833 /// getTgtMemIntrinsic - Represent NEON load and store intrinsics as
7834 /// MemIntrinsicNodes. The associated MachineMemOperands record the alignment
7835 /// specified in the intrinsic calls.
7836 bool ARMTargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
7837 const CallInst &I,
7838 unsigned Intrinsic) const {
7839 switch (Intrinsic) {
7840 case Intrinsic::arm_neon_vld1:
7841 case Intrinsic::arm_neon_vld2:
7842 case Intrinsic::arm_neon_vld3:
7843 case Intrinsic::arm_neon_vld4:
7844 case Intrinsic::arm_neon_vld2lane:
7845 case Intrinsic::arm_neon_vld3lane:
7846 case Intrinsic::arm_neon_vld4lane: {
7847 Info.opc = ISD::INTRINSIC_W_CHAIN;
7848 // Conservatively set memVT to the entire set of vectors loaded.
7849 uint64_t NumElts = getTargetData()->getTypeAllocSize(I.getType()) / 8;
7850 Info.memVT = EVT::getVectorVT(I.getType()->getContext(), MVT::i64, NumElts);
7851 Info.ptrVal = I.getArgOperand(0);
7852 Info.offset = 0;
7853 Value *AlignArg = I.getArgOperand(I.getNumArgOperands() - 1);
7854 Info.align = cast<ConstantInt>(AlignArg)->getZExtValue();
7855 Info.vol = false; // volatile loads with NEON intrinsics not supported
7856 Info.readMem = true;
7857 Info.writeMem = false;
7858 return true;
7859 }
7860 case Intrinsic::arm_neon_vst1:
7861 case Intrinsic::arm_neon_vst2:
7862 case Intrinsic::arm_neon_vst3:
7863 case Intrinsic::arm_neon_vst4:
7864 case Intrinsic::arm_neon_vst2lane:
7865 case Intrinsic::arm_neon_vst3lane:
7866 case Intrinsic::arm_neon_vst4lane: {
7867 Info.opc = ISD::INTRINSIC_VOID;
7868 // Conservatively set memVT to the entire set of vectors stored.
7869 unsigned NumElts = 0;
7870 for (unsigned ArgI = 1, ArgE = I.getNumArgOperands(); ArgI < ArgE; ++ArgI) {
7871 const Type *ArgTy = I.getArgOperand(ArgI)->getType();
7872 if (!ArgTy->isVectorTy())
7873 break;
7874 NumElts += getTargetData()->getTypeAllocSize(ArgTy) / 8;
7875 }
7876 Info.memVT = EVT::getVectorVT(I.getType()->getContext(), MVT::i64, NumElts);
7877 Info.ptrVal = I.getArgOperand(0);
7878 Info.offset = 0;
7879 Value *AlignArg = I.getArgOperand(I.getNumArgOperands() - 1);
7880 Info.align = cast<ConstantInt>(AlignArg)->getZExtValue();
7881 Info.vol = false; // volatile stores with NEON intrinsics not supported
7882 Info.readMem = false;
7883 Info.writeMem = true;
7884 return true;
7885 }
7886 case Intrinsic::arm_strexd: {
7887 Info.opc = ISD::INTRINSIC_W_CHAIN;
7888 Info.memVT = MVT::i64;
7889 Info.ptrVal = I.getArgOperand(2);
7890 Info.offset = 0;
7891 Info.align = 8;
7892 Info.vol = true;
7893 Info.readMem = false;
7894 Info.writeMem = true;
7895 return true;
7896 }
7897 case Intrinsic::arm_ldrexd: {
7898 Info.opc = ISD::INTRINSIC_W_CHAIN;
7899 Info.memVT = MVT::i64;
7900 Info.ptrVal = I.getArgOperand(0);
7901 Info.offset = 0;
7902 Info.align = 8;
7903 Info.vol = true;
7904 Info.readMem = true;
7905 Info.writeMem = false;
7906 return true;
7907 }
7908 default:
7909 break;
7910 }
7911
7912 return false;
7913 }
STM8 backend for LLVM