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[InstCombine] Signed saturation patterns
[llvm-complete.git] / lib / Target / Mips / Mips16ISelLowering.cpp
blob5a5b78c9d5f97e2a19f0859ac573750544ad2ca0
1 //===-- Mips16ISelLowering.h - Mips16 DAG Lowering Interface ----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Subclass of MipsTargetLowering specialized for mips16.
10 //
11 //===----------------------------------------------------------------------===//
12 #include "Mips16ISelLowering.h"
13 #include "MCTargetDesc/MipsBaseInfo.h"
14 #include "Mips16HardFloatInfo.h"
15 #include "MipsMachineFunction.h"
16 #include "MipsRegisterInfo.h"
17 #include "MipsTargetMachine.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/CodeGen/TargetInstrInfo.h"
20 #include "llvm/Support/CommandLine.h"
21
22 using namespace llvm;
23
24 #define DEBUG_TYPE "mips-lower"
25
26 static cl::opt<bool> DontExpandCondPseudos16(
27 "mips16-dont-expand-cond-pseudo",
28 cl::init(false),
29 cl::desc("Don't expand conditional move related "
30 "pseudos for Mips 16"),
31 cl::Hidden);
32
33 namespace {
34 struct Mips16Libcall {
35 RTLIB::Libcall Libcall;
36 const char *Name;
37
38 bool operator<(const Mips16Libcall &RHS) const {
39 return std::strcmp(Name, RHS.Name) < 0;
40 }
41 };
42
43 struct Mips16IntrinsicHelperType{
44 const char* Name;
45 const char* Helper;
46
47 bool operator<(const Mips16IntrinsicHelperType &RHS) const {
48 return std::strcmp(Name, RHS.Name) < 0;
49 }
50 bool operator==(const Mips16IntrinsicHelperType &RHS) const {
51 return std::strcmp(Name, RHS.Name) == 0;
52 }
53 };
54 }
55
56 // Libcalls for which no helper is generated. Sorted by name for binary search.
57 static const Mips16Libcall HardFloatLibCalls[] = {
58 { RTLIB::ADD_F64, "__mips16_adddf3" },
59 { RTLIB::ADD_F32, "__mips16_addsf3" },
60 { RTLIB::DIV_F64, "__mips16_divdf3" },
61 { RTLIB::DIV_F32, "__mips16_divsf3" },
62 { RTLIB::OEQ_F64, "__mips16_eqdf2" },
63 { RTLIB::OEQ_F32, "__mips16_eqsf2" },
64 { RTLIB::FPEXT_F32_F64, "__mips16_extendsfdf2" },
65 { RTLIB::FPTOSINT_F64_I32, "__mips16_fix_truncdfsi" },
66 { RTLIB::FPTOSINT_F32_I32, "__mips16_fix_truncsfsi" },
67 { RTLIB::SINTTOFP_I32_F64, "__mips16_floatsidf" },
68 { RTLIB::SINTTOFP_I32_F32, "__mips16_floatsisf" },
69 { RTLIB::UINTTOFP_I32_F64, "__mips16_floatunsidf" },
70 { RTLIB::UINTTOFP_I32_F32, "__mips16_floatunsisf" },
71 { RTLIB::OGE_F64, "__mips16_gedf2" },
72 { RTLIB::OGE_F32, "__mips16_gesf2" },
73 { RTLIB::OGT_F64, "__mips16_gtdf2" },
74 { RTLIB::OGT_F32, "__mips16_gtsf2" },
75 { RTLIB::OLE_F64, "__mips16_ledf2" },
76 { RTLIB::OLE_F32, "__mips16_lesf2" },
77 { RTLIB::OLT_F64, "__mips16_ltdf2" },
78 { RTLIB::OLT_F32, "__mips16_ltsf2" },
79 { RTLIB::MUL_F64, "__mips16_muldf3" },
80 { RTLIB::MUL_F32, "__mips16_mulsf3" },
81 { RTLIB::UNE_F64, "__mips16_nedf2" },
82 { RTLIB::UNE_F32, "__mips16_nesf2" },
83 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_dc" }, // No associated libcall.
84 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_df" }, // No associated libcall.
85 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_sc" }, // No associated libcall.
86 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_sf" }, // No associated libcall.
87 { RTLIB::SUB_F64, "__mips16_subdf3" },
88 { RTLIB::SUB_F32, "__mips16_subsf3" },
89 { RTLIB::FPROUND_F64_F32, "__mips16_truncdfsf2" },
90 { RTLIB::UO_F64, "__mips16_unorddf2" },
91 { RTLIB::UO_F32, "__mips16_unordsf2" }
92 };
93
94 static const Mips16IntrinsicHelperType Mips16IntrinsicHelper[] = {
95 {"__fixunsdfsi", "__mips16_call_stub_2" },
96 {"ceil", "__mips16_call_stub_df_2"},
97 {"ceilf", "__mips16_call_stub_sf_1"},
98 {"copysign", "__mips16_call_stub_df_10"},
99 {"copysignf", "__mips16_call_stub_sf_5"},
100 {"cos", "__mips16_call_stub_df_2"},
101 {"cosf", "__mips16_call_stub_sf_1"},
102 {"exp2", "__mips16_call_stub_df_2"},
103 {"exp2f", "__mips16_call_stub_sf_1"},
104 {"floor", "__mips16_call_stub_df_2"},
105 {"floorf", "__mips16_call_stub_sf_1"},
106 {"log2", "__mips16_call_stub_df_2"},
107 {"log2f", "__mips16_call_stub_sf_1"},
108 {"nearbyint", "__mips16_call_stub_df_2"},
109 {"nearbyintf", "__mips16_call_stub_sf_1"},
110 {"rint", "__mips16_call_stub_df_2"},
111 {"rintf", "__mips16_call_stub_sf_1"},
112 {"sin", "__mips16_call_stub_df_2"},
113 {"sinf", "__mips16_call_stub_sf_1"},
114 {"sqrt", "__mips16_call_stub_df_2"},
115 {"sqrtf", "__mips16_call_stub_sf_1"},
116 {"trunc", "__mips16_call_stub_df_2"},
117 {"truncf", "__mips16_call_stub_sf_1"},
118 };
119
120 Mips16TargetLowering::Mips16TargetLowering(const MipsTargetMachine &TM,
121 const MipsSubtarget &STI)
122 : MipsTargetLowering(TM, STI) {
123
124 // Set up the register classes
125 addRegisterClass(MVT::i32, &Mips::CPU16RegsRegClass);
126
127 if (!Subtarget.useSoftFloat())
128 setMips16HardFloatLibCalls();
129
130 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand);
131 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Expand);
132 setOperationAction(ISD::ATOMIC_SWAP, MVT::i32, Expand);
133 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i32, Expand);
134 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i32, Expand);
135 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i32, Expand);
136 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i32, Expand);
137 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i32, Expand);
138 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand);
139 setOperationAction(ISD::ATOMIC_LOAD_MIN, MVT::i32, Expand);
140 setOperationAction(ISD::ATOMIC_LOAD_MAX, MVT::i32, Expand);
141 setOperationAction(ISD::ATOMIC_LOAD_UMIN, MVT::i32, Expand);
142 setOperationAction(ISD::ATOMIC_LOAD_UMAX, MVT::i32, Expand);
143
144 setOperationAction(ISD::ROTR, MVT::i32, Expand);
145 setOperationAction(ISD::ROTR, MVT::i64, Expand);
146 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
147 setOperationAction(ISD::BSWAP, MVT::i64, Expand);
148
149 computeRegisterProperties(STI.getRegisterInfo());
150 }
151
152 const MipsTargetLowering *
153 llvm::createMips16TargetLowering(const MipsTargetMachine &TM,
154 const MipsSubtarget &STI) {
155 return new Mips16TargetLowering(TM, STI);
156 }
157
158 bool Mips16TargetLowering::allowsMisalignedMemoryAccesses(
159 EVT VT, unsigned, unsigned, MachineMemOperand::Flags, bool *Fast) const {
160 return false;
161 }
162
163 MachineBasicBlock *
164 Mips16TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
165 MachineBasicBlock *BB) const {
166 switch (MI.getOpcode()) {
167 default:
168 return MipsTargetLowering::EmitInstrWithCustomInserter(MI, BB);
169 case Mips::SelBeqZ:
170 return emitSel16(Mips::BeqzRxImm16, MI, BB);
171 case Mips::SelBneZ:
172 return emitSel16(Mips::BnezRxImm16, MI, BB);
173 case Mips::SelTBteqZCmpi:
174 return emitSeliT16(Mips::Bteqz16, Mips::CmpiRxImmX16, MI, BB);
175 case Mips::SelTBteqZSlti:
176 return emitSeliT16(Mips::Bteqz16, Mips::SltiRxImmX16, MI, BB);
177 case Mips::SelTBteqZSltiu:
178 return emitSeliT16(Mips::Bteqz16, Mips::SltiuRxImmX16, MI, BB);
179 case Mips::SelTBtneZCmpi:
180 return emitSeliT16(Mips::Btnez16, Mips::CmpiRxImmX16, MI, BB);
181 case Mips::SelTBtneZSlti:
182 return emitSeliT16(Mips::Btnez16, Mips::SltiRxImmX16, MI, BB);
183 case Mips::SelTBtneZSltiu:
184 return emitSeliT16(Mips::Btnez16, Mips::SltiuRxImmX16, MI, BB);
185 case Mips::SelTBteqZCmp:
186 return emitSelT16(Mips::Bteqz16, Mips::CmpRxRy16, MI, BB);
187 case Mips::SelTBteqZSlt:
188 return emitSelT16(Mips::Bteqz16, Mips::SltRxRy16, MI, BB);
189 case Mips::SelTBteqZSltu:
190 return emitSelT16(Mips::Bteqz16, Mips::SltuRxRy16, MI, BB);
191 case Mips::SelTBtneZCmp:
192 return emitSelT16(Mips::Btnez16, Mips::CmpRxRy16, MI, BB);
193 case Mips::SelTBtneZSlt:
194 return emitSelT16(Mips::Btnez16, Mips::SltRxRy16, MI, BB);
195 case Mips::SelTBtneZSltu:
196 return emitSelT16(Mips::Btnez16, Mips::SltuRxRy16, MI, BB);
197 case Mips::BteqzT8CmpX16:
198 return emitFEXT_T8I816_ins(Mips::Bteqz16, Mips::CmpRxRy16, MI, BB);
199 case Mips::BteqzT8SltX16:
200 return emitFEXT_T8I816_ins(Mips::Bteqz16, Mips::SltRxRy16, MI, BB);
201 case Mips::BteqzT8SltuX16:
202 // TBD: figure out a way to get this or remove the instruction
203 // altogether.
204 return emitFEXT_T8I816_ins(Mips::Bteqz16, Mips::SltuRxRy16, MI, BB);
205 case Mips::BtnezT8CmpX16:
206 return emitFEXT_T8I816_ins(Mips::Btnez16, Mips::CmpRxRy16, MI, BB);
207 case Mips::BtnezT8SltX16:
208 return emitFEXT_T8I816_ins(Mips::Btnez16, Mips::SltRxRy16, MI, BB);
209 case Mips::BtnezT8SltuX16:
210 // TBD: figure out a way to get this or remove the instruction
211 // altogether.
212 return emitFEXT_T8I816_ins(Mips::Btnez16, Mips::SltuRxRy16, MI, BB);
213 case Mips::BteqzT8CmpiX16: return emitFEXT_T8I8I16_ins(
214 Mips::Bteqz16, Mips::CmpiRxImm16, Mips::CmpiRxImmX16, false, MI, BB);
215 case Mips::BteqzT8SltiX16: return emitFEXT_T8I8I16_ins(
216 Mips::Bteqz16, Mips::SltiRxImm16, Mips::SltiRxImmX16, true, MI, BB);
217 case Mips::BteqzT8SltiuX16: return emitFEXT_T8I8I16_ins(
218 Mips::Bteqz16, Mips::SltiuRxImm16, Mips::SltiuRxImmX16, false, MI, BB);
219 case Mips::BtnezT8CmpiX16: return emitFEXT_T8I8I16_ins(
220 Mips::Btnez16, Mips::CmpiRxImm16, Mips::CmpiRxImmX16, false, MI, BB);
221 case Mips::BtnezT8SltiX16: return emitFEXT_T8I8I16_ins(
222 Mips::Btnez16, Mips::SltiRxImm16, Mips::SltiRxImmX16, true, MI, BB);
223 case Mips::BtnezT8SltiuX16: return emitFEXT_T8I8I16_ins(
224 Mips::Btnez16, Mips::SltiuRxImm16, Mips::SltiuRxImmX16, false, MI, BB);
225 break;
226 case Mips::SltCCRxRy16:
227 return emitFEXT_CCRX16_ins(Mips::SltRxRy16, MI, BB);
228 break;
229 case Mips::SltiCCRxImmX16:
230 return emitFEXT_CCRXI16_ins
231 (Mips::SltiRxImm16, Mips::SltiRxImmX16, MI, BB);
232 case Mips::SltiuCCRxImmX16:
233 return emitFEXT_CCRXI16_ins
234 (Mips::SltiuRxImm16, Mips::SltiuRxImmX16, MI, BB);
235 case Mips::SltuCCRxRy16:
236 return emitFEXT_CCRX16_ins
237 (Mips::SltuRxRy16, MI, BB);
238 }
239 }
240
241 bool Mips16TargetLowering::isEligibleForTailCallOptimization(
242 const CCState &CCInfo, unsigned NextStackOffset,
243 const MipsFunctionInfo &FI) const {
244 // No tail call optimization for mips16.
245 return false;
246 }
247
248 void Mips16TargetLowering::setMips16HardFloatLibCalls() {
249 for (unsigned I = 0; I != array_lengthof(HardFloatLibCalls); ++I) {
250 assert((I == 0 || HardFloatLibCalls[I - 1] < HardFloatLibCalls[I]) &&
251 "Array not sorted!");
252 if (HardFloatLibCalls[I].Libcall != RTLIB::UNKNOWN_LIBCALL)
253 setLibcallName(HardFloatLibCalls[I].Libcall, HardFloatLibCalls[I].Name);
254 }
255
256 setLibcallName(RTLIB::O_F64, "__mips16_unorddf2");
257 setLibcallName(RTLIB::O_F32, "__mips16_unordsf2");
258 }
259
260 //
261 // The Mips16 hard float is a crazy quilt inherited from gcc. I have a much
262 // cleaner way to do all of this but it will have to wait until the traditional
263 // gcc mechanism is completed.
264 //
265 // For Pic, in order for Mips16 code to call Mips32 code which according the abi
266 // have either arguments or returned values placed in floating point registers,
267 // we use a set of helper functions. (This includes functions which return type
268 // complex which on Mips are returned in a pair of floating point registers).
269 //
270 // This is an encoding that we inherited from gcc.
271 // In Mips traditional O32, N32 ABI, floating point numbers are passed in
272 // floating point argument registers 1,2 only when the first and optionally
273 // the second arguments are float (sf) or double (df).
274 // For Mips16 we are only concerned with the situations where floating point
275 // arguments are being passed in floating point registers by the ABI, because
276 // Mips16 mode code cannot execute floating point instructions to load those
277 // values and hence helper functions are needed.
278 // The possibilities are (), (sf), (sf, sf), (sf, df), (df), (df, sf), (df, df)
279 // the helper function suffixs for these are:
280 // 0, 1, 5, 9, 2, 6, 10
281 // this suffix can then be calculated as follows:
282 // for a given argument Arg:
283 // Arg1x, Arg2x = 1 : Arg is sf
284 // 2 : Arg is df
285 // 0: Arg is neither sf or df
286 // So this stub is the string for number Arg1x + Arg2x*4.
287 // However not all numbers between 0 and 10 are possible, we check anyway and
288 // assert if the impossible exists.
289 //
290
291 unsigned int Mips16TargetLowering::getMips16HelperFunctionStubNumber
292 (ArgListTy &Args) const {
293 unsigned int resultNum = 0;
294 if (Args.size() >= 1) {
295 Type *t = Args[0].Ty;
296 if (t->isFloatTy()) {
297 resultNum = 1;
298 }
299 else if (t->isDoubleTy()) {
300 resultNum = 2;
301 }
302 }
303 if (resultNum) {
304 if (Args.size() >=2) {
305 Type *t = Args[1].Ty;
306 if (t->isFloatTy()) {
307 resultNum += 4;
308 }
309 else if (t->isDoubleTy()) {
310 resultNum += 8;
311 }
312 }
313 }
314 return resultNum;
315 }
316
317 //
318 // Prefixes are attached to stub numbers depending on the return type.
319 // return type: float sf_
320 // double df_
321 // single complex sc_
322 // double complext dc_
323 // others NO PREFIX
324 //
325 //
326 // The full name of a helper function is__mips16_call_stub +
327 // return type dependent prefix + stub number
328 //
329 // FIXME: This is something that probably should be in a different source file
330 // and perhaps done differently but my main purpose is to not waste runtime
331 // on something that we can enumerate in the source. Another possibility is
332 // to have a python script to generate these mapping tables. This will do
333 // for now. There are a whole series of helper function mapping arrays, one
334 // for each return type class as outlined above. There there are 11 possible
335 // entries. Ones with 0 are ones which should never be selected.
336 //
337 // All the arrays are similar except for ones which return neither
338 // sf, df, sc, dc, in which we only care about ones which have sf or df as a
339 // first parameter.
340 //
341 #define P_ "__mips16_call_stub_"
342 #define MAX_STUB_NUMBER 10
343 #define T1 P "1", P "2", 0, 0, P "5", P "6", 0, 0, P "9", P "10"
344 #define T P "0" , T1
345 #define P P_
346 static char const * vMips16Helper[MAX_STUB_NUMBER+1] =
347 {nullptr, T1 };
348 #undef P
349 #define P P_ "sf_"
350 static char const * sfMips16Helper[MAX_STUB_NUMBER+1] =
351 { T };
352 #undef P
353 #define P P_ "df_"
354 static char const * dfMips16Helper[MAX_STUB_NUMBER+1] =
355 { T };
356 #undef P
357 #define P P_ "sc_"
358 static char const * scMips16Helper[MAX_STUB_NUMBER+1] =
359 { T };
360 #undef P
361 #define P P_ "dc_"
362 static char const * dcMips16Helper[MAX_STUB_NUMBER+1] =
363 { T };
364 #undef P
365 #undef P_
366
367
368 const char* Mips16TargetLowering::
369 getMips16HelperFunction
370 (Type* RetTy, ArgListTy &Args, bool &needHelper) const {
371 const unsigned int stubNum = getMips16HelperFunctionStubNumber(Args);
372 #ifndef NDEBUG
373 const unsigned int maxStubNum = 10;
374 assert(stubNum <= maxStubNum);
375 const bool validStubNum[maxStubNum+1] =
376 {true, true, true, false, false, true, true, false, false, true, true};
377 assert(validStubNum[stubNum]);
378 #endif
379 const char *result;
380 if (RetTy->isFloatTy()) {
381 result = sfMips16Helper[stubNum];
382 }
383 else if (RetTy ->isDoubleTy()) {
384 result = dfMips16Helper[stubNum];
385 } else if (StructType *SRetTy = dyn_cast<StructType>(RetTy)) {
386 // check if it's complex
387 if (SRetTy->getNumElements() == 2) {
388 if ((SRetTy->getElementType(0)->isFloatTy()) &&
389 (SRetTy->getElementType(1)->isFloatTy())) {
390 result = scMips16Helper[stubNum];
391 } else if ((SRetTy->getElementType(0)->isDoubleTy()) &&
392 (SRetTy->getElementType(1)->isDoubleTy())) {
393 result = dcMips16Helper[stubNum];
394 } else {
395 llvm_unreachable("Uncovered condition");
396 }
397 } else {
398 llvm_unreachable("Uncovered condition");
399 }
400 } else {
401 if (stubNum == 0) {
402 needHelper = false;
403 return "";
404 }
405 result = vMips16Helper[stubNum];
406 }
407 needHelper = true;
408 return result;
409 }
410
411 void Mips16TargetLowering::
412 getOpndList(SmallVectorImpl<SDValue> &Ops,
413 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
414 bool IsPICCall, bool GlobalOrExternal, bool InternalLinkage,
415 bool IsCallReloc, CallLoweringInfo &CLI, SDValue Callee,
416 SDValue Chain) const {
417 SelectionDAG &DAG = CLI.DAG;
418 MachineFunction &MF = DAG.getMachineFunction();
419 MipsFunctionInfo *FuncInfo = MF.getInfo<MipsFunctionInfo>();
420 const char* Mips16HelperFunction = nullptr;
421 bool NeedMips16Helper = false;
422
423 if (Subtarget.inMips16HardFloat()) {
424 //
425 // currently we don't have symbols tagged with the mips16 or mips32
426 // qualifier so we will assume that we don't know what kind it is.
427 // and generate the helper
428 //
429 bool LookupHelper = true;
430 if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(CLI.Callee)) {
431 Mips16Libcall Find = { RTLIB::UNKNOWN_LIBCALL, S->getSymbol() };
432
433 if (std::binary_search(std::begin(HardFloatLibCalls),
434 std::end(HardFloatLibCalls), Find))
435 LookupHelper = false;
436 else {
437 const char *Symbol = S->getSymbol();
438 Mips16IntrinsicHelperType IntrinsicFind = { Symbol, "" };
439 const Mips16HardFloatInfo::FuncSignature *Signature =
440 Mips16HardFloatInfo::findFuncSignature(Symbol);
441 if (!IsPICCall && (Signature && (FuncInfo->StubsNeeded.find(Symbol) ==
442 FuncInfo->StubsNeeded.end()))) {
443 FuncInfo->StubsNeeded[Symbol] = Signature;
444 //
445 // S2 is normally saved if the stub is for a function which
446 // returns a float or double value and is not otherwise. This is
447 // because more work is required after the function the stub
448 // is calling completes, and so the stub cannot directly return
449 // and the stub has no stack space to store the return address so
450 // S2 is used for that purpose.
451 // In order to take advantage of not saving S2, we need to also
452 // optimize the call in the stub and this requires some further
453 // functionality in MipsAsmPrinter which we don't have yet.
454 // So for now we always save S2. The optimization will be done
455 // in a follow-on patch.
456 //
457 if (1 || (Signature->RetSig != Mips16HardFloatInfo::NoFPRet))
458 FuncInfo->setSaveS2();
459 }
460 // one more look at list of intrinsics
461 const Mips16IntrinsicHelperType *Helper =
462 llvm::lower_bound(Mips16IntrinsicHelper, IntrinsicFind);
463 if (Helper != std::end(Mips16IntrinsicHelper) &&
464 *Helper == IntrinsicFind) {
465 Mips16HelperFunction = Helper->Helper;
466 NeedMips16Helper = true;
467 LookupHelper = false;
468 }
469
470 }
471 } else if (GlobalAddressSDNode *G =
472 dyn_cast<GlobalAddressSDNode>(CLI.Callee)) {
473 Mips16Libcall Find = { RTLIB::UNKNOWN_LIBCALL,
474 G->getGlobal()->getName().data() };
475
476 if (std::binary_search(std::begin(HardFloatLibCalls),
477 std::end(HardFloatLibCalls), Find))
478 LookupHelper = false;
479 }
480 if (LookupHelper)
481 Mips16HelperFunction =
482 getMips16HelperFunction(CLI.RetTy, CLI.getArgs(), NeedMips16Helper);
483 }
484
485 SDValue JumpTarget = Callee;
486
487 // T9 should contain the address of the callee function if
488 // -relocation-model=pic or it is an indirect call.
489 if (IsPICCall || !GlobalOrExternal) {
490 unsigned V0Reg = Mips::V0;
491 if (NeedMips16Helper) {
492 RegsToPass.push_front(std::make_pair(V0Reg, Callee));
493 JumpTarget = DAG.getExternalSymbol(Mips16HelperFunction,
494 getPointerTy(DAG.getDataLayout()));
495 ExternalSymbolSDNode *S = cast<ExternalSymbolSDNode>(JumpTarget);
496 JumpTarget = getAddrGlobal(S, CLI.DL, JumpTarget.getValueType(), DAG,
497 MipsII::MO_GOT, Chain,
498 FuncInfo->callPtrInfo(S->getSymbol()));
499 } else
500 RegsToPass.push_front(std::make_pair((unsigned)Mips::T9, Callee));
501 }
502
503 Ops.push_back(JumpTarget);
504
505 MipsTargetLowering::getOpndList(Ops, RegsToPass, IsPICCall, GlobalOrExternal,
506 InternalLinkage, IsCallReloc, CLI, Callee,
507 Chain);
508 }
509
510 MachineBasicBlock *
511 Mips16TargetLowering::emitSel16(unsigned Opc, MachineInstr &MI,
512 MachineBasicBlock *BB) const {
513 if (DontExpandCondPseudos16)
514 return BB;
515 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
516 DebugLoc DL = MI.getDebugLoc();
517 // To "insert" a SELECT_CC instruction, we actually have to insert the
518 // diamond control-flow pattern. The incoming instruction knows the
519 // destination vreg to set, the condition code register to branch on, the
520 // true/false values to select between, and a branch opcode to use.
521 const BasicBlock *LLVM_BB = BB->getBasicBlock();
522 MachineFunction::iterator It = ++BB->getIterator();
523
524 // thisMBB:
525 // ...
526 // TrueVal = ...
527 // setcc r1, r2, r3
528 // bNE r1, r0, copy1MBB
529 // fallthrough --> copy0MBB
530 MachineBasicBlock *thisMBB = BB;
531 MachineFunction *F = BB->getParent();
532 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
533 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
534 F->insert(It, copy0MBB);
535 F->insert(It, sinkMBB);
536
537 // Transfer the remainder of BB and its successor edges to sinkMBB.
538 sinkMBB->splice(sinkMBB->begin(), BB,
539 std::next(MachineBasicBlock::iterator(MI)), BB->end());
540 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
541
542 // Next, add the true and fallthrough blocks as its successors.
543 BB->addSuccessor(copy0MBB);
544 BB->addSuccessor(sinkMBB);
545
546 BuildMI(BB, DL, TII->get(Opc))
547 .addReg(MI.getOperand(3).getReg())
548 .addMBB(sinkMBB);
549
550 // copy0MBB:
551 // %FalseValue = ...
552 // # fallthrough to sinkMBB
553 BB = copy0MBB;
554
555 // Update machine-CFG edges
556 BB->addSuccessor(sinkMBB);
557
558 // sinkMBB:
559 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
560 // ...
561 BB = sinkMBB;
562
563 BuildMI(*BB, BB->begin(), DL, TII->get(Mips::PHI), MI.getOperand(0).getReg())
564 .addReg(MI.getOperand(1).getReg())
565 .addMBB(thisMBB)
566 .addReg(MI.getOperand(2).getReg())
567 .addMBB(copy0MBB);
568
569 MI.eraseFromParent(); // The pseudo instruction is gone now.
570 return BB;
571 }
572
573 MachineBasicBlock *
574 Mips16TargetLowering::emitSelT16(unsigned Opc1, unsigned Opc2, MachineInstr &MI,
575 MachineBasicBlock *BB) const {
576 if (DontExpandCondPseudos16)
577 return BB;
578 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
579 DebugLoc DL = MI.getDebugLoc();
580 // To "insert" a SELECT_CC instruction, we actually have to insert the
581 // diamond control-flow pattern. The incoming instruction knows the
582 // destination vreg to set, the condition code register to branch on, the
583 // true/false values to select between, and a branch opcode to use.
584 const BasicBlock *LLVM_BB = BB->getBasicBlock();
585 MachineFunction::iterator It = ++BB->getIterator();
586
587 // thisMBB:
588 // ...
589 // TrueVal = ...
590 // setcc r1, r2, r3
591 // bNE r1, r0, copy1MBB
592 // fallthrough --> copy0MBB
593 MachineBasicBlock *thisMBB = BB;
594 MachineFunction *F = BB->getParent();
595 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
596 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
597 F->insert(It, copy0MBB);
598 F->insert(It, sinkMBB);
599
600 // Transfer the remainder of BB and its successor edges to sinkMBB.
601 sinkMBB->splice(sinkMBB->begin(), BB,
602 std::next(MachineBasicBlock::iterator(MI)), BB->end());
603 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
604
605 // Next, add the true and fallthrough blocks as its successors.
606 BB->addSuccessor(copy0MBB);
607 BB->addSuccessor(sinkMBB);
608
609 BuildMI(BB, DL, TII->get(Opc2))
610 .addReg(MI.getOperand(3).getReg())
611 .addReg(MI.getOperand(4).getReg());
612 BuildMI(BB, DL, TII->get(Opc1)).addMBB(sinkMBB);
613
614 // copy0MBB:
615 // %FalseValue = ...
616 // # fallthrough to sinkMBB
617 BB = copy0MBB;
618
619 // Update machine-CFG edges
620 BB->addSuccessor(sinkMBB);
621
622 // sinkMBB:
623 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
624 // ...
625 BB = sinkMBB;
626
627 BuildMI(*BB, BB->begin(), DL, TII->get(Mips::PHI), MI.getOperand(0).getReg())
628 .addReg(MI.getOperand(1).getReg())
629 .addMBB(thisMBB)
630 .addReg(MI.getOperand(2).getReg())
631 .addMBB(copy0MBB);
632
633 MI.eraseFromParent(); // The pseudo instruction is gone now.
634 return BB;
635
636 }
637
638 MachineBasicBlock *
639 Mips16TargetLowering::emitSeliT16(unsigned Opc1, unsigned Opc2,
640 MachineInstr &MI,
641 MachineBasicBlock *BB) const {
642 if (DontExpandCondPseudos16)
643 return BB;
644 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
645 DebugLoc DL = MI.getDebugLoc();
646 // To "insert" a SELECT_CC instruction, we actually have to insert the
647 // diamond control-flow pattern. The incoming instruction knows the
648 // destination vreg to set, the condition code register to branch on, the
649 // true/false values to select between, and a branch opcode to use.
650 const BasicBlock *LLVM_BB = BB->getBasicBlock();
651 MachineFunction::iterator It = ++BB->getIterator();
652
653 // thisMBB:
654 // ...
655 // TrueVal = ...
656 // setcc r1, r2, r3
657 // bNE r1, r0, copy1MBB
658 // fallthrough --> copy0MBB
659 MachineBasicBlock *thisMBB = BB;
660 MachineFunction *F = BB->getParent();
661 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
662 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
663 F->insert(It, copy0MBB);
664 F->insert(It, sinkMBB);
665
666 // Transfer the remainder of BB and its successor edges to sinkMBB.
667 sinkMBB->splice(sinkMBB->begin(), BB,
668 std::next(MachineBasicBlock::iterator(MI)), BB->end());
669 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
670
671 // Next, add the true and fallthrough blocks as its successors.
672 BB->addSuccessor(copy0MBB);
673 BB->addSuccessor(sinkMBB);
674
675 BuildMI(BB, DL, TII->get(Opc2))
676 .addReg(MI.getOperand(3).getReg())
677 .addImm(MI.getOperand(4).getImm());
678 BuildMI(BB, DL, TII->get(Opc1)).addMBB(sinkMBB);
679
680 // copy0MBB:
681 // %FalseValue = ...
682 // # fallthrough to sinkMBB
683 BB = copy0MBB;
684
685 // Update machine-CFG edges
686 BB->addSuccessor(sinkMBB);
687
688 // sinkMBB:
689 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
690 // ...
691 BB = sinkMBB;
692
693 BuildMI(*BB, BB->begin(), DL, TII->get(Mips::PHI), MI.getOperand(0).getReg())
694 .addReg(MI.getOperand(1).getReg())
695 .addMBB(thisMBB)
696 .addReg(MI.getOperand(2).getReg())
697 .addMBB(copy0MBB);
698
699 MI.eraseFromParent(); // The pseudo instruction is gone now.
700 return BB;
701
702 }
703
704 MachineBasicBlock *
705 Mips16TargetLowering::emitFEXT_T8I816_ins(unsigned BtOpc, unsigned CmpOpc,
706 MachineInstr &MI,
707 MachineBasicBlock *BB) const {
708 if (DontExpandCondPseudos16)
709 return BB;
710 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
711 Register regX = MI.getOperand(0).getReg();
712 Register regY = MI.getOperand(1).getReg();
713 MachineBasicBlock *target = MI.getOperand(2).getMBB();
714 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(CmpOpc))
715 .addReg(regX)
716 .addReg(regY);
717 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(BtOpc)).addMBB(target);
718 MI.eraseFromParent(); // The pseudo instruction is gone now.
719 return BB;
720 }
721
722 MachineBasicBlock *Mips16TargetLowering::emitFEXT_T8I8I16_ins(
723 unsigned BtOpc, unsigned CmpiOpc, unsigned CmpiXOpc, bool ImmSigned,
724 MachineInstr &MI, MachineBasicBlock *BB) const {
725 if (DontExpandCondPseudos16)
726 return BB;
727 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
728 Register regX = MI.getOperand(0).getReg();
729 int64_t imm = MI.getOperand(1).getImm();
730 MachineBasicBlock *target = MI.getOperand(2).getMBB();
731 unsigned CmpOpc;
732 if (isUInt<8>(imm))
733 CmpOpc = CmpiOpc;
734 else if ((!ImmSigned && isUInt<16>(imm)) ||
735 (ImmSigned && isInt<16>(imm)))
736 CmpOpc = CmpiXOpc;
737 else
738 llvm_unreachable("immediate field not usable");
739 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(CmpOpc)).addReg(regX).addImm(imm);
740 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(BtOpc)).addMBB(target);
741 MI.eraseFromParent(); // The pseudo instruction is gone now.
742 return BB;
743 }
744
745 static unsigned Mips16WhichOp8uOr16simm
746 (unsigned shortOp, unsigned longOp, int64_t Imm) {
747 if (isUInt<8>(Imm))
748 return shortOp;
749 else if (isInt<16>(Imm))
750 return longOp;
751 else
752 llvm_unreachable("immediate field not usable");
753 }
754
755 MachineBasicBlock *
756 Mips16TargetLowering::emitFEXT_CCRX16_ins(unsigned SltOpc, MachineInstr &MI,
757 MachineBasicBlock *BB) const {
758 if (DontExpandCondPseudos16)
759 return BB;
760 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
761 Register CC = MI.getOperand(0).getReg();
762 Register regX = MI.getOperand(1).getReg();
763 Register regY = MI.getOperand(2).getReg();
764 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(SltOpc))
765 .addReg(regX)
766 .addReg(regY);
767 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(Mips::MoveR3216), CC)
768 .addReg(Mips::T8);
769 MI.eraseFromParent(); // The pseudo instruction is gone now.
770 return BB;
771 }
772
773 MachineBasicBlock *
774 Mips16TargetLowering::emitFEXT_CCRXI16_ins(unsigned SltiOpc, unsigned SltiXOpc,
775 MachineInstr &MI,
776 MachineBasicBlock *BB) const {
777 if (DontExpandCondPseudos16)
778 return BB;
779 const TargetInstrInfo *TII = Subtarget.getInstrInfo();
780 Register CC = MI.getOperand(0).getReg();
781 Register regX = MI.getOperand(1).getReg();
782 int64_t Imm = MI.getOperand(2).getImm();
783 unsigned SltOpc = Mips16WhichOp8uOr16simm(SltiOpc, SltiXOpc, Imm);
784 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(SltOpc)).addReg(regX).addImm(Imm);
785 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(Mips::MoveR3216), CC)
786 .addReg(Mips::T8);
787 MI.eraseFromParent(); // The pseudo instruction is gone now.
788 return BB;
789
790 }
The low level virtual machine