1 //===- X86RegisterInfo.td - Describe the X86 Register File --*- tablegen -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file describes the X86 Register file, defining the registers themselves,
11 // aliases between the registers, and the register classes built out of the
14 //===----------------------------------------------------------------------===//
16 //===----------------------------------------------------------------------===//
17 // Register definitions...
19 let Namespace = "X86" in {
21 // In the register alias definitions below, we define which registers alias
22 // which others. We only specify which registers the small registers alias,
23 // because the register file generator is smart enough to figure out that
24 // AL aliases AX if we tell it that AX aliased AL (for example).
26 // Dwarf numbering is different for 32-bit and 64-bit, and there are
27 // variations by target as well. Currently the first entry is for X86-64,
28 // second - for EH on X86-32/Darwin and third is 'generic' one (X86-32/Linux
29 // and debug information on X86-32/Darwin)
33 def AL : Register<"al">, DwarfRegNum<[0, 0, 0]>;
34 def DL : Register<"dl">, DwarfRegNum<[1, 2, 2]>;
35 def CL : Register<"cl">, DwarfRegNum<[2, 1, 1]>;
36 def BL : Register<"bl">, DwarfRegNum<[3, 3, 3]>;
39 def SIL : Register<"sil">, DwarfRegNum<[4, 6, 6]>;
40 def DIL : Register<"dil">, DwarfRegNum<[5, 7, 7]>;
41 def BPL : Register<"bpl">, DwarfRegNum<[6, 4, 5]>;
42 def SPL : Register<"spl">, DwarfRegNum<[7, 5, 4]>;
43 def R8B : Register<"r8b">, DwarfRegNum<[8, -2, -2]>;
44 def R9B : Register<"r9b">, DwarfRegNum<[9, -2, -2]>;
45 def R10B : Register<"r10b">, DwarfRegNum<[10, -2, -2]>;
46 def R11B : Register<"r11b">, DwarfRegNum<[11, -2, -2]>;
47 def R12B : Register<"r12b">, DwarfRegNum<[12, -2, -2]>;
48 def R13B : Register<"r13b">, DwarfRegNum<[13, -2, -2]>;
49 def R14B : Register<"r14b">, DwarfRegNum<[14, -2, -2]>;
50 def R15B : Register<"r15b">, DwarfRegNum<[15, -2, -2]>;
52 // High registers. On x86-64, these cannot be used in any instruction
54 def AH : Register<"ah">, DwarfRegNum<[0, 0, 0]>;
55 def DH : Register<"dh">, DwarfRegNum<[1, 2, 2]>;
56 def CH : Register<"ch">, DwarfRegNum<[2, 1, 1]>;
57 def BH : Register<"bh">, DwarfRegNum<[3, 3, 3]>;
60 def AX : RegisterWithSubRegs<"ax", [AL,AH]>, DwarfRegNum<[0, 0, 0]>;
61 def DX : RegisterWithSubRegs<"dx", [DL,DH]>, DwarfRegNum<[1, 2, 2]>;
62 def CX : RegisterWithSubRegs<"cx", [CL,CH]>, DwarfRegNum<[2, 1, 1]>;
63 def BX : RegisterWithSubRegs<"bx", [BL,BH]>, DwarfRegNum<[3, 3, 3]>;
64 def SI : RegisterWithSubRegs<"si", [SIL]>, DwarfRegNum<[4, 6, 6]>;
65 def DI : RegisterWithSubRegs<"di", [DIL]>, DwarfRegNum<[5, 7, 7]>;
66 def BP : RegisterWithSubRegs<"bp", [BPL]>, DwarfRegNum<[6, 4, 5]>;
67 def SP : RegisterWithSubRegs<"sp", [SPL]>, DwarfRegNum<[7, 5, 4]>;
68 def IP : Register<"ip">, DwarfRegNum<[16]>;
71 def R8W : RegisterWithSubRegs<"r8w", [R8B]>, DwarfRegNum<[8, -2, -2]>;
72 def R9W : RegisterWithSubRegs<"r9w", [R9B]>, DwarfRegNum<[9, -2, -2]>;
73 def R10W : RegisterWithSubRegs<"r10w", [R10B]>, DwarfRegNum<[10, -2, -2]>;
74 def R11W : RegisterWithSubRegs<"r11w", [R11B]>, DwarfRegNum<[11, -2, -2]>;
75 def R12W : RegisterWithSubRegs<"r12w", [R12B]>, DwarfRegNum<[12, -2, -2]>;
76 def R13W : RegisterWithSubRegs<"r13w", [R13B]>, DwarfRegNum<[13, -2, -2]>;
77 def R14W : RegisterWithSubRegs<"r14w", [R14B]>, DwarfRegNum<[14, -2, -2]>;
78 def R15W : RegisterWithSubRegs<"r15w", [R15B]>, DwarfRegNum<[15, -2, -2]>;
81 def EAX : RegisterWithSubRegs<"eax", [AX]>, DwarfRegNum<[0, 0, 0]>;
82 def EDX : RegisterWithSubRegs<"edx", [DX]>, DwarfRegNum<[1, 2, 2]>;
83 def ECX : RegisterWithSubRegs<"ecx", [CX]>, DwarfRegNum<[2, 1, 1]>;
84 def EBX : RegisterWithSubRegs<"ebx", [BX]>, DwarfRegNum<[3, 3, 3]>;
85 def ESI : RegisterWithSubRegs<"esi", [SI]>, DwarfRegNum<[4, 6, 6]>;
86 def EDI : RegisterWithSubRegs<"edi", [DI]>, DwarfRegNum<[5, 7, 7]>;
87 def EBP : RegisterWithSubRegs<"ebp", [BP]>, DwarfRegNum<[6, 4, 5]>;
88 def ESP : RegisterWithSubRegs<"esp", [SP]>, DwarfRegNum<[7, 5, 4]>;
89 def EIP : RegisterWithSubRegs<"eip", [IP]>, DwarfRegNum<[16, 8, 8]>;
92 def R8D : RegisterWithSubRegs<"r8d", [R8W]>, DwarfRegNum<[8, -2, -2]>;
93 def R9D : RegisterWithSubRegs<"r9d", [R9W]>, DwarfRegNum<[9, -2, -2]>;
94 def R10D : RegisterWithSubRegs<"r10d", [R10W]>, DwarfRegNum<[10, -2, -2]>;
95 def R11D : RegisterWithSubRegs<"r11d", [R11W]>, DwarfRegNum<[11, -2, -2]>;
96 def R12D : RegisterWithSubRegs<"r12d", [R12W]>, DwarfRegNum<[12, -2, -2]>;
97 def R13D : RegisterWithSubRegs<"r13d", [R13W]>, DwarfRegNum<[13, -2, -2]>;
98 def R14D : RegisterWithSubRegs<"r14d", [R14W]>, DwarfRegNum<[14, -2, -2]>;
99 def R15D : RegisterWithSubRegs<"r15d", [R15W]>, DwarfRegNum<[15, -2, -2]>;
101 // 64-bit registers, X86-64 only
102 def RAX : RegisterWithSubRegs<"rax", [EAX]>, DwarfRegNum<[0, -2, -2]>;
103 def RDX : RegisterWithSubRegs<"rdx", [EDX]>, DwarfRegNum<[1, -2, -2]>;
104 def RCX : RegisterWithSubRegs<"rcx", [ECX]>, DwarfRegNum<[2, -2, -2]>;
105 def RBX : RegisterWithSubRegs<"rbx", [EBX]>, DwarfRegNum<[3, -2, -2]>;
106 def RSI : RegisterWithSubRegs<"rsi", [ESI]>, DwarfRegNum<[4, -2, -2]>;
107 def RDI : RegisterWithSubRegs<"rdi", [EDI]>, DwarfRegNum<[5, -2, -2]>;
108 def RBP : RegisterWithSubRegs<"rbp", [EBP]>, DwarfRegNum<[6, -2, -2]>;
109 def RSP : RegisterWithSubRegs<"rsp", [ESP]>, DwarfRegNum<[7, -2, -2]>;
111 def R8 : RegisterWithSubRegs<"r8", [R8D]>, DwarfRegNum<[8, -2, -2]>;
112 def R9 : RegisterWithSubRegs<"r9", [R9D]>, DwarfRegNum<[9, -2, -2]>;
113 def R10 : RegisterWithSubRegs<"r10", [R10D]>, DwarfRegNum<[10, -2, -2]>;
114 def R11 : RegisterWithSubRegs<"r11", [R11D]>, DwarfRegNum<[11, -2, -2]>;
115 def R12 : RegisterWithSubRegs<"r12", [R12D]>, DwarfRegNum<[12, -2, -2]>;
116 def R13 : RegisterWithSubRegs<"r13", [R13D]>, DwarfRegNum<[13, -2, -2]>;
117 def R14 : RegisterWithSubRegs<"r14", [R14D]>, DwarfRegNum<[14, -2, -2]>;
118 def R15 : RegisterWithSubRegs<"r15", [R15D]>, DwarfRegNum<[15, -2, -2]>;
119 def RIP : RegisterWithSubRegs<"rip", [EIP]>, DwarfRegNum<[16, -2, -2]>;
121 // MMX Registers. These are actually aliased to ST0 .. ST7
122 def MM0 : Register<"mm0">, DwarfRegNum<[41, 29, 29]>;
123 def MM1 : Register<"mm1">, DwarfRegNum<[42, 30, 30]>;
124 def MM2 : Register<"mm2">, DwarfRegNum<[43, 31, 31]>;
125 def MM3 : Register<"mm3">, DwarfRegNum<[44, 32, 32]>;
126 def MM4 : Register<"mm4">, DwarfRegNum<[45, 33, 33]>;
127 def MM5 : Register<"mm5">, DwarfRegNum<[46, 34, 34]>;
128 def MM6 : Register<"mm6">, DwarfRegNum<[47, 35, 35]>;
129 def MM7 : Register<"mm7">, DwarfRegNum<[48, 36, 36]>;
131 // Pseudo Floating Point registers
132 def FP0 : Register<"fp0">;
133 def FP1 : Register<"fp1">;
134 def FP2 : Register<"fp2">;
135 def FP3 : Register<"fp3">;
136 def FP4 : Register<"fp4">;
137 def FP5 : Register<"fp5">;
138 def FP6 : Register<"fp6">;
140 // XMM Registers, used by the various SSE instruction set extensions
141 def XMM0: Register<"xmm0">, DwarfRegNum<[17, 21, 21]>;
142 def XMM1: Register<"xmm1">, DwarfRegNum<[18, 22, 22]>;
143 def XMM2: Register<"xmm2">, DwarfRegNum<[19, 23, 23]>;
144 def XMM3: Register<"xmm3">, DwarfRegNum<[20, 24, 24]>;
145 def XMM4: Register<"xmm4">, DwarfRegNum<[21, 25, 25]>;
146 def XMM5: Register<"xmm5">, DwarfRegNum<[22, 26, 26]>;
147 def XMM6: Register<"xmm6">, DwarfRegNum<[23, 27, 27]>;
148 def XMM7: Register<"xmm7">, DwarfRegNum<[24, 28, 28]>;
151 def XMM8: Register<"xmm8">, DwarfRegNum<[25, -2, -2]>;
152 def XMM9: Register<"xmm9">, DwarfRegNum<[26, -2, -2]>;
153 def XMM10: Register<"xmm10">, DwarfRegNum<[27, -2, -2]>;
154 def XMM11: Register<"xmm11">, DwarfRegNum<[28, -2, -2]>;
155 def XMM12: Register<"xmm12">, DwarfRegNum<[29, -2, -2]>;
156 def XMM13: Register<"xmm13">, DwarfRegNum<[30, -2, -2]>;
157 def XMM14: Register<"xmm14">, DwarfRegNum<[31, -2, -2]>;
158 def XMM15: Register<"xmm15">, DwarfRegNum<[32, -2, -2]>;
160 // YMM Registers, used by AVX instructions
161 def YMM0: Register<"ymm0">, DwarfRegNum<[17, 21, 21]>;
162 def YMM1: Register<"ymm1">, DwarfRegNum<[18, 22, 22]>;
163 def YMM2: Register<"ymm2">, DwarfRegNum<[19, 23, 23]>;
164 def YMM3: Register<"ymm3">, DwarfRegNum<[20, 24, 24]>;
165 def YMM4: Register<"ymm4">, DwarfRegNum<[21, 25, 25]>;
166 def YMM5: Register<"ymm5">, DwarfRegNum<[22, 26, 26]>;
167 def YMM6: Register<"ymm6">, DwarfRegNum<[23, 27, 27]>;
168 def YMM7: Register<"ymm7">, DwarfRegNum<[24, 28, 28]>;
169 def YMM8: Register<"ymm8">, DwarfRegNum<[25, -2, -2]>;
170 def YMM9: Register<"ymm9">, DwarfRegNum<[26, -2, -2]>;
171 def YMM10: Register<"ymm10">, DwarfRegNum<[27, -2, -2]>;
172 def YMM11: Register<"ymm11">, DwarfRegNum<[28, -2, -2]>;
173 def YMM12: Register<"ymm12">, DwarfRegNum<[29, -2, -2]>;
174 def YMM13: Register<"ymm13">, DwarfRegNum<[30, -2, -2]>;
175 def YMM14: Register<"ymm14">, DwarfRegNum<[31, -2, -2]>;
176 def YMM15: Register<"ymm15">, DwarfRegNum<[32, -2, -2]>;
178 // Floating point stack registers
179 def ST0 : Register<"st(0)">, DwarfRegNum<[33, 12, 11]>;
180 def ST1 : Register<"st(1)">, DwarfRegNum<[34, 13, 12]>;
181 def ST2 : Register<"st(2)">, DwarfRegNum<[35, 14, 13]>;
182 def ST3 : Register<"st(3)">, DwarfRegNum<[36, 15, 14]>;
183 def ST4 : Register<"st(4)">, DwarfRegNum<[37, 16, 15]>;
184 def ST5 : Register<"st(5)">, DwarfRegNum<[38, 17, 16]>;
185 def ST6 : Register<"st(6)">, DwarfRegNum<[39, 18, 17]>;
186 def ST7 : Register<"st(7)">, DwarfRegNum<[40, 19, 18]>;
188 // Status flags register
189 def EFLAGS : Register<"flags">;
192 def CS : Register<"cs">;
193 def DS : Register<"ds">;
194 def SS : Register<"ss">;
195 def ES : Register<"es">;
196 def FS : Register<"fs">;
197 def GS : Register<"gs">;
201 //===----------------------------------------------------------------------===//
202 // Subregister Set Definitions... now that we have all of the pieces, define the
203 // sub registers for each register.
206 def x86_subreg_8bit : PatLeaf<(i32 1)>;
207 def x86_subreg_8bit_hi : PatLeaf<(i32 2)>;
208 def x86_subreg_16bit : PatLeaf<(i32 3)>;
209 def x86_subreg_32bit : PatLeaf<(i32 4)>;
211 def : SubRegSet<1, [AX, CX, DX, BX, SP, BP, SI, DI,
212 R8W, R9W, R10W, R11W, R12W, R13W, R14W, R15W],
213 [AL, CL, DL, BL, SPL, BPL, SIL, DIL,
214 R8B, R9B, R10B, R11B, R12B, R13B, R14B, R15B]>;
216 def : SubRegSet<2, [AX, CX, DX, BX],
219 def : SubRegSet<1, [EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI,
220 R8D, R9D, R10D, R11D, R12D, R13D, R14D, R15D],
221 [AL, CL, DL, BL, SPL, BPL, SIL, DIL,
222 R8B, R9B, R10B, R11B, R12B, R13B, R14B, R15B]>;
224 def : SubRegSet<2, [EAX, ECX, EDX, EBX],
227 def : SubRegSet<3, [EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI,
228 R8D, R9D, R10D, R11D, R12D, R13D, R14D, R15D],
229 [AX, CX, DX, BX, SP, BP, SI, DI,
230 R8W, R9W, R10W, R11W, R12W, R13W, R14W, R15W]>;
232 def : SubRegSet<1, [RAX, RCX, RDX, RBX, RSP, RBP, RSI, RDI,
233 R8, R9, R10, R11, R12, R13, R14, R15],
234 [AL, CL, DL, BL, SPL, BPL, SIL, DIL,
235 R8B, R9B, R10B, R11B, R12B, R13B, R14B, R15B]>;
237 def : SubRegSet<2, [RAX, RCX, RDX, RBX],
240 def : SubRegSet<3, [RAX, RCX, RDX, RBX, RSP, RBP, RSI, RDI,
241 R8, R9, R10, R11, R12, R13, R14, R15],
242 [AX, CX, DX, BX, SP, BP, SI, DI,
243 R8W, R9W, R10W, R11W, R12W, R13W, R14W, R15W]>;
245 def : SubRegSet<4, [RAX, RCX, RDX, RBX, RSP, RBP, RSI, RDI,
246 R8, R9, R10, R11, R12, R13, R14, R15],
247 [EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI,
248 R8D, R9D, R10D, R11D, R12D, R13D, R14D, R15D]>;
250 def : SubRegSet<1, [YMM0, YMM1, YMM2, YMM3, YMM4, YMM5, YMM6, YMM7,
251 YMM8, YMM9, YMM10, YMM11, YMM12, YMM13, YMM14, YMM15],
252 [XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7,
253 XMM8, XMM9, XMM10, XMM11, XMM12, XMM13, XMM14, XMM15]>;
255 //===----------------------------------------------------------------------===//
256 // Register Class Definitions... now that we have all of the pieces, define the
257 // top-level register classes. The order specified in the register list is
258 // implicitly defined to be the register allocation order.
261 // List call-clobbered registers before callee-save registers. RBX, RBP, (and
262 // R12, R13, R14, and R15 for X86-64) are callee-save registers.
263 // In 64-mode, there are 12 additional i8 registers, SIL, DIL, BPL, SPL, and
265 // Allocate R12 and R13 last, as these require an extra byte when
266 // encoded in x86_64 instructions.
267 // FIXME: Allow AH, CH, DH, BH to be used as general-purpose registers in
268 // 64-bit mode. The main complication is that they cannot be encoded in an
269 // instruction requiring a REX prefix, while SIL, DIL, BPL, R8D, etc.
270 // require a REX prefix. For example, "addb %ah, %dil" and "movzbl %ah, %r8d"
271 // cannot be encoded.
272 def GR8 : RegisterClass<"X86", [i8], 8,
273 [AL, CL, DL, AH, CH, DH, BL, BH, SIL, DIL, BPL, SPL,
274 R8B, R9B, R10B, R11B, R14B, R15B, R12B, R13B]> {
275 let MethodProtos = [{
276 iterator allocation_order_begin(const MachineFunction &MF) const;
277 iterator allocation_order_end(const MachineFunction &MF) const;
279 let MethodBodies = [{
280 static const unsigned X86_GR8_AO_64[] = {
281 X86::AL, X86::CL, X86::DL, X86::SIL, X86::DIL,
282 X86::R8B, X86::R9B, X86::R10B, X86::R11B,
283 X86::BL, X86::R14B, X86::R15B, X86::R12B, X86::R13B, X86::BPL
287 GR8Class::allocation_order_begin(const MachineFunction &MF) const {
288 const TargetMachine &TM = MF.getTarget();
289 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
290 if (Subtarget.is64Bit())
291 return X86_GR8_AO_64;
297 GR8Class::allocation_order_end(const MachineFunction &MF) const {
298 const TargetMachine &TM = MF.getTarget();
299 const TargetRegisterInfo *RI = TM.getRegisterInfo();
300 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
301 // Does the function dedicate RBP / EBP to being a frame ptr?
302 if (!Subtarget.is64Bit())
303 // In 32-mode, none of the 8-bit registers aliases EBP or ESP.
305 else if (RI->hasFP(MF))
306 // If so, don't allocate SPL or BPL.
307 return array_endof(X86_GR8_AO_64) - 1;
309 // If not, just don't allocate SPL.
310 return array_endof(X86_GR8_AO_64);
315 def GR16 : RegisterClass<"X86", [i16], 16,
316 [AX, CX, DX, SI, DI, BX, BP, SP,
317 R8W, R9W, R10W, R11W, R14W, R15W, R12W, R13W]> {
318 let SubRegClassList = [GR8, GR8];
319 let MethodProtos = [{
320 iterator allocation_order_begin(const MachineFunction &MF) const;
321 iterator allocation_order_end(const MachineFunction &MF) const;
323 let MethodBodies = [{
324 static const unsigned X86_GR16_AO_64[] = {
325 X86::AX, X86::CX, X86::DX, X86::SI, X86::DI,
326 X86::R8W, X86::R9W, X86::R10W, X86::R11W,
327 X86::BX, X86::R14W, X86::R15W, X86::R12W, X86::R13W, X86::BP
331 GR16Class::allocation_order_begin(const MachineFunction &MF) const {
332 const TargetMachine &TM = MF.getTarget();
333 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
334 if (Subtarget.is64Bit())
335 return X86_GR16_AO_64;
341 GR16Class::allocation_order_end(const MachineFunction &MF) const {
342 const TargetMachine &TM = MF.getTarget();
343 const TargetRegisterInfo *RI = TM.getRegisterInfo();
344 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
345 if (Subtarget.is64Bit()) {
346 // Does the function dedicate RBP to being a frame ptr?
348 // If so, don't allocate SP or BP.
349 return array_endof(X86_GR16_AO_64) - 1;
351 // If not, just don't allocate SP.
352 return array_endof(X86_GR16_AO_64);
354 // Does the function dedicate EBP to being a frame ptr?
356 // If so, don't allocate SP or BP.
359 // If not, just don't allocate SP.
366 def GR32 : RegisterClass<"X86", [i32], 32,
367 [EAX, ECX, EDX, ESI, EDI, EBX, EBP, ESP,
368 R8D, R9D, R10D, R11D, R14D, R15D, R12D, R13D]> {
369 let SubRegClassList = [GR8, GR8, GR16];
370 let MethodProtos = [{
371 iterator allocation_order_begin(const MachineFunction &MF) const;
372 iterator allocation_order_end(const MachineFunction &MF) const;
374 let MethodBodies = [{
375 static const unsigned X86_GR32_AO_64[] = {
376 X86::EAX, X86::ECX, X86::EDX, X86::ESI, X86::EDI,
377 X86::R8D, X86::R9D, X86::R10D, X86::R11D,
378 X86::EBX, X86::R14D, X86::R15D, X86::R12D, X86::R13D, X86::EBP
382 GR32Class::allocation_order_begin(const MachineFunction &MF) const {
383 const TargetMachine &TM = MF.getTarget();
384 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
385 if (Subtarget.is64Bit())
386 return X86_GR32_AO_64;
392 GR32Class::allocation_order_end(const MachineFunction &MF) const {
393 const TargetMachine &TM = MF.getTarget();
394 const TargetRegisterInfo *RI = TM.getRegisterInfo();
395 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
396 if (Subtarget.is64Bit()) {
397 // Does the function dedicate RBP to being a frame ptr?
399 // If so, don't allocate ESP or EBP.
400 return array_endof(X86_GR32_AO_64) - 1;
402 // If not, just don't allocate ESP.
403 return array_endof(X86_GR32_AO_64);
405 // Does the function dedicate EBP to being a frame ptr?
407 // If so, don't allocate ESP or EBP.
410 // If not, just don't allocate ESP.
417 // GR64 - 64-bit GPRs. This oddly includes RIP, which isn't accurate, since
418 // RIP isn't really a register and it can't be used anywhere except in an
419 // address, but it doesn't cause trouble.
420 def GR64 : RegisterClass<"X86", [i64], 64,
421 [RAX, RCX, RDX, RSI, RDI, R8, R9, R10, R11,
422 RBX, R14, R15, R12, R13, RBP, RSP, RIP]> {
423 let SubRegClassList = [GR8, GR8, GR16, GR32];
424 let MethodProtos = [{
425 iterator allocation_order_end(const MachineFunction &MF) const;
427 let MethodBodies = [{
429 GR64Class::allocation_order_end(const MachineFunction &MF) const {
430 const TargetMachine &TM = MF.getTarget();
431 const TargetRegisterInfo *RI = TM.getRegisterInfo();
432 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
433 if (!Subtarget.is64Bit())
434 return begin(); // None of these are allocatable in 32-bit.
435 if (RI->hasFP(MF)) // Does the function dedicate RBP to being a frame ptr?
436 return end()-3; // If so, don't allocate RIP, RSP or RBP
438 return end()-2; // If not, just don't allocate RIP or RSP
443 // Segment registers for use by MOV instructions (and others) that have a
444 // segment register as one operand. Always contain a 16-bit segment
446 def SEGMENT_REG : RegisterClass<"X86", [i16], 16, [CS, DS, SS, ES, FS, GS]> {
449 // GR8_ABCD_L, GR8_ABCD_H, GR16_ABCD, GR32_ABCD, GR64_ABCD - Subclasses of
450 // GR8, GR16, GR32, and GR64 which contain just the "a" "b", "c", and "d"
451 // registers. On x86-32, GR16_ABCD and GR32_ABCD are classes for registers
452 // that support 8-bit subreg operations. On x86-64, GR16_ABCD, GR32_ABCD,
453 // and GR64_ABCD are classes for registers that support 8-bit h-register
455 def GR8_ABCD_L : RegisterClass<"X86", [i8], 8, [AL, CL, DL, BL]> {
457 def GR8_ABCD_H : RegisterClass<"X86", [i8], 8, [AH, CH, DH, BH]> {
459 def GR16_ABCD : RegisterClass<"X86", [i16], 16, [AX, CX, DX, BX]> {
460 let SubRegClassList = [GR8_ABCD_L, GR8_ABCD_H];
462 def GR32_ABCD : RegisterClass<"X86", [i32], 32, [EAX, ECX, EDX, EBX]> {
463 let SubRegClassList = [GR8_ABCD_L, GR8_ABCD_H, GR16_ABCD];
465 def GR64_ABCD : RegisterClass<"X86", [i64], 64, [RAX, RCX, RDX, RBX]> {
466 let SubRegClassList = [GR8_ABCD_L, GR8_ABCD_H, GR16_ABCD, GR32_ABCD];
469 // GR8_NOREX, GR16_NOREX, GR32_NOREX, GR64_NOREX - Subclasses of
470 // GR8, GR16, GR32, and GR64 which contain only the first 8 GPRs.
471 // On x86-64, GR64_NOREX, GR32_NOREX and GR16_NOREX are the classes
472 // of registers which do not by themselves require a REX prefix.
473 def GR8_NOREX : RegisterClass<"X86", [i8], 8,
474 [AL, CL, DL, AH, CH, DH, BL, BH,
475 SIL, DIL, BPL, SPL]> {
476 let MethodProtos = [{
477 iterator allocation_order_begin(const MachineFunction &MF) const;
478 iterator allocation_order_end(const MachineFunction &MF) const;
480 let MethodBodies = [{
481 static const unsigned X86_GR8_NOREX_AO_64[] = {
482 X86::AL, X86::CL, X86::DL, X86::SIL, X86::DIL, X86::BL, X86::BPL
485 GR8_NOREXClass::iterator
486 GR8_NOREXClass::allocation_order_begin(const MachineFunction &MF) const {
487 const TargetMachine &TM = MF.getTarget();
488 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
489 if (Subtarget.is64Bit())
490 return X86_GR8_NOREX_AO_64;
495 GR8_NOREXClass::iterator
496 GR8_NOREXClass::allocation_order_end(const MachineFunction &MF) const {
497 const TargetMachine &TM = MF.getTarget();
498 const TargetRegisterInfo *RI = TM.getRegisterInfo();
499 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
500 // Does the function dedicate RBP / EBP to being a frame ptr?
501 if (!Subtarget.is64Bit())
502 // In 32-mode, none of the 8-bit registers aliases EBP or ESP.
504 else if (RI->hasFP(MF))
505 // If so, don't allocate SPL or BPL.
506 return array_endof(X86_GR8_NOREX_AO_64) - 1;
508 // If not, just don't allocate SPL.
509 return array_endof(X86_GR8_NOREX_AO_64);
513 def GR16_NOREX : RegisterClass<"X86", [i16], 16,
514 [AX, CX, DX, SI, DI, BX, BP, SP]> {
515 let SubRegClassList = [GR8_NOREX, GR8_NOREX];
516 let MethodProtos = [{
517 iterator allocation_order_end(const MachineFunction &MF) const;
519 let MethodBodies = [{
520 GR16_NOREXClass::iterator
521 GR16_NOREXClass::allocation_order_end(const MachineFunction &MF) const {
522 const TargetMachine &TM = MF.getTarget();
523 const TargetRegisterInfo *RI = TM.getRegisterInfo();
524 // Does the function dedicate RBP / EBP to being a frame ptr?
526 // If so, don't allocate SP or BP.
529 // If not, just don't allocate SP.
534 // GR32_NOREX - GR32 registers which do not require a REX prefix.
535 def GR32_NOREX : RegisterClass<"X86", [i32], 32,
536 [EAX, ECX, EDX, ESI, EDI, EBX, EBP, ESP]> {
537 let SubRegClassList = [GR8_NOREX, GR8_NOREX, GR16_NOREX];
538 let MethodProtos = [{
539 iterator allocation_order_end(const MachineFunction &MF) const;
541 let MethodBodies = [{
542 GR32_NOREXClass::iterator
543 GR32_NOREXClass::allocation_order_end(const MachineFunction &MF) const {
544 const TargetMachine &TM = MF.getTarget();
545 const TargetRegisterInfo *RI = TM.getRegisterInfo();
546 // Does the function dedicate RBP / EBP to being a frame ptr?
548 // If so, don't allocate ESP or EBP.
551 // If not, just don't allocate ESP.
556 // GR64_NOREX - GR64 registers which do not require a REX prefix.
557 def GR64_NOREX : RegisterClass<"X86", [i64], 64,
558 [RAX, RCX, RDX, RSI, RDI, RBX, RBP, RSP]> {
559 let SubRegClassList = [GR8_NOREX, GR8_NOREX, GR16_NOREX, GR32_NOREX];
560 let MethodProtos = [{
561 iterator allocation_order_end(const MachineFunction &MF) const;
563 let MethodBodies = [{
564 GR64_NOREXClass::iterator
565 GR64_NOREXClass::allocation_order_end(const MachineFunction &MF) const {
566 const TargetMachine &TM = MF.getTarget();
567 const TargetRegisterInfo *RI = TM.getRegisterInfo();
568 // Does the function dedicate RBP to being a frame ptr?
570 // If so, don't allocate RSP or RBP.
573 // If not, just don't allocate RSP.
579 // GR32_NOSP - GR32 registers except ESP.
580 def GR32_NOSP : RegisterClass<"X86", [i32], 32,
581 [EAX, ECX, EDX, ESI, EDI, EBX, EBP,
582 R8D, R9D, R10D, R11D, R14D, R15D, R12D, R13D]> {
583 let SubRegClassList = [GR8, GR8, GR16];
584 let MethodProtos = [{
585 iterator allocation_order_begin(const MachineFunction &MF) const;
586 iterator allocation_order_end(const MachineFunction &MF) const;
588 let MethodBodies = [{
589 static const unsigned X86_GR32_NOSP_AO_64[] = {
590 X86::EAX, X86::ECX, X86::EDX, X86::ESI, X86::EDI,
591 X86::R8D, X86::R9D, X86::R10D, X86::R11D,
592 X86::EBX, X86::R14D, X86::R15D, X86::R12D, X86::R13D, X86::EBP
595 GR32_NOSPClass::iterator
596 GR32_NOSPClass::allocation_order_begin(const MachineFunction &MF) const {
597 const TargetMachine &TM = MF.getTarget();
598 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
599 if (Subtarget.is64Bit())
600 return X86_GR32_NOSP_AO_64;
605 GR32_NOSPClass::iterator
606 GR32_NOSPClass::allocation_order_end(const MachineFunction &MF) const {
607 const TargetMachine &TM = MF.getTarget();
608 const TargetRegisterInfo *RI = TM.getRegisterInfo();
609 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
610 if (Subtarget.is64Bit()) {
611 // Does the function dedicate RBP to being a frame ptr?
613 // If so, don't allocate EBP.
614 return array_endof(X86_GR32_NOSP_AO_64) - 1;
616 // If not, any reg in this class is ok.
617 return array_endof(X86_GR32_NOSP_AO_64);
619 // Does the function dedicate EBP to being a frame ptr?
621 // If so, don't allocate EBP.
624 // If not, any reg in this class is ok.
631 // GR64_NOSP - GR64 registers except RSP (and RIP).
632 def GR64_NOSP : RegisterClass<"X86", [i64], 64,
633 [RAX, RCX, RDX, RSI, RDI, R8, R9, R10, R11,
634 RBX, R14, R15, R12, R13, RBP]> {
635 let SubRegClassList = [GR8, GR8, GR16, GR32_NOSP];
636 let MethodProtos = [{
637 iterator allocation_order_end(const MachineFunction &MF) const;
639 let MethodBodies = [{
640 GR64_NOSPClass::iterator
641 GR64_NOSPClass::allocation_order_end(const MachineFunction &MF) const {
642 const TargetMachine &TM = MF.getTarget();
643 const TargetRegisterInfo *RI = TM.getRegisterInfo();
644 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
645 if (!Subtarget.is64Bit())
646 return begin(); // None of these are allocatable in 32-bit.
647 if (RI->hasFP(MF)) // Does the function dedicate RBP to being a frame ptr?
648 return end()-1; // If so, don't allocate RBP
650 return end(); // If not, any reg in this class is ok.
655 // GR64_NOREX_NOSP - GR64_NOREX registers except RSP.
656 def GR64_NOREX_NOSP : RegisterClass<"X86", [i64], 64,
657 [RAX, RCX, RDX, RSI, RDI, RBX, RBP]> {
658 let SubRegClassList = [GR8_NOREX, GR8_NOREX, GR16_NOREX, GR32_NOREX];
659 let MethodProtos = [{
660 iterator allocation_order_end(const MachineFunction &MF) const;
662 let MethodBodies = [{
663 GR64_NOREX_NOSPClass::iterator
664 GR64_NOREX_NOSPClass::allocation_order_end(const MachineFunction &MF) const {
665 const TargetMachine &TM = MF.getTarget();
666 const TargetRegisterInfo *RI = TM.getRegisterInfo();
667 // Does the function dedicate RBP to being a frame ptr?
669 // If so, don't allocate RBP.
672 // If not, any reg in this class is ok.
678 // A class to support the 'A' assembler constraint: EAX then EDX.
679 def GR32_AD : RegisterClass<"X86", [i32], 32, [EAX, EDX]> {
680 let SubRegClassList = [GR8_ABCD_L, GR8_ABCD_H, GR16_ABCD];
683 // Scalar SSE2 floating point registers.
684 def FR32 : RegisterClass<"X86", [f32], 32,
685 [XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7,
686 XMM8, XMM9, XMM10, XMM11,
687 XMM12, XMM13, XMM14, XMM15]> {
688 let MethodProtos = [{
689 iterator allocation_order_end(const MachineFunction &MF) const;
691 let MethodBodies = [{
693 FR32Class::allocation_order_end(const MachineFunction &MF) const {
694 const TargetMachine &TM = MF.getTarget();
695 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
696 if (!Subtarget.is64Bit())
697 return end()-8; // Only XMM0 to XMM7 are available in 32-bit mode.
704 def FR64 : RegisterClass<"X86", [f64], 64,
705 [XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7,
706 XMM8, XMM9, XMM10, XMM11,
707 XMM12, XMM13, XMM14, XMM15]> {
708 let MethodProtos = [{
709 iterator allocation_order_end(const MachineFunction &MF) const;
711 let MethodBodies = [{
713 FR64Class::allocation_order_end(const MachineFunction &MF) const {
714 const TargetMachine &TM = MF.getTarget();
715 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
716 if (!Subtarget.is64Bit())
717 return end()-8; // Only XMM0 to XMM7 are available in 32-bit mode.
725 // FIXME: This sets up the floating point register files as though they are f64
726 // values, though they really are f80 values. This will cause us to spill
727 // values as 64-bit quantities instead of 80-bit quantities, which is much much
728 // faster on common hardware. In reality, this should be controlled by a
729 // command line option or something.
731 def RFP32 : RegisterClass<"X86",[f32], 32, [FP0, FP1, FP2, FP3, FP4, FP5, FP6]>;
732 def RFP64 : RegisterClass<"X86",[f64], 32, [FP0, FP1, FP2, FP3, FP4, FP5, FP6]>;
733 def RFP80 : RegisterClass<"X86",[f80], 32, [FP0, FP1, FP2, FP3, FP4, FP5, FP6]>;
735 // Floating point stack registers (these are not allocatable by the
736 // register allocator - the floating point stackifier is responsible
737 // for transforming FPn allocations to STn registers)
738 def RST : RegisterClass<"X86", [f80, f64, f32], 32,
739 [ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7]> {
740 let MethodProtos = [{
741 iterator allocation_order_end(const MachineFunction &MF) const;
743 let MethodBodies = [{
745 RSTClass::allocation_order_end(const MachineFunction &MF) const {
751 // Generic vector registers: VR64 and VR128.
752 def VR64 : RegisterClass<"X86", [v8i8, v4i16, v2i32, v1i64, v2f32], 64,
753 [MM0, MM1, MM2, MM3, MM4, MM5, MM6, MM7]>;
754 def VR128 : RegisterClass<"X86", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],128,
755 [XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7,
756 XMM8, XMM9, XMM10, XMM11,
757 XMM12, XMM13, XMM14, XMM15]> {
758 let MethodProtos = [{
759 iterator allocation_order_end(const MachineFunction &MF) const;
761 let MethodBodies = [{
763 VR128Class::allocation_order_end(const MachineFunction &MF) const {
764 const TargetMachine &TM = MF.getTarget();
765 const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
766 if (!Subtarget.is64Bit())
767 return end()-8; // Only XMM0 to XMM7 are available in 32-bit mode.
773 def VR256 : RegisterClass<"X86", [ v8i32, v4i64, v8f32, v4f64],256,
774 [YMM0, YMM1, YMM2, YMM3, YMM4, YMM5, YMM6, YMM7,
775 YMM8, YMM9, YMM10, YMM11,
776 YMM12, YMM13, YMM14, YMM15]>;
778 // Status flags registers.
779 def CCR : RegisterClass<"X86", [i32], 32, [EFLAGS]> {
780 let CopyCost = -1; // Don't allow copying of status registers.