1 //===- X86InstrInfo.cpp - X86 Instruction Information -----------*- C++ -*-===//
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 contains the X86 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "X86InstrInfo.h"
16 #include "X86InstrBuilder.h"
17 #include "X86MachineFunctionInfo.h"
18 #include "X86Subtarget.h"
19 #include "X86TargetMachine.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/LLVMContext.h"
22 #include "llvm/ADT/STLExtras.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineFrameInfo.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineRegisterInfo.h"
27 #include "llvm/CodeGen/LiveVariables.h"
28 #include "llvm/CodeGen/PseudoSourceValue.h"
29 #include "llvm/MC/MCInst.h"
30 #include "llvm/Support/CommandLine.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/raw_ostream.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/MC/MCAsmInfo.h"
38 #define GET_INSTRINFO_CTOR
39 #define GET_INSTRINFO_MC_DESC
40 #include "X86GenInstrInfo.inc"
45 NoFusing("disable-spill-fusing",
46 cl::desc("Disable fusing of spill code into instructions"));
48 PrintFailedFusing("print-failed-fuse-candidates",
49 cl::desc("Print instructions that the allocator wants to"
50 " fuse, but the X86 backend currently can't"),
53 ReMatPICStubLoad("remat-pic-stub-load",
54 cl::desc("Re-materialize load from stub in PIC mode"),
55 cl::init(false), cl::Hidden);
57 X86InstrInfo::X86InstrInfo(X86TargetMachine &tm)
58 : X86GenInstrInfo((tm.getSubtarget<X86Subtarget>().is64Bit()
59 ? X86::ADJCALLSTACKDOWN64
60 : X86::ADJCALLSTACKDOWN32),
61 (tm.getSubtarget<X86Subtarget>().is64Bit()
62 ? X86::ADJCALLSTACKUP64
63 : X86::ADJCALLSTACKUP32)),
64 TM(tm), RI(tm, *this) {
66 TB_NOT_REVERSABLE = 1U << 31,
67 TB_FLAGS = TB_NOT_REVERSABLE
70 static const unsigned OpTbl2Addr[][2] = {
71 { X86::ADC32ri, X86::ADC32mi },
72 { X86::ADC32ri8, X86::ADC32mi8 },
73 { X86::ADC32rr, X86::ADC32mr },
74 { X86::ADC64ri32, X86::ADC64mi32 },
75 { X86::ADC64ri8, X86::ADC64mi8 },
76 { X86::ADC64rr, X86::ADC64mr },
77 { X86::ADD16ri, X86::ADD16mi },
78 { X86::ADD16ri8, X86::ADD16mi8 },
79 { X86::ADD16ri_DB, X86::ADD16mi | TB_NOT_REVERSABLE },
80 { X86::ADD16ri8_DB, X86::ADD16mi8 | TB_NOT_REVERSABLE },
81 { X86::ADD16rr, X86::ADD16mr },
82 { X86::ADD16rr_DB, X86::ADD16mr | TB_NOT_REVERSABLE },
83 { X86::ADD32ri, X86::ADD32mi },
84 { X86::ADD32ri8, X86::ADD32mi8 },
85 { X86::ADD32ri_DB, X86::ADD32mi | TB_NOT_REVERSABLE },
86 { X86::ADD32ri8_DB, X86::ADD32mi8 | TB_NOT_REVERSABLE },
87 { X86::ADD32rr, X86::ADD32mr },
88 { X86::ADD32rr_DB, X86::ADD32mr | TB_NOT_REVERSABLE },
89 { X86::ADD64ri32, X86::ADD64mi32 },
90 { X86::ADD64ri8, X86::ADD64mi8 },
91 { X86::ADD64ri32_DB,X86::ADD64mi32 | TB_NOT_REVERSABLE },
92 { X86::ADD64ri8_DB, X86::ADD64mi8 | TB_NOT_REVERSABLE },
93 { X86::ADD64rr, X86::ADD64mr },
94 { X86::ADD64rr_DB, X86::ADD64mr | TB_NOT_REVERSABLE },
95 { X86::ADD8ri, X86::ADD8mi },
96 { X86::ADD8rr, X86::ADD8mr },
97 { X86::AND16ri, X86::AND16mi },
98 { X86::AND16ri8, X86::AND16mi8 },
99 { X86::AND16rr, X86::AND16mr },
100 { X86::AND32ri, X86::AND32mi },
101 { X86::AND32ri8, X86::AND32mi8 },
102 { X86::AND32rr, X86::AND32mr },
103 { X86::AND64ri32, X86::AND64mi32 },
104 { X86::AND64ri8, X86::AND64mi8 },
105 { X86::AND64rr, X86::AND64mr },
106 { X86::AND8ri, X86::AND8mi },
107 { X86::AND8rr, X86::AND8mr },
108 { X86::DEC16r, X86::DEC16m },
109 { X86::DEC32r, X86::DEC32m },
110 { X86::DEC64_16r, X86::DEC64_16m },
111 { X86::DEC64_32r, X86::DEC64_32m },
112 { X86::DEC64r, X86::DEC64m },
113 { X86::DEC8r, X86::DEC8m },
114 { X86::INC16r, X86::INC16m },
115 { X86::INC32r, X86::INC32m },
116 { X86::INC64_16r, X86::INC64_16m },
117 { X86::INC64_32r, X86::INC64_32m },
118 { X86::INC64r, X86::INC64m },
119 { X86::INC8r, X86::INC8m },
120 { X86::NEG16r, X86::NEG16m },
121 { X86::NEG32r, X86::NEG32m },
122 { X86::NEG64r, X86::NEG64m },
123 { X86::NEG8r, X86::NEG8m },
124 { X86::NOT16r, X86::NOT16m },
125 { X86::NOT32r, X86::NOT32m },
126 { X86::NOT64r, X86::NOT64m },
127 { X86::NOT8r, X86::NOT8m },
128 { X86::OR16ri, X86::OR16mi },
129 { X86::OR16ri8, X86::OR16mi8 },
130 { X86::OR16rr, X86::OR16mr },
131 { X86::OR32ri, X86::OR32mi },
132 { X86::OR32ri8, X86::OR32mi8 },
133 { X86::OR32rr, X86::OR32mr },
134 { X86::OR64ri32, X86::OR64mi32 },
135 { X86::OR64ri8, X86::OR64mi8 },
136 { X86::OR64rr, X86::OR64mr },
137 { X86::OR8ri, X86::OR8mi },
138 { X86::OR8rr, X86::OR8mr },
139 { X86::ROL16r1, X86::ROL16m1 },
140 { X86::ROL16rCL, X86::ROL16mCL },
141 { X86::ROL16ri, X86::ROL16mi },
142 { X86::ROL32r1, X86::ROL32m1 },
143 { X86::ROL32rCL, X86::ROL32mCL },
144 { X86::ROL32ri, X86::ROL32mi },
145 { X86::ROL64r1, X86::ROL64m1 },
146 { X86::ROL64rCL, X86::ROL64mCL },
147 { X86::ROL64ri, X86::ROL64mi },
148 { X86::ROL8r1, X86::ROL8m1 },
149 { X86::ROL8rCL, X86::ROL8mCL },
150 { X86::ROL8ri, X86::ROL8mi },
151 { X86::ROR16r1, X86::ROR16m1 },
152 { X86::ROR16rCL, X86::ROR16mCL },
153 { X86::ROR16ri, X86::ROR16mi },
154 { X86::ROR32r1, X86::ROR32m1 },
155 { X86::ROR32rCL, X86::ROR32mCL },
156 { X86::ROR32ri, X86::ROR32mi },
157 { X86::ROR64r1, X86::ROR64m1 },
158 { X86::ROR64rCL, X86::ROR64mCL },
159 { X86::ROR64ri, X86::ROR64mi },
160 { X86::ROR8r1, X86::ROR8m1 },
161 { X86::ROR8rCL, X86::ROR8mCL },
162 { X86::ROR8ri, X86::ROR8mi },
163 { X86::SAR16r1, X86::SAR16m1 },
164 { X86::SAR16rCL, X86::SAR16mCL },
165 { X86::SAR16ri, X86::SAR16mi },
166 { X86::SAR32r1, X86::SAR32m1 },
167 { X86::SAR32rCL, X86::SAR32mCL },
168 { X86::SAR32ri, X86::SAR32mi },
169 { X86::SAR64r1, X86::SAR64m1 },
170 { X86::SAR64rCL, X86::SAR64mCL },
171 { X86::SAR64ri, X86::SAR64mi },
172 { X86::SAR8r1, X86::SAR8m1 },
173 { X86::SAR8rCL, X86::SAR8mCL },
174 { X86::SAR8ri, X86::SAR8mi },
175 { X86::SBB32ri, X86::SBB32mi },
176 { X86::SBB32ri8, X86::SBB32mi8 },
177 { X86::SBB32rr, X86::SBB32mr },
178 { X86::SBB64ri32, X86::SBB64mi32 },
179 { X86::SBB64ri8, X86::SBB64mi8 },
180 { X86::SBB64rr, X86::SBB64mr },
181 { X86::SHL16rCL, X86::SHL16mCL },
182 { X86::SHL16ri, X86::SHL16mi },
183 { X86::SHL32rCL, X86::SHL32mCL },
184 { X86::SHL32ri, X86::SHL32mi },
185 { X86::SHL64rCL, X86::SHL64mCL },
186 { X86::SHL64ri, X86::SHL64mi },
187 { X86::SHL8rCL, X86::SHL8mCL },
188 { X86::SHL8ri, X86::SHL8mi },
189 { X86::SHLD16rrCL, X86::SHLD16mrCL },
190 { X86::SHLD16rri8, X86::SHLD16mri8 },
191 { X86::SHLD32rrCL, X86::SHLD32mrCL },
192 { X86::SHLD32rri8, X86::SHLD32mri8 },
193 { X86::SHLD64rrCL, X86::SHLD64mrCL },
194 { X86::SHLD64rri8, X86::SHLD64mri8 },
195 { X86::SHR16r1, X86::SHR16m1 },
196 { X86::SHR16rCL, X86::SHR16mCL },
197 { X86::SHR16ri, X86::SHR16mi },
198 { X86::SHR32r1, X86::SHR32m1 },
199 { X86::SHR32rCL, X86::SHR32mCL },
200 { X86::SHR32ri, X86::SHR32mi },
201 { X86::SHR64r1, X86::SHR64m1 },
202 { X86::SHR64rCL, X86::SHR64mCL },
203 { X86::SHR64ri, X86::SHR64mi },
204 { X86::SHR8r1, X86::SHR8m1 },
205 { X86::SHR8rCL, X86::SHR8mCL },
206 { X86::SHR8ri, X86::SHR8mi },
207 { X86::SHRD16rrCL, X86::SHRD16mrCL },
208 { X86::SHRD16rri8, X86::SHRD16mri8 },
209 { X86::SHRD32rrCL, X86::SHRD32mrCL },
210 { X86::SHRD32rri8, X86::SHRD32mri8 },
211 { X86::SHRD64rrCL, X86::SHRD64mrCL },
212 { X86::SHRD64rri8, X86::SHRD64mri8 },
213 { X86::SUB16ri, X86::SUB16mi },
214 { X86::SUB16ri8, X86::SUB16mi8 },
215 { X86::SUB16rr, X86::SUB16mr },
216 { X86::SUB32ri, X86::SUB32mi },
217 { X86::SUB32ri8, X86::SUB32mi8 },
218 { X86::SUB32rr, X86::SUB32mr },
219 { X86::SUB64ri32, X86::SUB64mi32 },
220 { X86::SUB64ri8, X86::SUB64mi8 },
221 { X86::SUB64rr, X86::SUB64mr },
222 { X86::SUB8ri, X86::SUB8mi },
223 { X86::SUB8rr, X86::SUB8mr },
224 { X86::XOR16ri, X86::XOR16mi },
225 { X86::XOR16ri8, X86::XOR16mi8 },
226 { X86::XOR16rr, X86::XOR16mr },
227 { X86::XOR32ri, X86::XOR32mi },
228 { X86::XOR32ri8, X86::XOR32mi8 },
229 { X86::XOR32rr, X86::XOR32mr },
230 { X86::XOR64ri32, X86::XOR64mi32 },
231 { X86::XOR64ri8, X86::XOR64mi8 },
232 { X86::XOR64rr, X86::XOR64mr },
233 { X86::XOR8ri, X86::XOR8mi },
234 { X86::XOR8rr, X86::XOR8mr }
237 for (unsigned i = 0, e = array_lengthof(OpTbl2Addr); i != e; ++i) {
238 unsigned RegOp = OpTbl2Addr[i][0];
239 unsigned MemOp = OpTbl2Addr[i][1] & ~TB_FLAGS;
240 assert(!RegOp2MemOpTable2Addr.count(RegOp) && "Duplicated entries?");
241 RegOp2MemOpTable2Addr[RegOp] = std::make_pair(MemOp, 0U);
243 // If this is not a reversible operation (because there is a many->one)
244 // mapping, don't insert the reverse of the operation into MemOp2RegOpTable.
245 if (OpTbl2Addr[i][1] & TB_NOT_REVERSABLE)
248 // Index 0, folded load and store, no alignment requirement.
249 unsigned AuxInfo = 0 | (1 << 4) | (1 << 5);
251 assert(!MemOp2RegOpTable.count(MemOp) &&
252 "Duplicated entries in unfolding maps?");
253 MemOp2RegOpTable[MemOp] = std::make_pair(RegOp, AuxInfo);
256 // If the third value is 1, then it's folding either a load or a store.
257 static const unsigned OpTbl0[][4] = {
258 { X86::BT16ri8, X86::BT16mi8, 1, 0 },
259 { X86::BT32ri8, X86::BT32mi8, 1, 0 },
260 { X86::BT64ri8, X86::BT64mi8, 1, 0 },
261 { X86::CALL32r, X86::CALL32m, 1, 0 },
262 { X86::CALL64r, X86::CALL64m, 1, 0 },
263 { X86::WINCALL64r, X86::WINCALL64m, 1, 0 },
264 { X86::CMP16ri, X86::CMP16mi, 1, 0 },
265 { X86::CMP16ri8, X86::CMP16mi8, 1, 0 },
266 { X86::CMP16rr, X86::CMP16mr, 1, 0 },
267 { X86::CMP32ri, X86::CMP32mi, 1, 0 },
268 { X86::CMP32ri8, X86::CMP32mi8, 1, 0 },
269 { X86::CMP32rr, X86::CMP32mr, 1, 0 },
270 { X86::CMP64ri32, X86::CMP64mi32, 1, 0 },
271 { X86::CMP64ri8, X86::CMP64mi8, 1, 0 },
272 { X86::CMP64rr, X86::CMP64mr, 1, 0 },
273 { X86::CMP8ri, X86::CMP8mi, 1, 0 },
274 { X86::CMP8rr, X86::CMP8mr, 1, 0 },
275 { X86::DIV16r, X86::DIV16m, 1, 0 },
276 { X86::DIV32r, X86::DIV32m, 1, 0 },
277 { X86::DIV64r, X86::DIV64m, 1, 0 },
278 { X86::DIV8r, X86::DIV8m, 1, 0 },
279 { X86::EXTRACTPSrr, X86::EXTRACTPSmr, 0, 16 },
280 { X86::FsMOVAPDrr, X86::MOVSDmr | TB_NOT_REVERSABLE , 0, 0 },
281 { X86::FsMOVAPSrr, X86::MOVSSmr | TB_NOT_REVERSABLE , 0, 0 },
282 { X86::IDIV16r, X86::IDIV16m, 1, 0 },
283 { X86::IDIV32r, X86::IDIV32m, 1, 0 },
284 { X86::IDIV64r, X86::IDIV64m, 1, 0 },
285 { X86::IDIV8r, X86::IDIV8m, 1, 0 },
286 { X86::IMUL16r, X86::IMUL16m, 1, 0 },
287 { X86::IMUL32r, X86::IMUL32m, 1, 0 },
288 { X86::IMUL64r, X86::IMUL64m, 1, 0 },
289 { X86::IMUL8r, X86::IMUL8m, 1, 0 },
290 { X86::JMP32r, X86::JMP32m, 1, 0 },
291 { X86::JMP64r, X86::JMP64m, 1, 0 },
292 { X86::MOV16ri, X86::MOV16mi, 0, 0 },
293 { X86::MOV16rr, X86::MOV16mr, 0, 0 },
294 { X86::MOV32ri, X86::MOV32mi, 0, 0 },
295 { X86::MOV32rr, X86::MOV32mr, 0, 0 },
296 { X86::MOV64ri32, X86::MOV64mi32, 0, 0 },
297 { X86::MOV64rr, X86::MOV64mr, 0, 0 },
298 { X86::MOV8ri, X86::MOV8mi, 0, 0 },
299 { X86::MOV8rr, X86::MOV8mr, 0, 0 },
300 { X86::MOV8rr_NOREX, X86::MOV8mr_NOREX, 0, 0 },
301 { X86::MOVAPDrr, X86::MOVAPDmr, 0, 16 },
302 { X86::MOVAPSrr, X86::MOVAPSmr, 0, 16 },
303 { X86::MOVDQArr, X86::MOVDQAmr, 0, 16 },
304 { X86::VMOVAPDYrr, X86::VMOVAPDYmr, 0, 32 },
305 { X86::VMOVAPSYrr, X86::VMOVAPSYmr, 0, 32 },
306 { X86::VMOVDQAYrr, X86::VMOVDQAYmr, 0, 32 },
307 { X86::MOVPDI2DIrr, X86::MOVPDI2DImr, 0, 0 },
308 { X86::MOVPQIto64rr,X86::MOVPQI2QImr, 0, 0 },
309 { X86::MOVSDto64rr, X86::MOVSDto64mr, 0, 0 },
310 { X86::MOVSS2DIrr, X86::MOVSS2DImr, 0, 0 },
311 { X86::MOVUPDrr, X86::MOVUPDmr, 0, 0 },
312 { X86::MOVUPSrr, X86::MOVUPSmr, 0, 0 },
313 { X86::VMOVUPDYrr, X86::VMOVUPDYmr, 0, 0 },
314 { X86::VMOVUPSYrr, X86::VMOVUPSYmr, 0, 0 },
315 { X86::MUL16r, X86::MUL16m, 1, 0 },
316 { X86::MUL32r, X86::MUL32m, 1, 0 },
317 { X86::MUL64r, X86::MUL64m, 1, 0 },
318 { X86::MUL8r, X86::MUL8m, 1, 0 },
319 { X86::SETAEr, X86::SETAEm, 0, 0 },
320 { X86::SETAr, X86::SETAm, 0, 0 },
321 { X86::SETBEr, X86::SETBEm, 0, 0 },
322 { X86::SETBr, X86::SETBm, 0, 0 },
323 { X86::SETEr, X86::SETEm, 0, 0 },
324 { X86::SETGEr, X86::SETGEm, 0, 0 },
325 { X86::SETGr, X86::SETGm, 0, 0 },
326 { X86::SETLEr, X86::SETLEm, 0, 0 },
327 { X86::SETLr, X86::SETLm, 0, 0 },
328 { X86::SETNEr, X86::SETNEm, 0, 0 },
329 { X86::SETNOr, X86::SETNOm, 0, 0 },
330 { X86::SETNPr, X86::SETNPm, 0, 0 },
331 { X86::SETNSr, X86::SETNSm, 0, 0 },
332 { X86::SETOr, X86::SETOm, 0, 0 },
333 { X86::SETPr, X86::SETPm, 0, 0 },
334 { X86::SETSr, X86::SETSm, 0, 0 },
335 { X86::TAILJMPr, X86::TAILJMPm, 1, 0 },
336 { X86::TAILJMPr64, X86::TAILJMPm64, 1, 0 },
337 { X86::TEST16ri, X86::TEST16mi, 1, 0 },
338 { X86::TEST32ri, X86::TEST32mi, 1, 0 },
339 { X86::TEST64ri32, X86::TEST64mi32, 1, 0 },
340 { X86::TEST8ri, X86::TEST8mi, 1, 0 }
343 for (unsigned i = 0, e = array_lengthof(OpTbl0); i != e; ++i) {
344 unsigned RegOp = OpTbl0[i][0];
345 unsigned MemOp = OpTbl0[i][1] & ~TB_FLAGS;
346 unsigned FoldedLoad = OpTbl0[i][2];
347 unsigned Align = OpTbl0[i][3];
348 assert(!RegOp2MemOpTable0.count(RegOp) && "Duplicated entries?");
349 RegOp2MemOpTable0[RegOp] = std::make_pair(MemOp, Align);
351 // If this is not a reversible operation (because there is a many->one)
352 // mapping, don't insert the reverse of the operation into MemOp2RegOpTable.
353 if (OpTbl0[i][1] & TB_NOT_REVERSABLE)
356 // Index 0, folded load or store.
357 unsigned AuxInfo = 0 | (FoldedLoad << 4) | ((FoldedLoad^1) << 5);
358 assert(!MemOp2RegOpTable.count(MemOp) && "Duplicated entries?");
359 MemOp2RegOpTable[MemOp] = std::make_pair(RegOp, AuxInfo);
362 static const unsigned OpTbl1[][3] = {
363 { X86::CMP16rr, X86::CMP16rm, 0 },
364 { X86::CMP32rr, X86::CMP32rm, 0 },
365 { X86::CMP64rr, X86::CMP64rm, 0 },
366 { X86::CMP8rr, X86::CMP8rm, 0 },
367 { X86::CVTSD2SSrr, X86::CVTSD2SSrm, 0 },
368 { X86::CVTSI2SD64rr, X86::CVTSI2SD64rm, 0 },
369 { X86::CVTSI2SDrr, X86::CVTSI2SDrm, 0 },
370 { X86::CVTSI2SS64rr, X86::CVTSI2SS64rm, 0 },
371 { X86::CVTSI2SSrr, X86::CVTSI2SSrm, 0 },
372 { X86::CVTSS2SDrr, X86::CVTSS2SDrm, 0 },
373 { X86::CVTTSD2SI64rr, X86::CVTTSD2SI64rm, 0 },
374 { X86::CVTTSD2SIrr, X86::CVTTSD2SIrm, 0 },
375 { X86::CVTTSS2SI64rr, X86::CVTTSS2SI64rm, 0 },
376 { X86::CVTTSS2SIrr, X86::CVTTSS2SIrm, 0 },
377 { X86::FsMOVAPDrr, X86::MOVSDrm | TB_NOT_REVERSABLE , 0 },
378 { X86::FsMOVAPSrr, X86::MOVSSrm | TB_NOT_REVERSABLE , 0 },
379 { X86::IMUL16rri, X86::IMUL16rmi, 0 },
380 { X86::IMUL16rri8, X86::IMUL16rmi8, 0 },
381 { X86::IMUL32rri, X86::IMUL32rmi, 0 },
382 { X86::IMUL32rri8, X86::IMUL32rmi8, 0 },
383 { X86::IMUL64rri32, X86::IMUL64rmi32, 0 },
384 { X86::IMUL64rri8, X86::IMUL64rmi8, 0 },
385 { X86::Int_COMISDrr, X86::Int_COMISDrm, 0 },
386 { X86::Int_COMISSrr, X86::Int_COMISSrm, 0 },
387 { X86::Int_CVTDQ2PDrr, X86::Int_CVTDQ2PDrm, 16 },
388 { X86::Int_CVTDQ2PSrr, X86::Int_CVTDQ2PSrm, 16 },
389 { X86::Int_CVTPD2DQrr, X86::Int_CVTPD2DQrm, 16 },
390 { X86::Int_CVTPD2PSrr, X86::Int_CVTPD2PSrm, 16 },
391 { X86::Int_CVTPS2DQrr, X86::Int_CVTPS2DQrm, 16 },
392 { X86::Int_CVTPS2PDrr, X86::Int_CVTPS2PDrm, 0 },
393 { X86::CVTSD2SI64rr, X86::CVTSD2SI64rm, 0 },
394 { X86::CVTSD2SIrr, X86::CVTSD2SIrm, 0 },
395 { X86::Int_CVTSD2SSrr, X86::Int_CVTSD2SSrm, 0 },
396 { X86::Int_CVTSI2SD64rr,X86::Int_CVTSI2SD64rm, 0 },
397 { X86::Int_CVTSI2SDrr, X86::Int_CVTSI2SDrm, 0 },
398 { X86::Int_CVTSI2SS64rr,X86::Int_CVTSI2SS64rm, 0 },
399 { X86::Int_CVTSI2SSrr, X86::Int_CVTSI2SSrm, 0 },
400 { X86::Int_CVTSS2SDrr, X86::Int_CVTSS2SDrm, 0 },
401 { X86::Int_CVTSS2SI64rr,X86::Int_CVTSS2SI64rm, 0 },
402 { X86::Int_CVTSS2SIrr, X86::Int_CVTSS2SIrm, 0 },
403 { X86::CVTTPD2DQrr, X86::CVTTPD2DQrm, 16 },
404 { X86::CVTTPS2DQrr, X86::CVTTPS2DQrm, 16 },
405 { X86::Int_CVTTSD2SI64rr,X86::Int_CVTTSD2SI64rm, 0 },
406 { X86::Int_CVTTSD2SIrr, X86::Int_CVTTSD2SIrm, 0 },
407 { X86::Int_CVTTSS2SI64rr,X86::Int_CVTTSS2SI64rm, 0 },
408 { X86::Int_CVTTSS2SIrr, X86::Int_CVTTSS2SIrm, 0 },
409 { X86::Int_UCOMISDrr, X86::Int_UCOMISDrm, 0 },
410 { X86::Int_UCOMISSrr, X86::Int_UCOMISSrm, 0 },
411 { X86::MOV16rr, X86::MOV16rm, 0 },
412 { X86::MOV32rr, X86::MOV32rm, 0 },
413 { X86::MOV64rr, X86::MOV64rm, 0 },
414 { X86::MOV64toPQIrr, X86::MOVQI2PQIrm, 0 },
415 { X86::MOV64toSDrr, X86::MOV64toSDrm, 0 },
416 { X86::MOV8rr, X86::MOV8rm, 0 },
417 { X86::MOVAPDrr, X86::MOVAPDrm, 16 },
418 { X86::MOVAPSrr, X86::MOVAPSrm, 16 },
419 { X86::VMOVAPDYrr, X86::VMOVAPDYrm, 32 },
420 { X86::VMOVAPSYrr, X86::VMOVAPSYrm, 32 },
421 { X86::MOVDDUPrr, X86::MOVDDUPrm, 0 },
422 { X86::MOVDI2PDIrr, X86::MOVDI2PDIrm, 0 },
423 { X86::MOVDI2SSrr, X86::MOVDI2SSrm, 0 },
424 { X86::MOVDQArr, X86::MOVDQArm, 16 },
425 { X86::VMOVDQAYrr, X86::VMOVDQAYrm, 16 },
426 { X86::MOVSHDUPrr, X86::MOVSHDUPrm, 16 },
427 { X86::MOVSLDUPrr, X86::MOVSLDUPrm, 16 },
428 { X86::MOVSX16rr8, X86::MOVSX16rm8, 0 },
429 { X86::MOVSX32rr16, X86::MOVSX32rm16, 0 },
430 { X86::MOVSX32rr8, X86::MOVSX32rm8, 0 },
431 { X86::MOVSX64rr16, X86::MOVSX64rm16, 0 },
432 { X86::MOVSX64rr32, X86::MOVSX64rm32, 0 },
433 { X86::MOVSX64rr8, X86::MOVSX64rm8, 0 },
434 { X86::MOVUPDrr, X86::MOVUPDrm, 16 },
435 { X86::MOVUPSrr, X86::MOVUPSrm, 0 },
436 { X86::VMOVUPDYrr, X86::VMOVUPDYrm, 0 },
437 { X86::VMOVUPSYrr, X86::VMOVUPSYrm, 0 },
438 { X86::MOVZDI2PDIrr, X86::MOVZDI2PDIrm, 0 },
439 { X86::MOVZQI2PQIrr, X86::MOVZQI2PQIrm, 0 },
440 { X86::MOVZPQILo2PQIrr, X86::MOVZPQILo2PQIrm, 16 },
441 { X86::MOVZX16rr8, X86::MOVZX16rm8, 0 },
442 { X86::MOVZX32rr16, X86::MOVZX32rm16, 0 },
443 { X86::MOVZX32_NOREXrr8, X86::MOVZX32_NOREXrm8, 0 },
444 { X86::MOVZX32rr8, X86::MOVZX32rm8, 0 },
445 { X86::MOVZX64rr16, X86::MOVZX64rm16, 0 },
446 { X86::MOVZX64rr32, X86::MOVZX64rm32, 0 },
447 { X86::MOVZX64rr8, X86::MOVZX64rm8, 0 },
448 { X86::PSHUFDri, X86::PSHUFDmi, 16 },
449 { X86::PSHUFHWri, X86::PSHUFHWmi, 16 },
450 { X86::PSHUFLWri, X86::PSHUFLWmi, 16 },
451 { X86::RCPPSr, X86::RCPPSm, 16 },
452 { X86::RCPPSr_Int, X86::RCPPSm_Int, 16 },
453 { X86::RSQRTPSr, X86::RSQRTPSm, 16 },
454 { X86::RSQRTPSr_Int, X86::RSQRTPSm_Int, 16 },
455 { X86::RSQRTSSr, X86::RSQRTSSm, 0 },
456 { X86::RSQRTSSr_Int, X86::RSQRTSSm_Int, 0 },
457 { X86::SQRTPDr, X86::SQRTPDm, 16 },
458 { X86::SQRTPDr_Int, X86::SQRTPDm_Int, 16 },
459 { X86::SQRTPSr, X86::SQRTPSm, 16 },
460 { X86::SQRTPSr_Int, X86::SQRTPSm_Int, 16 },
461 { X86::SQRTSDr, X86::SQRTSDm, 0 },
462 { X86::SQRTSDr_Int, X86::SQRTSDm_Int, 0 },
463 { X86::SQRTSSr, X86::SQRTSSm, 0 },
464 { X86::SQRTSSr_Int, X86::SQRTSSm_Int, 0 },
465 { X86::TEST16rr, X86::TEST16rm, 0 },
466 { X86::TEST32rr, X86::TEST32rm, 0 },
467 { X86::TEST64rr, X86::TEST64rm, 0 },
468 { X86::TEST8rr, X86::TEST8rm, 0 },
469 // FIXME: TEST*rr EAX,EAX ---> CMP [mem], 0
470 { X86::UCOMISDrr, X86::UCOMISDrm, 0 },
471 { X86::UCOMISSrr, X86::UCOMISSrm, 0 }
474 for (unsigned i = 0, e = array_lengthof(OpTbl1); i != e; ++i) {
475 unsigned RegOp = OpTbl1[i][0];
476 unsigned MemOp = OpTbl1[i][1] & ~TB_FLAGS;
477 unsigned Align = OpTbl1[i][2];
478 assert(!RegOp2MemOpTable1.count(RegOp) && "Duplicate entries");
479 RegOp2MemOpTable1[RegOp] = std::make_pair(MemOp, Align);
481 // If this is not a reversible operation (because there is a many->one)
482 // mapping, don't insert the reverse of the operation into MemOp2RegOpTable.
483 if (OpTbl1[i][1] & TB_NOT_REVERSABLE)
486 // Index 1, folded load
487 unsigned AuxInfo = 1 | (1 << 4);
488 assert(!MemOp2RegOpTable.count(MemOp) && "Duplicate entries");
489 MemOp2RegOpTable[MemOp] = std::make_pair(RegOp, AuxInfo);
492 static const unsigned OpTbl2[][3] = {
493 { X86::ADC32rr, X86::ADC32rm, 0 },
494 { X86::ADC64rr, X86::ADC64rm, 0 },
495 { X86::ADD16rr, X86::ADD16rm, 0 },
496 { X86::ADD16rr_DB, X86::ADD16rm | TB_NOT_REVERSABLE, 0 },
497 { X86::ADD32rr, X86::ADD32rm, 0 },
498 { X86::ADD32rr_DB, X86::ADD32rm | TB_NOT_REVERSABLE, 0 },
499 { X86::ADD64rr, X86::ADD64rm, 0 },
500 { X86::ADD64rr_DB, X86::ADD64rm | TB_NOT_REVERSABLE, 0 },
501 { X86::ADD8rr, X86::ADD8rm, 0 },
502 { X86::ADDPDrr, X86::ADDPDrm, 16 },
503 { X86::ADDPSrr, X86::ADDPSrm, 16 },
504 { X86::ADDSDrr, X86::ADDSDrm, 0 },
505 { X86::ADDSSrr, X86::ADDSSrm, 0 },
506 { X86::ADDSUBPDrr, X86::ADDSUBPDrm, 16 },
507 { X86::ADDSUBPSrr, X86::ADDSUBPSrm, 16 },
508 { X86::AND16rr, X86::AND16rm, 0 },
509 { X86::AND32rr, X86::AND32rm, 0 },
510 { X86::AND64rr, X86::AND64rm, 0 },
511 { X86::AND8rr, X86::AND8rm, 0 },
512 { X86::ANDNPDrr, X86::ANDNPDrm, 16 },
513 { X86::ANDNPSrr, X86::ANDNPSrm, 16 },
514 { X86::ANDPDrr, X86::ANDPDrm, 16 },
515 { X86::ANDPSrr, X86::ANDPSrm, 16 },
516 { X86::CMOVA16rr, X86::CMOVA16rm, 0 },
517 { X86::CMOVA32rr, X86::CMOVA32rm, 0 },
518 { X86::CMOVA64rr, X86::CMOVA64rm, 0 },
519 { X86::CMOVAE16rr, X86::CMOVAE16rm, 0 },
520 { X86::CMOVAE32rr, X86::CMOVAE32rm, 0 },
521 { X86::CMOVAE64rr, X86::CMOVAE64rm, 0 },
522 { X86::CMOVB16rr, X86::CMOVB16rm, 0 },
523 { X86::CMOVB32rr, X86::CMOVB32rm, 0 },
524 { X86::CMOVB64rr, X86::CMOVB64rm, 0 },
525 { X86::CMOVBE16rr, X86::CMOVBE16rm, 0 },
526 { X86::CMOVBE32rr, X86::CMOVBE32rm, 0 },
527 { X86::CMOVBE64rr, X86::CMOVBE64rm, 0 },
528 { X86::CMOVE16rr, X86::CMOVE16rm, 0 },
529 { X86::CMOVE32rr, X86::CMOVE32rm, 0 },
530 { X86::CMOVE64rr, X86::CMOVE64rm, 0 },
531 { X86::CMOVG16rr, X86::CMOVG16rm, 0 },
532 { X86::CMOVG32rr, X86::CMOVG32rm, 0 },
533 { X86::CMOVG64rr, X86::CMOVG64rm, 0 },
534 { X86::CMOVGE16rr, X86::CMOVGE16rm, 0 },
535 { X86::CMOVGE32rr, X86::CMOVGE32rm, 0 },
536 { X86::CMOVGE64rr, X86::CMOVGE64rm, 0 },
537 { X86::CMOVL16rr, X86::CMOVL16rm, 0 },
538 { X86::CMOVL32rr, X86::CMOVL32rm, 0 },
539 { X86::CMOVL64rr, X86::CMOVL64rm, 0 },
540 { X86::CMOVLE16rr, X86::CMOVLE16rm, 0 },
541 { X86::CMOVLE32rr, X86::CMOVLE32rm, 0 },
542 { X86::CMOVLE64rr, X86::CMOVLE64rm, 0 },
543 { X86::CMOVNE16rr, X86::CMOVNE16rm, 0 },
544 { X86::CMOVNE32rr, X86::CMOVNE32rm, 0 },
545 { X86::CMOVNE64rr, X86::CMOVNE64rm, 0 },
546 { X86::CMOVNO16rr, X86::CMOVNO16rm, 0 },
547 { X86::CMOVNO32rr, X86::CMOVNO32rm, 0 },
548 { X86::CMOVNO64rr, X86::CMOVNO64rm, 0 },
549 { X86::CMOVNP16rr, X86::CMOVNP16rm, 0 },
550 { X86::CMOVNP32rr, X86::CMOVNP32rm, 0 },
551 { X86::CMOVNP64rr, X86::CMOVNP64rm, 0 },
552 { X86::CMOVNS16rr, X86::CMOVNS16rm, 0 },
553 { X86::CMOVNS32rr, X86::CMOVNS32rm, 0 },
554 { X86::CMOVNS64rr, X86::CMOVNS64rm, 0 },
555 { X86::CMOVO16rr, X86::CMOVO16rm, 0 },
556 { X86::CMOVO32rr, X86::CMOVO32rm, 0 },
557 { X86::CMOVO64rr, X86::CMOVO64rm, 0 },
558 { X86::CMOVP16rr, X86::CMOVP16rm, 0 },
559 { X86::CMOVP32rr, X86::CMOVP32rm, 0 },
560 { X86::CMOVP64rr, X86::CMOVP64rm, 0 },
561 { X86::CMOVS16rr, X86::CMOVS16rm, 0 },
562 { X86::CMOVS32rr, X86::CMOVS32rm, 0 },
563 { X86::CMOVS64rr, X86::CMOVS64rm, 0 },
564 { X86::CMPPDrri, X86::CMPPDrmi, 16 },
565 { X86::CMPPSrri, X86::CMPPSrmi, 16 },
566 { X86::CMPSDrr, X86::CMPSDrm, 0 },
567 { X86::CMPSSrr, X86::CMPSSrm, 0 },
568 { X86::DIVPDrr, X86::DIVPDrm, 16 },
569 { X86::DIVPSrr, X86::DIVPSrm, 16 },
570 { X86::DIVSDrr, X86::DIVSDrm, 0 },
571 { X86::DIVSSrr, X86::DIVSSrm, 0 },
572 { X86::FsANDNPDrr, X86::FsANDNPDrm, 16 },
573 { X86::FsANDNPSrr, X86::FsANDNPSrm, 16 },
574 { X86::FsANDPDrr, X86::FsANDPDrm, 16 },
575 { X86::FsANDPSrr, X86::FsANDPSrm, 16 },
576 { X86::FsORPDrr, X86::FsORPDrm, 16 },
577 { X86::FsORPSrr, X86::FsORPSrm, 16 },
578 { X86::FsXORPDrr, X86::FsXORPDrm, 16 },
579 { X86::FsXORPSrr, X86::FsXORPSrm, 16 },
580 { X86::HADDPDrr, X86::HADDPDrm, 16 },
581 { X86::HADDPSrr, X86::HADDPSrm, 16 },
582 { X86::HSUBPDrr, X86::HSUBPDrm, 16 },
583 { X86::HSUBPSrr, X86::HSUBPSrm, 16 },
584 { X86::IMUL16rr, X86::IMUL16rm, 0 },
585 { X86::IMUL32rr, X86::IMUL32rm, 0 },
586 { X86::IMUL64rr, X86::IMUL64rm, 0 },
587 { X86::Int_CMPSDrr, X86::Int_CMPSDrm, 0 },
588 { X86::Int_CMPSSrr, X86::Int_CMPSSrm, 0 },
589 { X86::MAXPDrr, X86::MAXPDrm, 16 },
590 { X86::MAXPDrr_Int, X86::MAXPDrm_Int, 16 },
591 { X86::MAXPSrr, X86::MAXPSrm, 16 },
592 { X86::MAXPSrr_Int, X86::MAXPSrm_Int, 16 },
593 { X86::MAXSDrr, X86::MAXSDrm, 0 },
594 { X86::MAXSDrr_Int, X86::MAXSDrm_Int, 0 },
595 { X86::MAXSSrr, X86::MAXSSrm, 0 },
596 { X86::MAXSSrr_Int, X86::MAXSSrm_Int, 0 },
597 { X86::MINPDrr, X86::MINPDrm, 16 },
598 { X86::MINPDrr_Int, X86::MINPDrm_Int, 16 },
599 { X86::MINPSrr, X86::MINPSrm, 16 },
600 { X86::MINPSrr_Int, X86::MINPSrm_Int, 16 },
601 { X86::MINSDrr, X86::MINSDrm, 0 },
602 { X86::MINSDrr_Int, X86::MINSDrm_Int, 0 },
603 { X86::MINSSrr, X86::MINSSrm, 0 },
604 { X86::MINSSrr_Int, X86::MINSSrm_Int, 0 },
605 { X86::MULPDrr, X86::MULPDrm, 16 },
606 { X86::MULPSrr, X86::MULPSrm, 16 },
607 { X86::MULSDrr, X86::MULSDrm, 0 },
608 { X86::MULSSrr, X86::MULSSrm, 0 },
609 { X86::OR16rr, X86::OR16rm, 0 },
610 { X86::OR32rr, X86::OR32rm, 0 },
611 { X86::OR64rr, X86::OR64rm, 0 },
612 { X86::OR8rr, X86::OR8rm, 0 },
613 { X86::ORPDrr, X86::ORPDrm, 16 },
614 { X86::ORPSrr, X86::ORPSrm, 16 },
615 { X86::PACKSSDWrr, X86::PACKSSDWrm, 16 },
616 { X86::PACKSSWBrr, X86::PACKSSWBrm, 16 },
617 { X86::PACKUSWBrr, X86::PACKUSWBrm, 16 },
618 { X86::PADDBrr, X86::PADDBrm, 16 },
619 { X86::PADDDrr, X86::PADDDrm, 16 },
620 { X86::PADDQrr, X86::PADDQrm, 16 },
621 { X86::PADDSBrr, X86::PADDSBrm, 16 },
622 { X86::PADDSWrr, X86::PADDSWrm, 16 },
623 { X86::PADDWrr, X86::PADDWrm, 16 },
624 { X86::PANDNrr, X86::PANDNrm, 16 },
625 { X86::PANDrr, X86::PANDrm, 16 },
626 { X86::PAVGBrr, X86::PAVGBrm, 16 },
627 { X86::PAVGWrr, X86::PAVGWrm, 16 },
628 { X86::PCMPEQBrr, X86::PCMPEQBrm, 16 },
629 { X86::PCMPEQDrr, X86::PCMPEQDrm, 16 },
630 { X86::PCMPEQWrr, X86::PCMPEQWrm, 16 },
631 { X86::PCMPGTBrr, X86::PCMPGTBrm, 16 },
632 { X86::PCMPGTDrr, X86::PCMPGTDrm, 16 },
633 { X86::PCMPGTWrr, X86::PCMPGTWrm, 16 },
634 { X86::PINSRWrri, X86::PINSRWrmi, 16 },
635 { X86::PMADDWDrr, X86::PMADDWDrm, 16 },
636 { X86::PMAXSWrr, X86::PMAXSWrm, 16 },
637 { X86::PMAXUBrr, X86::PMAXUBrm, 16 },
638 { X86::PMINSWrr, X86::PMINSWrm, 16 },
639 { X86::PMINUBrr, X86::PMINUBrm, 16 },
640 { X86::PMULDQrr, X86::PMULDQrm, 16 },
641 { X86::PMULHUWrr, X86::PMULHUWrm, 16 },
642 { X86::PMULHWrr, X86::PMULHWrm, 16 },
643 { X86::PMULLDrr, X86::PMULLDrm, 16 },
644 { X86::PMULLWrr, X86::PMULLWrm, 16 },
645 { X86::PMULUDQrr, X86::PMULUDQrm, 16 },
646 { X86::PORrr, X86::PORrm, 16 },
647 { X86::PSADBWrr, X86::PSADBWrm, 16 },
648 { X86::PSLLDrr, X86::PSLLDrm, 16 },
649 { X86::PSLLQrr, X86::PSLLQrm, 16 },
650 { X86::PSLLWrr, X86::PSLLWrm, 16 },
651 { X86::PSRADrr, X86::PSRADrm, 16 },
652 { X86::PSRAWrr, X86::PSRAWrm, 16 },
653 { X86::PSRLDrr, X86::PSRLDrm, 16 },
654 { X86::PSRLQrr, X86::PSRLQrm, 16 },
655 { X86::PSRLWrr, X86::PSRLWrm, 16 },
656 { X86::PSUBBrr, X86::PSUBBrm, 16 },
657 { X86::PSUBDrr, X86::PSUBDrm, 16 },
658 { X86::PSUBSBrr, X86::PSUBSBrm, 16 },
659 { X86::PSUBSWrr, X86::PSUBSWrm, 16 },
660 { X86::PSUBWrr, X86::PSUBWrm, 16 },
661 { X86::PUNPCKHBWrr, X86::PUNPCKHBWrm, 16 },
662 { X86::PUNPCKHDQrr, X86::PUNPCKHDQrm, 16 },
663 { X86::PUNPCKHQDQrr, X86::PUNPCKHQDQrm, 16 },
664 { X86::PUNPCKHWDrr, X86::PUNPCKHWDrm, 16 },
665 { X86::PUNPCKLBWrr, X86::PUNPCKLBWrm, 16 },
666 { X86::PUNPCKLDQrr, X86::PUNPCKLDQrm, 16 },
667 { X86::PUNPCKLQDQrr, X86::PUNPCKLQDQrm, 16 },
668 { X86::PUNPCKLWDrr, X86::PUNPCKLWDrm, 16 },
669 { X86::PXORrr, X86::PXORrm, 16 },
670 { X86::SBB32rr, X86::SBB32rm, 0 },
671 { X86::SBB64rr, X86::SBB64rm, 0 },
672 { X86::SHUFPDrri, X86::SHUFPDrmi, 16 },
673 { X86::SHUFPSrri, X86::SHUFPSrmi, 16 },
674 { X86::SUB16rr, X86::SUB16rm, 0 },
675 { X86::SUB32rr, X86::SUB32rm, 0 },
676 { X86::SUB64rr, X86::SUB64rm, 0 },
677 { X86::SUB8rr, X86::SUB8rm, 0 },
678 { X86::SUBPDrr, X86::SUBPDrm, 16 },
679 { X86::SUBPSrr, X86::SUBPSrm, 16 },
680 { X86::SUBSDrr, X86::SUBSDrm, 0 },
681 { X86::SUBSSrr, X86::SUBSSrm, 0 },
682 // FIXME: TEST*rr -> swapped operand of TEST*mr.
683 { X86::UNPCKHPDrr, X86::UNPCKHPDrm, 16 },
684 { X86::UNPCKHPSrr, X86::UNPCKHPSrm, 16 },
685 { X86::UNPCKLPDrr, X86::UNPCKLPDrm, 16 },
686 { X86::UNPCKLPSrr, X86::UNPCKLPSrm, 16 },
687 { X86::XOR16rr, X86::XOR16rm, 0 },
688 { X86::XOR32rr, X86::XOR32rm, 0 },
689 { X86::XOR64rr, X86::XOR64rm, 0 },
690 { X86::XOR8rr, X86::XOR8rm, 0 },
691 { X86::XORPDrr, X86::XORPDrm, 16 },
692 { X86::XORPSrr, X86::XORPSrm, 16 }
695 for (unsigned i = 0, e = array_lengthof(OpTbl2); i != e; ++i) {
696 unsigned RegOp = OpTbl2[i][0];
697 unsigned MemOp = OpTbl2[i][1] & ~TB_FLAGS;
698 unsigned Align = OpTbl2[i][2];
700 assert(!RegOp2MemOpTable2.count(RegOp) && "Duplicate entry!");
701 RegOp2MemOpTable2[RegOp] = std::make_pair(MemOp, Align);
703 // If this is not a reversible operation (because there is a many->one)
704 // mapping, don't insert the reverse of the operation into MemOp2RegOpTable.
705 if (OpTbl2[i][1] & TB_NOT_REVERSABLE)
708 // Index 2, folded load
709 unsigned AuxInfo = 2 | (1 << 4);
710 assert(!MemOp2RegOpTable.count(MemOp) &&
711 "Duplicated entries in unfolding maps?");
712 MemOp2RegOpTable[MemOp] = std::make_pair(RegOp, AuxInfo);
717 X86InstrInfo::isCoalescableExtInstr(const MachineInstr &MI,
718 unsigned &SrcReg, unsigned &DstReg,
719 unsigned &SubIdx) const {
720 switch (MI.getOpcode()) {
722 case X86::MOVSX16rr8:
723 case X86::MOVZX16rr8:
724 case X86::MOVSX32rr8:
725 case X86::MOVZX32rr8:
726 case X86::MOVSX64rr8:
727 case X86::MOVZX64rr8:
728 if (!TM.getSubtarget<X86Subtarget>().is64Bit())
729 // It's not always legal to reference the low 8-bit of the larger
730 // register in 32-bit mode.
732 case X86::MOVSX32rr16:
733 case X86::MOVZX32rr16:
734 case X86::MOVSX64rr16:
735 case X86::MOVZX64rr16:
736 case X86::MOVSX64rr32:
737 case X86::MOVZX64rr32: {
738 if (MI.getOperand(0).getSubReg() || MI.getOperand(1).getSubReg())
741 SrcReg = MI.getOperand(1).getReg();
742 DstReg = MI.getOperand(0).getReg();
743 switch (MI.getOpcode()) {
747 case X86::MOVSX16rr8:
748 case X86::MOVZX16rr8:
749 case X86::MOVSX32rr8:
750 case X86::MOVZX32rr8:
751 case X86::MOVSX64rr8:
752 case X86::MOVZX64rr8:
753 SubIdx = X86::sub_8bit;
755 case X86::MOVSX32rr16:
756 case X86::MOVZX32rr16:
757 case X86::MOVSX64rr16:
758 case X86::MOVZX64rr16:
759 SubIdx = X86::sub_16bit;
761 case X86::MOVSX64rr32:
762 case X86::MOVZX64rr32:
763 SubIdx = X86::sub_32bit;
772 /// isFrameOperand - Return true and the FrameIndex if the specified
773 /// operand and follow operands form a reference to the stack frame.
774 bool X86InstrInfo::isFrameOperand(const MachineInstr *MI, unsigned int Op,
775 int &FrameIndex) const {
776 if (MI->getOperand(Op).isFI() && MI->getOperand(Op+1).isImm() &&
777 MI->getOperand(Op+2).isReg() && MI->getOperand(Op+3).isImm() &&
778 MI->getOperand(Op+1).getImm() == 1 &&
779 MI->getOperand(Op+2).getReg() == 0 &&
780 MI->getOperand(Op+3).getImm() == 0) {
781 FrameIndex = MI->getOperand(Op).getIndex();
787 static bool isFrameLoadOpcode(int Opcode) {
800 case X86::VMOVAPSYrm:
801 case X86::VMOVAPDYrm:
802 case X86::VMOVDQAYrm:
803 case X86::MMX_MOVD64rm:
804 case X86::MMX_MOVQ64rm:
811 static bool isFrameStoreOpcode(int Opcode) {
824 case X86::VMOVAPSYmr:
825 case X86::VMOVAPDYmr:
826 case X86::VMOVDQAYmr:
827 case X86::MMX_MOVD64mr:
828 case X86::MMX_MOVQ64mr:
829 case X86::MMX_MOVNTQmr:
835 unsigned X86InstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
836 int &FrameIndex) const {
837 if (isFrameLoadOpcode(MI->getOpcode()))
838 if (MI->getOperand(0).getSubReg() == 0 && isFrameOperand(MI, 1, FrameIndex))
839 return MI->getOperand(0).getReg();
843 unsigned X86InstrInfo::isLoadFromStackSlotPostFE(const MachineInstr *MI,
844 int &FrameIndex) const {
845 if (isFrameLoadOpcode(MI->getOpcode())) {
847 if ((Reg = isLoadFromStackSlot(MI, FrameIndex)))
849 // Check for post-frame index elimination operations
850 const MachineMemOperand *Dummy;
851 return hasLoadFromStackSlot(MI, Dummy, FrameIndex);
856 bool X86InstrInfo::hasLoadFromStackSlot(const MachineInstr *MI,
857 const MachineMemOperand *&MMO,
858 int &FrameIndex) const {
859 for (MachineInstr::mmo_iterator o = MI->memoperands_begin(),
860 oe = MI->memoperands_end();
863 if ((*o)->isLoad() && (*o)->getValue())
864 if (const FixedStackPseudoSourceValue *Value =
865 dyn_cast<const FixedStackPseudoSourceValue>((*o)->getValue())) {
866 FrameIndex = Value->getFrameIndex();
874 unsigned X86InstrInfo::isStoreToStackSlot(const MachineInstr *MI,
875 int &FrameIndex) const {
876 if (isFrameStoreOpcode(MI->getOpcode()))
877 if (MI->getOperand(X86::AddrNumOperands).getSubReg() == 0 &&
878 isFrameOperand(MI, 0, FrameIndex))
879 return MI->getOperand(X86::AddrNumOperands).getReg();
883 unsigned X86InstrInfo::isStoreToStackSlotPostFE(const MachineInstr *MI,
884 int &FrameIndex) const {
885 if (isFrameStoreOpcode(MI->getOpcode())) {
887 if ((Reg = isStoreToStackSlot(MI, FrameIndex)))
889 // Check for post-frame index elimination operations
890 const MachineMemOperand *Dummy;
891 return hasStoreToStackSlot(MI, Dummy, FrameIndex);
896 bool X86InstrInfo::hasStoreToStackSlot(const MachineInstr *MI,
897 const MachineMemOperand *&MMO,
898 int &FrameIndex) const {
899 for (MachineInstr::mmo_iterator o = MI->memoperands_begin(),
900 oe = MI->memoperands_end();
903 if ((*o)->isStore() && (*o)->getValue())
904 if (const FixedStackPseudoSourceValue *Value =
905 dyn_cast<const FixedStackPseudoSourceValue>((*o)->getValue())) {
906 FrameIndex = Value->getFrameIndex();
914 /// regIsPICBase - Return true if register is PIC base (i.e.g defined by
916 static bool regIsPICBase(unsigned BaseReg, const MachineRegisterInfo &MRI) {
917 bool isPICBase = false;
918 for (MachineRegisterInfo::def_iterator I = MRI.def_begin(BaseReg),
919 E = MRI.def_end(); I != E; ++I) {
920 MachineInstr *DefMI = I.getOperand().getParent();
921 if (DefMI->getOpcode() != X86::MOVPC32r)
923 assert(!isPICBase && "More than one PIC base?");
930 X86InstrInfo::isReallyTriviallyReMaterializable(const MachineInstr *MI,
931 AliasAnalysis *AA) const {
932 switch (MI->getOpcode()) {
945 case X86::VMOVAPSYrm:
946 case X86::VMOVUPSYrm:
947 case X86::VMOVAPDYrm:
948 case X86::VMOVDQAYrm:
949 case X86::MMX_MOVD64rm:
950 case X86::MMX_MOVQ64rm:
951 case X86::FsMOVAPSrm:
952 case X86::FsMOVAPDrm: {
953 // Loads from constant pools are trivially rematerializable.
954 if (MI->getOperand(1).isReg() &&
955 MI->getOperand(2).isImm() &&
956 MI->getOperand(3).isReg() && MI->getOperand(3).getReg() == 0 &&
957 MI->isInvariantLoad(AA)) {
958 unsigned BaseReg = MI->getOperand(1).getReg();
959 if (BaseReg == 0 || BaseReg == X86::RIP)
961 // Allow re-materialization of PIC load.
962 if (!ReMatPICStubLoad && MI->getOperand(4).isGlobal())
964 const MachineFunction &MF = *MI->getParent()->getParent();
965 const MachineRegisterInfo &MRI = MF.getRegInfo();
966 bool isPICBase = false;
967 for (MachineRegisterInfo::def_iterator I = MRI.def_begin(BaseReg),
968 E = MRI.def_end(); I != E; ++I) {
969 MachineInstr *DefMI = I.getOperand().getParent();
970 if (DefMI->getOpcode() != X86::MOVPC32r)
972 assert(!isPICBase && "More than one PIC base?");
982 if (MI->getOperand(2).isImm() &&
983 MI->getOperand(3).isReg() && MI->getOperand(3).getReg() == 0 &&
984 !MI->getOperand(4).isReg()) {
985 // lea fi#, lea GV, etc. are all rematerializable.
986 if (!MI->getOperand(1).isReg())
988 unsigned BaseReg = MI->getOperand(1).getReg();
991 // Allow re-materialization of lea PICBase + x.
992 const MachineFunction &MF = *MI->getParent()->getParent();
993 const MachineRegisterInfo &MRI = MF.getRegInfo();
994 return regIsPICBase(BaseReg, MRI);
1000 // All other instructions marked M_REMATERIALIZABLE are always trivially
1001 // rematerializable.
1005 /// isSafeToClobberEFLAGS - Return true if it's safe insert an instruction that
1006 /// would clobber the EFLAGS condition register. Note the result may be
1007 /// conservative. If it cannot definitely determine the safety after visiting
1008 /// a few instructions in each direction it assumes it's not safe.
1009 static bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
1010 MachineBasicBlock::iterator I) {
1011 MachineBasicBlock::iterator E = MBB.end();
1013 // It's always safe to clobber EFLAGS at the end of a block.
1017 // For compile time consideration, if we are not able to determine the
1018 // safety after visiting 4 instructions in each direction, we will assume
1020 MachineBasicBlock::iterator Iter = I;
1021 for (unsigned i = 0; i < 4; ++i) {
1022 bool SeenDef = false;
1023 for (unsigned j = 0, e = Iter->getNumOperands(); j != e; ++j) {
1024 MachineOperand &MO = Iter->getOperand(j);
1027 if (MO.getReg() == X86::EFLAGS) {
1035 // This instruction defines EFLAGS, no need to look any further.
1038 // Skip over DBG_VALUE.
1039 while (Iter != E && Iter->isDebugValue())
1042 // If we make it to the end of the block, it's safe to clobber EFLAGS.
1047 MachineBasicBlock::iterator B = MBB.begin();
1049 for (unsigned i = 0; i < 4; ++i) {
1050 // If we make it to the beginning of the block, it's safe to clobber
1051 // EFLAGS iff EFLAGS is not live-in.
1053 return !MBB.isLiveIn(X86::EFLAGS);
1056 // Skip over DBG_VALUE.
1057 while (Iter != B && Iter->isDebugValue())
1060 bool SawKill = false;
1061 for (unsigned j = 0, e = Iter->getNumOperands(); j != e; ++j) {
1062 MachineOperand &MO = Iter->getOperand(j);
1063 if (MO.isReg() && MO.getReg() == X86::EFLAGS) {
1064 if (MO.isDef()) return MO.isDead();
1065 if (MO.isKill()) SawKill = true;
1070 // This instruction kills EFLAGS and doesn't redefine it, so
1071 // there's no need to look further.
1075 // Conservative answer.
1079 void X86InstrInfo::reMaterialize(MachineBasicBlock &MBB,
1080 MachineBasicBlock::iterator I,
1081 unsigned DestReg, unsigned SubIdx,
1082 const MachineInstr *Orig,
1083 const TargetRegisterInfo &TRI) const {
1084 DebugLoc DL = Orig->getDebugLoc();
1086 // MOV32r0 etc. are implemented with xor which clobbers condition code.
1087 // Re-materialize them as movri instructions to avoid side effects.
1089 unsigned Opc = Orig->getOpcode();
1095 case X86::MOV64r0: {
1096 if (!isSafeToClobberEFLAGS(MBB, I)) {
1099 case X86::MOV8r0: Opc = X86::MOV8ri; break;
1100 case X86::MOV16r0: Opc = X86::MOV16ri; break;
1101 case X86::MOV32r0: Opc = X86::MOV32ri; break;
1102 case X86::MOV64r0: Opc = X86::MOV64ri64i32; break;
1111 MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
1114 BuildMI(MBB, I, DL, get(Opc)).addOperand(Orig->getOperand(0)).addImm(0);
1117 MachineInstr *NewMI = prior(I);
1118 NewMI->substituteRegister(Orig->getOperand(0).getReg(), DestReg, SubIdx, TRI);
1121 /// hasLiveCondCodeDef - True if MI has a condition code def, e.g. EFLAGS, that
1122 /// is not marked dead.
1123 static bool hasLiveCondCodeDef(MachineInstr *MI) {
1124 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
1125 MachineOperand &MO = MI->getOperand(i);
1126 if (MO.isReg() && MO.isDef() &&
1127 MO.getReg() == X86::EFLAGS && !MO.isDead()) {
1134 /// convertToThreeAddressWithLEA - Helper for convertToThreeAddress when
1135 /// 16-bit LEA is disabled, use 32-bit LEA to form 3-address code by promoting
1136 /// to a 32-bit superregister and then truncating back down to a 16-bit
1139 X86InstrInfo::convertToThreeAddressWithLEA(unsigned MIOpc,
1140 MachineFunction::iterator &MFI,
1141 MachineBasicBlock::iterator &MBBI,
1142 LiveVariables *LV) const {
1143 MachineInstr *MI = MBBI;
1144 unsigned Dest = MI->getOperand(0).getReg();
1145 unsigned Src = MI->getOperand(1).getReg();
1146 bool isDead = MI->getOperand(0).isDead();
1147 bool isKill = MI->getOperand(1).isKill();
1149 unsigned Opc = TM.getSubtarget<X86Subtarget>().is64Bit()
1150 ? X86::LEA64_32r : X86::LEA32r;
1151 MachineRegisterInfo &RegInfo = MFI->getParent()->getRegInfo();
1152 unsigned leaInReg = RegInfo.createVirtualRegister(&X86::GR32_NOSPRegClass);
1153 unsigned leaOutReg = RegInfo.createVirtualRegister(&X86::GR32RegClass);
1155 // Build and insert into an implicit UNDEF value. This is OK because
1156 // well be shifting and then extracting the lower 16-bits.
1157 // This has the potential to cause partial register stall. e.g.
1158 // movw (%rbp,%rcx,2), %dx
1159 // leal -65(%rdx), %esi
1160 // But testing has shown this *does* help performance in 64-bit mode (at
1161 // least on modern x86 machines).
1162 BuildMI(*MFI, MBBI, MI->getDebugLoc(), get(X86::IMPLICIT_DEF), leaInReg);
1163 MachineInstr *InsMI =
1164 BuildMI(*MFI, MBBI, MI->getDebugLoc(), get(TargetOpcode::COPY))
1165 .addReg(leaInReg, RegState::Define, X86::sub_16bit)
1166 .addReg(Src, getKillRegState(isKill));
1168 MachineInstrBuilder MIB = BuildMI(*MFI, MBBI, MI->getDebugLoc(),
1169 get(Opc), leaOutReg);
1172 llvm_unreachable(0);
1174 case X86::SHL16ri: {
1175 unsigned ShAmt = MI->getOperand(2).getImm();
1176 MIB.addReg(0).addImm(1 << ShAmt)
1177 .addReg(leaInReg, RegState::Kill).addImm(0).addReg(0);
1181 case X86::INC64_16r:
1182 addRegOffset(MIB, leaInReg, true, 1);
1185 case X86::DEC64_16r:
1186 addRegOffset(MIB, leaInReg, true, -1);
1190 case X86::ADD16ri_DB:
1191 case X86::ADD16ri8_DB:
1192 addRegOffset(MIB, leaInReg, true, MI->getOperand(2).getImm());
1195 case X86::ADD16rr_DB: {
1196 unsigned Src2 = MI->getOperand(2).getReg();
1197 bool isKill2 = MI->getOperand(2).isKill();
1198 unsigned leaInReg2 = 0;
1199 MachineInstr *InsMI2 = 0;
1201 // ADD16rr %reg1028<kill>, %reg1028
1202 // just a single insert_subreg.
1203 addRegReg(MIB, leaInReg, true, leaInReg, false);
1205 leaInReg2 = RegInfo.createVirtualRegister(&X86::GR32_NOSPRegClass);
1206 // Build and insert into an implicit UNDEF value. This is OK because
1207 // well be shifting and then extracting the lower 16-bits.
1208 BuildMI(*MFI, MIB, MI->getDebugLoc(), get(X86::IMPLICIT_DEF), leaInReg2);
1210 BuildMI(*MFI, MIB, MI->getDebugLoc(), get(TargetOpcode::COPY))
1211 .addReg(leaInReg2, RegState::Define, X86::sub_16bit)
1212 .addReg(Src2, getKillRegState(isKill2));
1213 addRegReg(MIB, leaInReg, true, leaInReg2, true);
1215 if (LV && isKill2 && InsMI2)
1216 LV->replaceKillInstruction(Src2, MI, InsMI2);
1221 MachineInstr *NewMI = MIB;
1222 MachineInstr *ExtMI =
1223 BuildMI(*MFI, MBBI, MI->getDebugLoc(), get(TargetOpcode::COPY))
1224 .addReg(Dest, RegState::Define | getDeadRegState(isDead))
1225 .addReg(leaOutReg, RegState::Kill, X86::sub_16bit);
1228 // Update live variables
1229 LV->getVarInfo(leaInReg).Kills.push_back(NewMI);
1230 LV->getVarInfo(leaOutReg).Kills.push_back(ExtMI);
1232 LV->replaceKillInstruction(Src, MI, InsMI);
1234 LV->replaceKillInstruction(Dest, MI, ExtMI);
1240 /// convertToThreeAddress - This method must be implemented by targets that
1241 /// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
1242 /// may be able to convert a two-address instruction into a true
1243 /// three-address instruction on demand. This allows the X86 target (for
1244 /// example) to convert ADD and SHL instructions into LEA instructions if they
1245 /// would require register copies due to two-addressness.
1247 /// This method returns a null pointer if the transformation cannot be
1248 /// performed, otherwise it returns the new instruction.
1251 X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
1252 MachineBasicBlock::iterator &MBBI,
1253 LiveVariables *LV) const {
1254 MachineInstr *MI = MBBI;
1255 MachineFunction &MF = *MI->getParent()->getParent();
1256 // All instructions input are two-addr instructions. Get the known operands.
1257 unsigned Dest = MI->getOperand(0).getReg();
1258 unsigned Src = MI->getOperand(1).getReg();
1259 bool isDead = MI->getOperand(0).isDead();
1260 bool isKill = MI->getOperand(1).isKill();
1262 MachineInstr *NewMI = NULL;
1263 // FIXME: 16-bit LEA's are really slow on Athlons, but not bad on P4's. When
1264 // we have better subtarget support, enable the 16-bit LEA generation here.
1265 // 16-bit LEA is also slow on Core2.
1266 bool DisableLEA16 = true;
1267 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
1269 unsigned MIOpc = MI->getOpcode();
1271 case X86::SHUFPSrri: {
1272 assert(MI->getNumOperands() == 4 && "Unknown shufps instruction!");
1273 if (!TM.getSubtarget<X86Subtarget>().hasSSE2()) return 0;
1275 unsigned B = MI->getOperand(1).getReg();
1276 unsigned C = MI->getOperand(2).getReg();
1277 if (B != C) return 0;
1278 unsigned A = MI->getOperand(0).getReg();
1279 unsigned M = MI->getOperand(3).getImm();
1280 NewMI = BuildMI(MF, MI->getDebugLoc(), get(X86::PSHUFDri))
1281 .addReg(A, RegState::Define | getDeadRegState(isDead))
1282 .addReg(B, getKillRegState(isKill)).addImm(M);
1285 case X86::SHL64ri: {
1286 assert(MI->getNumOperands() >= 3 && "Unknown shift instruction!");
1287 // NOTE: LEA doesn't produce flags like shift does, but LLVM never uses
1288 // the flags produced by a shift yet, so this is safe.
1289 unsigned ShAmt = MI->getOperand(2).getImm();
1290 if (ShAmt == 0 || ShAmt >= 4) return 0;
1292 // LEA can't handle RSP.
1293 if (TargetRegisterInfo::isVirtualRegister(Src) &&
1294 !MF.getRegInfo().constrainRegClass(Src, &X86::GR64_NOSPRegClass))
1297 NewMI = BuildMI(MF, MI->getDebugLoc(), get(X86::LEA64r))
1298 .addReg(Dest, RegState::Define | getDeadRegState(isDead))
1299 .addReg(0).addImm(1 << ShAmt)
1300 .addReg(Src, getKillRegState(isKill))
1301 .addImm(0).addReg(0);
1304 case X86::SHL32ri: {
1305 assert(MI->getNumOperands() >= 3 && "Unknown shift instruction!");
1306 // NOTE: LEA doesn't produce flags like shift does, but LLVM never uses
1307 // the flags produced by a shift yet, so this is safe.
1308 unsigned ShAmt = MI->getOperand(2).getImm();
1309 if (ShAmt == 0 || ShAmt >= 4) return 0;
1311 // LEA can't handle ESP.
1312 if (TargetRegisterInfo::isVirtualRegister(Src) &&
1313 !MF.getRegInfo().constrainRegClass(Src, &X86::GR32_NOSPRegClass))
1316 unsigned Opc = is64Bit ? X86::LEA64_32r : X86::LEA32r;
1317 NewMI = BuildMI(MF, MI->getDebugLoc(), get(Opc))
1318 .addReg(Dest, RegState::Define | getDeadRegState(isDead))
1319 .addReg(0).addImm(1 << ShAmt)
1320 .addReg(Src, getKillRegState(isKill)).addImm(0).addReg(0);
1323 case X86::SHL16ri: {
1324 assert(MI->getNumOperands() >= 3 && "Unknown shift instruction!");
1325 // NOTE: LEA doesn't produce flags like shift does, but LLVM never uses
1326 // the flags produced by a shift yet, so this is safe.
1327 unsigned ShAmt = MI->getOperand(2).getImm();
1328 if (ShAmt == 0 || ShAmt >= 4) return 0;
1331 return is64Bit ? convertToThreeAddressWithLEA(MIOpc, MFI, MBBI, LV) : 0;
1332 NewMI = BuildMI(MF, MI->getDebugLoc(), get(X86::LEA16r))
1333 .addReg(Dest, RegState::Define | getDeadRegState(isDead))
1334 .addReg(0).addImm(1 << ShAmt)
1335 .addReg(Src, getKillRegState(isKill))
1336 .addImm(0).addReg(0);
1340 // The following opcodes also sets the condition code register(s). Only
1341 // convert them to equivalent lea if the condition code register def's
1343 if (hasLiveCondCodeDef(MI))
1350 case X86::INC64_32r: {
1351 assert(MI->getNumOperands() >= 2 && "Unknown inc instruction!");
1352 unsigned Opc = MIOpc == X86::INC64r ? X86::LEA64r
1353 : (is64Bit ? X86::LEA64_32r : X86::LEA32r);
1355 // LEA can't handle RSP.
1356 if (TargetRegisterInfo::isVirtualRegister(Src) &&
1357 !MF.getRegInfo().constrainRegClass(Src,
1358 MIOpc == X86::INC64r ? X86::GR64_NOSPRegisterClass :
1359 X86::GR32_NOSPRegisterClass))
1362 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(Opc))
1363 .addReg(Dest, RegState::Define |
1364 getDeadRegState(isDead)),
1369 case X86::INC64_16r:
1371 return is64Bit ? convertToThreeAddressWithLEA(MIOpc, MFI, MBBI, LV) : 0;
1372 assert(MI->getNumOperands() >= 2 && "Unknown inc instruction!");
1373 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(X86::LEA16r))
1374 .addReg(Dest, RegState::Define |
1375 getDeadRegState(isDead)),
1380 case X86::DEC64_32r: {
1381 assert(MI->getNumOperands() >= 2 && "Unknown dec instruction!");
1382 unsigned Opc = MIOpc == X86::DEC64r ? X86::LEA64r
1383 : (is64Bit ? X86::LEA64_32r : X86::LEA32r);
1384 // LEA can't handle RSP.
1385 if (TargetRegisterInfo::isVirtualRegister(Src) &&
1386 !MF.getRegInfo().constrainRegClass(Src,
1387 MIOpc == X86::DEC64r ? X86::GR64_NOSPRegisterClass :
1388 X86::GR32_NOSPRegisterClass))
1391 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(Opc))
1392 .addReg(Dest, RegState::Define |
1393 getDeadRegState(isDead)),
1398 case X86::DEC64_16r:
1400 return is64Bit ? convertToThreeAddressWithLEA(MIOpc, MFI, MBBI, LV) : 0;
1401 assert(MI->getNumOperands() >= 2 && "Unknown dec instruction!");
1402 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(X86::LEA16r))
1403 .addReg(Dest, RegState::Define |
1404 getDeadRegState(isDead)),
1408 case X86::ADD64rr_DB:
1410 case X86::ADD32rr_DB: {
1411 assert(MI->getNumOperands() >= 3 && "Unknown add instruction!");
1413 TargetRegisterClass *RC;
1414 if (MIOpc == X86::ADD64rr || MIOpc == X86::ADD64rr_DB) {
1416 RC = X86::GR64_NOSPRegisterClass;
1418 Opc = is64Bit ? X86::LEA64_32r : X86::LEA32r;
1419 RC = X86::GR32_NOSPRegisterClass;
1423 unsigned Src2 = MI->getOperand(2).getReg();
1424 bool isKill2 = MI->getOperand(2).isKill();
1426 // LEA can't handle RSP.
1427 if (TargetRegisterInfo::isVirtualRegister(Src2) &&
1428 !MF.getRegInfo().constrainRegClass(Src2, RC))
1431 NewMI = addRegReg(BuildMI(MF, MI->getDebugLoc(), get(Opc))
1432 .addReg(Dest, RegState::Define |
1433 getDeadRegState(isDead)),
1434 Src, isKill, Src2, isKill2);
1436 LV->replaceKillInstruction(Src2, MI, NewMI);
1440 case X86::ADD16rr_DB: {
1442 return is64Bit ? convertToThreeAddressWithLEA(MIOpc, MFI, MBBI, LV) : 0;
1443 assert(MI->getNumOperands() >= 3 && "Unknown add instruction!");
1444 unsigned Src2 = MI->getOperand(2).getReg();
1445 bool isKill2 = MI->getOperand(2).isKill();
1446 NewMI = addRegReg(BuildMI(MF, MI->getDebugLoc(), get(X86::LEA16r))
1447 .addReg(Dest, RegState::Define |
1448 getDeadRegState(isDead)),
1449 Src, isKill, Src2, isKill2);
1451 LV->replaceKillInstruction(Src2, MI, NewMI);
1454 case X86::ADD64ri32:
1456 case X86::ADD64ri32_DB:
1457 case X86::ADD64ri8_DB:
1458 assert(MI->getNumOperands() >= 3 && "Unknown add instruction!");
1459 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(X86::LEA64r))
1460 .addReg(Dest, RegState::Define |
1461 getDeadRegState(isDead)),
1462 Src, isKill, MI->getOperand(2).getImm());
1466 case X86::ADD32ri_DB:
1467 case X86::ADD32ri8_DB: {
1468 assert(MI->getNumOperands() >= 3 && "Unknown add instruction!");
1469 unsigned Opc = is64Bit ? X86::LEA64_32r : X86::LEA32r;
1470 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(Opc))
1471 .addReg(Dest, RegState::Define |
1472 getDeadRegState(isDead)),
1473 Src, isKill, MI->getOperand(2).getImm());
1478 case X86::ADD16ri_DB:
1479 case X86::ADD16ri8_DB:
1481 return is64Bit ? convertToThreeAddressWithLEA(MIOpc, MFI, MBBI, LV) : 0;
1482 assert(MI->getNumOperands() >= 3 && "Unknown add instruction!");
1483 NewMI = addRegOffset(BuildMI(MF, MI->getDebugLoc(), get(X86::LEA16r))
1484 .addReg(Dest, RegState::Define |
1485 getDeadRegState(isDead)),
1486 Src, isKill, MI->getOperand(2).getImm());
1492 if (!NewMI) return 0;
1494 if (LV) { // Update live variables
1496 LV->replaceKillInstruction(Src, MI, NewMI);
1498 LV->replaceKillInstruction(Dest, MI, NewMI);
1501 MFI->insert(MBBI, NewMI); // Insert the new inst
1505 /// commuteInstruction - We have a few instructions that must be hacked on to
1509 X86InstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
1510 switch (MI->getOpcode()) {
1511 case X86::SHRD16rri8: // A = SHRD16rri8 B, C, I -> A = SHLD16rri8 C, B, (16-I)
1512 case X86::SHLD16rri8: // A = SHLD16rri8 B, C, I -> A = SHRD16rri8 C, B, (16-I)
1513 case X86::SHRD32rri8: // A = SHRD32rri8 B, C, I -> A = SHLD32rri8 C, B, (32-I)
1514 case X86::SHLD32rri8: // A = SHLD32rri8 B, C, I -> A = SHRD32rri8 C, B, (32-I)
1515 case X86::SHRD64rri8: // A = SHRD64rri8 B, C, I -> A = SHLD64rri8 C, B, (64-I)
1516 case X86::SHLD64rri8:{// A = SHLD64rri8 B, C, I -> A = SHRD64rri8 C, B, (64-I)
1519 switch (MI->getOpcode()) {
1520 default: llvm_unreachable("Unreachable!");
1521 case X86::SHRD16rri8: Size = 16; Opc = X86::SHLD16rri8; break;
1522 case X86::SHLD16rri8: Size = 16; Opc = X86::SHRD16rri8; break;
1523 case X86::SHRD32rri8: Size = 32; Opc = X86::SHLD32rri8; break;
1524 case X86::SHLD32rri8: Size = 32; Opc = X86::SHRD32rri8; break;
1525 case X86::SHRD64rri8: Size = 64; Opc = X86::SHLD64rri8; break;
1526 case X86::SHLD64rri8: Size = 64; Opc = X86::SHRD64rri8; break;
1528 unsigned Amt = MI->getOperand(3).getImm();
1530 MachineFunction &MF = *MI->getParent()->getParent();
1531 MI = MF.CloneMachineInstr(MI);
1534 MI->setDesc(get(Opc));
1535 MI->getOperand(3).setImm(Size-Amt);
1536 return TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
1538 case X86::CMOVB16rr:
1539 case X86::CMOVB32rr:
1540 case X86::CMOVB64rr:
1541 case X86::CMOVAE16rr:
1542 case X86::CMOVAE32rr:
1543 case X86::CMOVAE64rr:
1544 case X86::CMOVE16rr:
1545 case X86::CMOVE32rr:
1546 case X86::CMOVE64rr:
1547 case X86::CMOVNE16rr:
1548 case X86::CMOVNE32rr:
1549 case X86::CMOVNE64rr:
1550 case X86::CMOVBE16rr:
1551 case X86::CMOVBE32rr:
1552 case X86::CMOVBE64rr:
1553 case X86::CMOVA16rr:
1554 case X86::CMOVA32rr:
1555 case X86::CMOVA64rr:
1556 case X86::CMOVL16rr:
1557 case X86::CMOVL32rr:
1558 case X86::CMOVL64rr:
1559 case X86::CMOVGE16rr:
1560 case X86::CMOVGE32rr:
1561 case X86::CMOVGE64rr:
1562 case X86::CMOVLE16rr:
1563 case X86::CMOVLE32rr:
1564 case X86::CMOVLE64rr:
1565 case X86::CMOVG16rr:
1566 case X86::CMOVG32rr:
1567 case X86::CMOVG64rr:
1568 case X86::CMOVS16rr:
1569 case X86::CMOVS32rr:
1570 case X86::CMOVS64rr:
1571 case X86::CMOVNS16rr:
1572 case X86::CMOVNS32rr:
1573 case X86::CMOVNS64rr:
1574 case X86::CMOVP16rr:
1575 case X86::CMOVP32rr:
1576 case X86::CMOVP64rr:
1577 case X86::CMOVNP16rr:
1578 case X86::CMOVNP32rr:
1579 case X86::CMOVNP64rr:
1580 case X86::CMOVO16rr:
1581 case X86::CMOVO32rr:
1582 case X86::CMOVO64rr:
1583 case X86::CMOVNO16rr:
1584 case X86::CMOVNO32rr:
1585 case X86::CMOVNO64rr: {
1587 switch (MI->getOpcode()) {
1589 case X86::CMOVB16rr: Opc = X86::CMOVAE16rr; break;
1590 case X86::CMOVB32rr: Opc = X86::CMOVAE32rr; break;
1591 case X86::CMOVB64rr: Opc = X86::CMOVAE64rr; break;
1592 case X86::CMOVAE16rr: Opc = X86::CMOVB16rr; break;
1593 case X86::CMOVAE32rr: Opc = X86::CMOVB32rr; break;
1594 case X86::CMOVAE64rr: Opc = X86::CMOVB64rr; break;
1595 case X86::CMOVE16rr: Opc = X86::CMOVNE16rr; break;
1596 case X86::CMOVE32rr: Opc = X86::CMOVNE32rr; break;
1597 case X86::CMOVE64rr: Opc = X86::CMOVNE64rr; break;
1598 case X86::CMOVNE16rr: Opc = X86::CMOVE16rr; break;
1599 case X86::CMOVNE32rr: Opc = X86::CMOVE32rr; break;
1600 case X86::CMOVNE64rr: Opc = X86::CMOVE64rr; break;
1601 case X86::CMOVBE16rr: Opc = X86::CMOVA16rr; break;
1602 case X86::CMOVBE32rr: Opc = X86::CMOVA32rr; break;
1603 case X86::CMOVBE64rr: Opc = X86::CMOVA64rr; break;
1604 case X86::CMOVA16rr: Opc = X86::CMOVBE16rr; break;
1605 case X86::CMOVA32rr: Opc = X86::CMOVBE32rr; break;
1606 case X86::CMOVA64rr: Opc = X86::CMOVBE64rr; break;
1607 case X86::CMOVL16rr: Opc = X86::CMOVGE16rr; break;
1608 case X86::CMOVL32rr: Opc = X86::CMOVGE32rr; break;
1609 case X86::CMOVL64rr: Opc = X86::CMOVGE64rr; break;
1610 case X86::CMOVGE16rr: Opc = X86::CMOVL16rr; break;
1611 case X86::CMOVGE32rr: Opc = X86::CMOVL32rr; break;
1612 case X86::CMOVGE64rr: Opc = X86::CMOVL64rr; break;
1613 case X86::CMOVLE16rr: Opc = X86::CMOVG16rr; break;
1614 case X86::CMOVLE32rr: Opc = X86::CMOVG32rr; break;
1615 case X86::CMOVLE64rr: Opc = X86::CMOVG64rr; break;
1616 case X86::CMOVG16rr: Opc = X86::CMOVLE16rr; break;
1617 case X86::CMOVG32rr: Opc = X86::CMOVLE32rr; break;
1618 case X86::CMOVG64rr: Opc = X86::CMOVLE64rr; break;
1619 case X86::CMOVS16rr: Opc = X86::CMOVNS16rr; break;
1620 case X86::CMOVS32rr: Opc = X86::CMOVNS32rr; break;
1621 case X86::CMOVS64rr: Opc = X86::CMOVNS64rr; break;
1622 case X86::CMOVNS16rr: Opc = X86::CMOVS16rr; break;
1623 case X86::CMOVNS32rr: Opc = X86::CMOVS32rr; break;
1624 case X86::CMOVNS64rr: Opc = X86::CMOVS64rr; break;
1625 case X86::CMOVP16rr: Opc = X86::CMOVNP16rr; break;
1626 case X86::CMOVP32rr: Opc = X86::CMOVNP32rr; break;
1627 case X86::CMOVP64rr: Opc = X86::CMOVNP64rr; break;
1628 case X86::CMOVNP16rr: Opc = X86::CMOVP16rr; break;
1629 case X86::CMOVNP32rr: Opc = X86::CMOVP32rr; break;
1630 case X86::CMOVNP64rr: Opc = X86::CMOVP64rr; break;
1631 case X86::CMOVO16rr: Opc = X86::CMOVNO16rr; break;
1632 case X86::CMOVO32rr: Opc = X86::CMOVNO32rr; break;
1633 case X86::CMOVO64rr: Opc = X86::CMOVNO64rr; break;
1634 case X86::CMOVNO16rr: Opc = X86::CMOVO16rr; break;
1635 case X86::CMOVNO32rr: Opc = X86::CMOVO32rr; break;
1636 case X86::CMOVNO64rr: Opc = X86::CMOVO64rr; break;
1639 MachineFunction &MF = *MI->getParent()->getParent();
1640 MI = MF.CloneMachineInstr(MI);
1643 MI->setDesc(get(Opc));
1644 // Fallthrough intended.
1647 return TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
1651 static X86::CondCode GetCondFromBranchOpc(unsigned BrOpc) {
1653 default: return X86::COND_INVALID;
1654 case X86::JE_4: return X86::COND_E;
1655 case X86::JNE_4: return X86::COND_NE;
1656 case X86::JL_4: return X86::COND_L;
1657 case X86::JLE_4: return X86::COND_LE;
1658 case X86::JG_4: return X86::COND_G;
1659 case X86::JGE_4: return X86::COND_GE;
1660 case X86::JB_4: return X86::COND_B;
1661 case X86::JBE_4: return X86::COND_BE;
1662 case X86::JA_4: return X86::COND_A;
1663 case X86::JAE_4: return X86::COND_AE;
1664 case X86::JS_4: return X86::COND_S;
1665 case X86::JNS_4: return X86::COND_NS;
1666 case X86::JP_4: return X86::COND_P;
1667 case X86::JNP_4: return X86::COND_NP;
1668 case X86::JO_4: return X86::COND_O;
1669 case X86::JNO_4: return X86::COND_NO;
1673 unsigned X86::GetCondBranchFromCond(X86::CondCode CC) {
1675 default: llvm_unreachable("Illegal condition code!");
1676 case X86::COND_E: return X86::JE_4;
1677 case X86::COND_NE: return X86::JNE_4;
1678 case X86::COND_L: return X86::JL_4;
1679 case X86::COND_LE: return X86::JLE_4;
1680 case X86::COND_G: return X86::JG_4;
1681 case X86::COND_GE: return X86::JGE_4;
1682 case X86::COND_B: return X86::JB_4;
1683 case X86::COND_BE: return X86::JBE_4;
1684 case X86::COND_A: return X86::JA_4;
1685 case X86::COND_AE: return X86::JAE_4;
1686 case X86::COND_S: return X86::JS_4;
1687 case X86::COND_NS: return X86::JNS_4;
1688 case X86::COND_P: return X86::JP_4;
1689 case X86::COND_NP: return X86::JNP_4;
1690 case X86::COND_O: return X86::JO_4;
1691 case X86::COND_NO: return X86::JNO_4;
1695 /// GetOppositeBranchCondition - Return the inverse of the specified condition,
1696 /// e.g. turning COND_E to COND_NE.
1697 X86::CondCode X86::GetOppositeBranchCondition(X86::CondCode CC) {
1699 default: llvm_unreachable("Illegal condition code!");
1700 case X86::COND_E: return X86::COND_NE;
1701 case X86::COND_NE: return X86::COND_E;
1702 case X86::COND_L: return X86::COND_GE;
1703 case X86::COND_LE: return X86::COND_G;
1704 case X86::COND_G: return X86::COND_LE;
1705 case X86::COND_GE: return X86::COND_L;
1706 case X86::COND_B: return X86::COND_AE;
1707 case X86::COND_BE: return X86::COND_A;
1708 case X86::COND_A: return X86::COND_BE;
1709 case X86::COND_AE: return X86::COND_B;
1710 case X86::COND_S: return X86::COND_NS;
1711 case X86::COND_NS: return X86::COND_S;
1712 case X86::COND_P: return X86::COND_NP;
1713 case X86::COND_NP: return X86::COND_P;
1714 case X86::COND_O: return X86::COND_NO;
1715 case X86::COND_NO: return X86::COND_O;
1719 bool X86InstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
1720 const MCInstrDesc &MCID = MI->getDesc();
1721 if (!MCID.isTerminator()) return false;
1723 // Conditional branch is a special case.
1724 if (MCID.isBranch() && !MCID.isBarrier())
1726 if (!MCID.isPredicable())
1728 return !isPredicated(MI);
1731 bool X86InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
1732 MachineBasicBlock *&TBB,
1733 MachineBasicBlock *&FBB,
1734 SmallVectorImpl<MachineOperand> &Cond,
1735 bool AllowModify) const {
1736 // Start from the bottom of the block and work up, examining the
1737 // terminator instructions.
1738 MachineBasicBlock::iterator I = MBB.end();
1739 MachineBasicBlock::iterator UnCondBrIter = MBB.end();
1740 while (I != MBB.begin()) {
1742 if (I->isDebugValue())
1745 // Working from the bottom, when we see a non-terminator instruction, we're
1747 if (!isUnpredicatedTerminator(I))
1750 // A terminator that isn't a branch can't easily be handled by this
1752 if (!I->getDesc().isBranch())
1755 // Handle unconditional branches.
1756 if (I->getOpcode() == X86::JMP_4) {
1760 TBB = I->getOperand(0).getMBB();
1764 // If the block has any instructions after a JMP, delete them.
1765 while (llvm::next(I) != MBB.end())
1766 llvm::next(I)->eraseFromParent();
1771 // Delete the JMP if it's equivalent to a fall-through.
1772 if (MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
1774 I->eraseFromParent();
1776 UnCondBrIter = MBB.end();
1780 // TBB is used to indicate the unconditional destination.
1781 TBB = I->getOperand(0).getMBB();
1785 // Handle conditional branches.
1786 X86::CondCode BranchCode = GetCondFromBranchOpc(I->getOpcode());
1787 if (BranchCode == X86::COND_INVALID)
1788 return true; // Can't handle indirect branch.
1790 // Working from the bottom, handle the first conditional branch.
1792 MachineBasicBlock *TargetBB = I->getOperand(0).getMBB();
1793 if (AllowModify && UnCondBrIter != MBB.end() &&
1794 MBB.isLayoutSuccessor(TargetBB)) {
1795 // If we can modify the code and it ends in something like:
1803 // Then we can change this to:
1810 // Which is a bit more efficient.
1811 // We conditionally jump to the fall-through block.
1812 BranchCode = GetOppositeBranchCondition(BranchCode);
1813 unsigned JNCC = GetCondBranchFromCond(BranchCode);
1814 MachineBasicBlock::iterator OldInst = I;
1816 BuildMI(MBB, UnCondBrIter, MBB.findDebugLoc(I), get(JNCC))
1817 .addMBB(UnCondBrIter->getOperand(0).getMBB());
1818 BuildMI(MBB, UnCondBrIter, MBB.findDebugLoc(I), get(X86::JMP_4))
1821 OldInst->eraseFromParent();
1822 UnCondBrIter->eraseFromParent();
1824 // Restart the analysis.
1825 UnCondBrIter = MBB.end();
1831 TBB = I->getOperand(0).getMBB();
1832 Cond.push_back(MachineOperand::CreateImm(BranchCode));
1836 // Handle subsequent conditional branches. Only handle the case where all
1837 // conditional branches branch to the same destination and their condition
1838 // opcodes fit one of the special multi-branch idioms.
1839 assert(Cond.size() == 1);
1842 // Only handle the case where all conditional branches branch to the same
1844 if (TBB != I->getOperand(0).getMBB())
1847 // If the conditions are the same, we can leave them alone.
1848 X86::CondCode OldBranchCode = (X86::CondCode)Cond[0].getImm();
1849 if (OldBranchCode == BranchCode)
1852 // If they differ, see if they fit one of the known patterns. Theoretically,
1853 // we could handle more patterns here, but we shouldn't expect to see them
1854 // if instruction selection has done a reasonable job.
1855 if ((OldBranchCode == X86::COND_NP &&
1856 BranchCode == X86::COND_E) ||
1857 (OldBranchCode == X86::COND_E &&
1858 BranchCode == X86::COND_NP))
1859 BranchCode = X86::COND_NP_OR_E;
1860 else if ((OldBranchCode == X86::COND_P &&
1861 BranchCode == X86::COND_NE) ||
1862 (OldBranchCode == X86::COND_NE &&
1863 BranchCode == X86::COND_P))
1864 BranchCode = X86::COND_NE_OR_P;
1868 // Update the MachineOperand.
1869 Cond[0].setImm(BranchCode);
1875 unsigned X86InstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
1876 MachineBasicBlock::iterator I = MBB.end();
1879 while (I != MBB.begin()) {
1881 if (I->isDebugValue())
1883 if (I->getOpcode() != X86::JMP_4 &&
1884 GetCondFromBranchOpc(I->getOpcode()) == X86::COND_INVALID)
1886 // Remove the branch.
1887 I->eraseFromParent();
1896 X86InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
1897 MachineBasicBlock *FBB,
1898 const SmallVectorImpl<MachineOperand> &Cond,
1899 DebugLoc DL) const {
1900 // Shouldn't be a fall through.
1901 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
1902 assert((Cond.size() == 1 || Cond.size() == 0) &&
1903 "X86 branch conditions have one component!");
1906 // Unconditional branch?
1907 assert(!FBB && "Unconditional branch with multiple successors!");
1908 BuildMI(&MBB, DL, get(X86::JMP_4)).addMBB(TBB);
1912 // Conditional branch.
1914 X86::CondCode CC = (X86::CondCode)Cond[0].getImm();
1916 case X86::COND_NP_OR_E:
1917 // Synthesize NP_OR_E with two branches.
1918 BuildMI(&MBB, DL, get(X86::JNP_4)).addMBB(TBB);
1920 BuildMI(&MBB, DL, get(X86::JE_4)).addMBB(TBB);
1923 case X86::COND_NE_OR_P:
1924 // Synthesize NE_OR_P with two branches.
1925 BuildMI(&MBB, DL, get(X86::JNE_4)).addMBB(TBB);
1927 BuildMI(&MBB, DL, get(X86::JP_4)).addMBB(TBB);
1931 unsigned Opc = GetCondBranchFromCond(CC);
1932 BuildMI(&MBB, DL, get(Opc)).addMBB(TBB);
1937 // Two-way Conditional branch. Insert the second branch.
1938 BuildMI(&MBB, DL, get(X86::JMP_4)).addMBB(FBB);
1944 /// isHReg - Test if the given register is a physical h register.
1945 static bool isHReg(unsigned Reg) {
1946 return X86::GR8_ABCD_HRegClass.contains(Reg);
1949 // Try and copy between VR128/VR64 and GR64 registers.
1950 static unsigned CopyToFromAsymmetricReg(unsigned DestReg, unsigned SrcReg) {
1951 // SrcReg(VR128) -> DestReg(GR64)
1952 // SrcReg(VR64) -> DestReg(GR64)
1953 // SrcReg(GR64) -> DestReg(VR128)
1954 // SrcReg(GR64) -> DestReg(VR64)
1956 if (X86::GR64RegClass.contains(DestReg)) {
1957 if (X86::VR128RegClass.contains(SrcReg)) {
1958 // Copy from a VR128 register to a GR64 register.
1959 return X86::MOVPQIto64rr;
1960 } else if (X86::VR64RegClass.contains(SrcReg)) {
1961 // Copy from a VR64 register to a GR64 register.
1962 return X86::MOVSDto64rr;
1964 } else if (X86::GR64RegClass.contains(SrcReg)) {
1965 // Copy from a GR64 register to a VR128 register.
1966 if (X86::VR128RegClass.contains(DestReg))
1967 return X86::MOV64toPQIrr;
1968 // Copy from a GR64 register to a VR64 register.
1969 else if (X86::VR64RegClass.contains(DestReg))
1970 return X86::MOV64toSDrr;
1976 void X86InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
1977 MachineBasicBlock::iterator MI, DebugLoc DL,
1978 unsigned DestReg, unsigned SrcReg,
1979 bool KillSrc) const {
1980 // First deal with the normal symmetric copies.
1982 if (X86::GR64RegClass.contains(DestReg, SrcReg))
1984 else if (X86::GR32RegClass.contains(DestReg, SrcReg))
1986 else if (X86::GR16RegClass.contains(DestReg, SrcReg))
1988 else if (X86::GR8RegClass.contains(DestReg, SrcReg)) {
1989 // Copying to or from a physical H register on x86-64 requires a NOREX
1990 // move. Otherwise use a normal move.
1991 if ((isHReg(DestReg) || isHReg(SrcReg)) &&
1992 TM.getSubtarget<X86Subtarget>().is64Bit())
1993 Opc = X86::MOV8rr_NOREX;
1996 } else if (X86::VR128RegClass.contains(DestReg, SrcReg))
1997 Opc = X86::MOVAPSrr;
1998 else if (X86::VR256RegClass.contains(DestReg, SrcReg))
1999 Opc = X86::VMOVAPSYrr;
2000 else if (X86::VR64RegClass.contains(DestReg, SrcReg))
2001 Opc = X86::MMX_MOVQ64rr;
2003 Opc = CopyToFromAsymmetricReg(DestReg, SrcReg);
2006 BuildMI(MBB, MI, DL, get(Opc), DestReg)
2007 .addReg(SrcReg, getKillRegState(KillSrc));
2011 // Moving EFLAGS to / from another register requires a push and a pop.
2012 if (SrcReg == X86::EFLAGS) {
2013 if (X86::GR64RegClass.contains(DestReg)) {
2014 BuildMI(MBB, MI, DL, get(X86::PUSHF64));
2015 BuildMI(MBB, MI, DL, get(X86::POP64r), DestReg);
2017 } else if (X86::GR32RegClass.contains(DestReg)) {
2018 BuildMI(MBB, MI, DL, get(X86::PUSHF32));
2019 BuildMI(MBB, MI, DL, get(X86::POP32r), DestReg);
2023 if (DestReg == X86::EFLAGS) {
2024 if (X86::GR64RegClass.contains(SrcReg)) {
2025 BuildMI(MBB, MI, DL, get(X86::PUSH64r))
2026 .addReg(SrcReg, getKillRegState(KillSrc));
2027 BuildMI(MBB, MI, DL, get(X86::POPF64));
2029 } else if (X86::GR32RegClass.contains(SrcReg)) {
2030 BuildMI(MBB, MI, DL, get(X86::PUSH32r))
2031 .addReg(SrcReg, getKillRegState(KillSrc));
2032 BuildMI(MBB, MI, DL, get(X86::POPF32));
2037 DEBUG(dbgs() << "Cannot copy " << RI.getName(SrcReg)
2038 << " to " << RI.getName(DestReg) << '\n');
2039 llvm_unreachable("Cannot emit physreg copy instruction");
2042 static unsigned getLoadStoreRegOpcode(unsigned Reg,
2043 const TargetRegisterClass *RC,
2044 bool isStackAligned,
2045 const TargetMachine &TM,
2047 switch (RC->getSize()) {
2049 llvm_unreachable("Unknown spill size");
2051 assert(X86::GR8RegClass.hasSubClassEq(RC) && "Unknown 1-byte regclass");
2052 if (TM.getSubtarget<X86Subtarget>().is64Bit())
2053 // Copying to or from a physical H register on x86-64 requires a NOREX
2054 // move. Otherwise use a normal move.
2055 if (isHReg(Reg) || X86::GR8_ABCD_HRegClass.hasSubClassEq(RC))
2056 return load ? X86::MOV8rm_NOREX : X86::MOV8mr_NOREX;
2057 return load ? X86::MOV8rm : X86::MOV8mr;
2059 assert(X86::GR16RegClass.hasSubClassEq(RC) && "Unknown 2-byte regclass");
2060 return load ? X86::MOV16rm : X86::MOV16mr;
2062 if (X86::GR32RegClass.hasSubClassEq(RC))
2063 return load ? X86::MOV32rm : X86::MOV32mr;
2064 if (X86::FR32RegClass.hasSubClassEq(RC))
2065 return load ? X86::MOVSSrm : X86::MOVSSmr;
2066 if (X86::RFP32RegClass.hasSubClassEq(RC))
2067 return load ? X86::LD_Fp32m : X86::ST_Fp32m;
2068 llvm_unreachable("Unknown 4-byte regclass");
2070 if (X86::GR64RegClass.hasSubClassEq(RC))
2071 return load ? X86::MOV64rm : X86::MOV64mr;
2072 if (X86::FR64RegClass.hasSubClassEq(RC))
2073 return load ? X86::MOVSDrm : X86::MOVSDmr;
2074 if (X86::VR64RegClass.hasSubClassEq(RC))
2075 return load ? X86::MMX_MOVQ64rm : X86::MMX_MOVQ64mr;
2076 if (X86::RFP64RegClass.hasSubClassEq(RC))
2077 return load ? X86::LD_Fp64m : X86::ST_Fp64m;
2078 llvm_unreachable("Unknown 8-byte regclass");
2080 assert(X86::RFP80RegClass.hasSubClassEq(RC) && "Unknown 10-byte regclass");
2081 return load ? X86::LD_Fp80m : X86::ST_FpP80m;
2083 assert(X86::VR128RegClass.hasSubClassEq(RC) && "Unknown 16-byte regclass");
2084 // If stack is realigned we can use aligned stores.
2086 return load ? X86::MOVAPSrm : X86::MOVAPSmr;
2088 return load ? X86::MOVUPSrm : X86::MOVUPSmr;
2090 assert(X86::VR256RegClass.hasSubClassEq(RC) && "Unknown 32-byte regclass");
2091 // If stack is realigned we can use aligned stores.
2093 return load ? X86::VMOVAPSYrm : X86::VMOVAPSYmr;
2095 return load ? X86::VMOVUPSYrm : X86::VMOVUPSYmr;
2099 static unsigned getStoreRegOpcode(unsigned SrcReg,
2100 const TargetRegisterClass *RC,
2101 bool isStackAligned,
2102 TargetMachine &TM) {
2103 return getLoadStoreRegOpcode(SrcReg, RC, isStackAligned, TM, false);
2107 static unsigned getLoadRegOpcode(unsigned DestReg,
2108 const TargetRegisterClass *RC,
2109 bool isStackAligned,
2110 const TargetMachine &TM) {
2111 return getLoadStoreRegOpcode(DestReg, RC, isStackAligned, TM, true);
2114 void X86InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
2115 MachineBasicBlock::iterator MI,
2116 unsigned SrcReg, bool isKill, int FrameIdx,
2117 const TargetRegisterClass *RC,
2118 const TargetRegisterInfo *TRI) const {
2119 const MachineFunction &MF = *MBB.getParent();
2120 assert(MF.getFrameInfo()->getObjectSize(FrameIdx) >= RC->getSize() &&
2121 "Stack slot too small for store");
2122 bool isAligned = (TM.getFrameLowering()->getStackAlignment() >= 16) ||
2123 RI.canRealignStack(MF);
2124 unsigned Opc = getStoreRegOpcode(SrcReg, RC, isAligned, TM);
2125 DebugLoc DL = MBB.findDebugLoc(MI);
2126 addFrameReference(BuildMI(MBB, MI, DL, get(Opc)), FrameIdx)
2127 .addReg(SrcReg, getKillRegState(isKill));
2130 void X86InstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
2132 SmallVectorImpl<MachineOperand> &Addr,
2133 const TargetRegisterClass *RC,
2134 MachineInstr::mmo_iterator MMOBegin,
2135 MachineInstr::mmo_iterator MMOEnd,
2136 SmallVectorImpl<MachineInstr*> &NewMIs) const {
2137 bool isAligned = MMOBegin != MMOEnd && (*MMOBegin)->getAlignment() >= 16;
2138 unsigned Opc = getStoreRegOpcode(SrcReg, RC, isAligned, TM);
2140 MachineInstrBuilder MIB = BuildMI(MF, DL, get(Opc));
2141 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
2142 MIB.addOperand(Addr[i]);
2143 MIB.addReg(SrcReg, getKillRegState(isKill));
2144 (*MIB).setMemRefs(MMOBegin, MMOEnd);
2145 NewMIs.push_back(MIB);
2149 void X86InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
2150 MachineBasicBlock::iterator MI,
2151 unsigned DestReg, int FrameIdx,
2152 const TargetRegisterClass *RC,
2153 const TargetRegisterInfo *TRI) const {
2154 const MachineFunction &MF = *MBB.getParent();
2155 bool isAligned = (TM.getFrameLowering()->getStackAlignment() >= 16) ||
2156 RI.canRealignStack(MF);
2157 unsigned Opc = getLoadRegOpcode(DestReg, RC, isAligned, TM);
2158 DebugLoc DL = MBB.findDebugLoc(MI);
2159 addFrameReference(BuildMI(MBB, MI, DL, get(Opc), DestReg), FrameIdx);
2162 void X86InstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
2163 SmallVectorImpl<MachineOperand> &Addr,
2164 const TargetRegisterClass *RC,
2165 MachineInstr::mmo_iterator MMOBegin,
2166 MachineInstr::mmo_iterator MMOEnd,
2167 SmallVectorImpl<MachineInstr*> &NewMIs) const {
2168 bool isAligned = MMOBegin != MMOEnd && (*MMOBegin)->getAlignment() >= 16;
2169 unsigned Opc = getLoadRegOpcode(DestReg, RC, isAligned, TM);
2171 MachineInstrBuilder MIB = BuildMI(MF, DL, get(Opc), DestReg);
2172 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
2173 MIB.addOperand(Addr[i]);
2174 (*MIB).setMemRefs(MMOBegin, MMOEnd);
2175 NewMIs.push_back(MIB);
2179 X86InstrInfo::emitFrameIndexDebugValue(MachineFunction &MF,
2180 int FrameIx, uint64_t Offset,
2181 const MDNode *MDPtr,
2182 DebugLoc DL) const {
2184 AM.BaseType = X86AddressMode::FrameIndexBase;
2185 AM.Base.FrameIndex = FrameIx;
2186 MachineInstrBuilder MIB = BuildMI(MF, DL, get(X86::DBG_VALUE));
2187 addFullAddress(MIB, AM).addImm(Offset).addMetadata(MDPtr);
2191 static MachineInstr *FuseTwoAddrInst(MachineFunction &MF, unsigned Opcode,
2192 const SmallVectorImpl<MachineOperand> &MOs,
2194 const TargetInstrInfo &TII) {
2195 // Create the base instruction with the memory operand as the first part.
2196 MachineInstr *NewMI = MF.CreateMachineInstr(TII.get(Opcode),
2197 MI->getDebugLoc(), true);
2198 MachineInstrBuilder MIB(NewMI);
2199 unsigned NumAddrOps = MOs.size();
2200 for (unsigned i = 0; i != NumAddrOps; ++i)
2201 MIB.addOperand(MOs[i]);
2202 if (NumAddrOps < 4) // FrameIndex only
2205 // Loop over the rest of the ri operands, converting them over.
2206 unsigned NumOps = MI->getDesc().getNumOperands()-2;
2207 for (unsigned i = 0; i != NumOps; ++i) {
2208 MachineOperand &MO = MI->getOperand(i+2);
2211 for (unsigned i = NumOps+2, e = MI->getNumOperands(); i != e; ++i) {
2212 MachineOperand &MO = MI->getOperand(i);
2218 static MachineInstr *FuseInst(MachineFunction &MF,
2219 unsigned Opcode, unsigned OpNo,
2220 const SmallVectorImpl<MachineOperand> &MOs,
2221 MachineInstr *MI, const TargetInstrInfo &TII) {
2222 MachineInstr *NewMI = MF.CreateMachineInstr(TII.get(Opcode),
2223 MI->getDebugLoc(), true);
2224 MachineInstrBuilder MIB(NewMI);
2226 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
2227 MachineOperand &MO = MI->getOperand(i);
2229 assert(MO.isReg() && "Expected to fold into reg operand!");
2230 unsigned NumAddrOps = MOs.size();
2231 for (unsigned i = 0; i != NumAddrOps; ++i)
2232 MIB.addOperand(MOs[i]);
2233 if (NumAddrOps < 4) // FrameIndex only
2242 static MachineInstr *MakeM0Inst(const TargetInstrInfo &TII, unsigned Opcode,
2243 const SmallVectorImpl<MachineOperand> &MOs,
2245 MachineFunction &MF = *MI->getParent()->getParent();
2246 MachineInstrBuilder MIB = BuildMI(MF, MI->getDebugLoc(), TII.get(Opcode));
2248 unsigned NumAddrOps = MOs.size();
2249 for (unsigned i = 0; i != NumAddrOps; ++i)
2250 MIB.addOperand(MOs[i]);
2251 if (NumAddrOps < 4) // FrameIndex only
2253 return MIB.addImm(0);
2257 X86InstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
2258 MachineInstr *MI, unsigned i,
2259 const SmallVectorImpl<MachineOperand> &MOs,
2260 unsigned Size, unsigned Align) const {
2261 const DenseMap<unsigned, std::pair<unsigned,unsigned> > *OpcodeTablePtr = 0;
2262 bool isTwoAddrFold = false;
2263 unsigned NumOps = MI->getDesc().getNumOperands();
2264 bool isTwoAddr = NumOps > 1 &&
2265 MI->getDesc().getOperandConstraint(1, MCOI::TIED_TO) != -1;
2267 // FIXME: AsmPrinter doesn't know how to handle
2268 // X86II::MO_GOT_ABSOLUTE_ADDRESS after folding.
2269 if (MI->getOpcode() == X86::ADD32ri &&
2270 MI->getOperand(2).getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS)
2273 MachineInstr *NewMI = NULL;
2274 // Folding a memory location into the two-address part of a two-address
2275 // instruction is different than folding it other places. It requires
2276 // replacing the *two* registers with the memory location.
2277 if (isTwoAddr && NumOps >= 2 && i < 2 &&
2278 MI->getOperand(0).isReg() &&
2279 MI->getOperand(1).isReg() &&
2280 MI->getOperand(0).getReg() == MI->getOperand(1).getReg()) {
2281 OpcodeTablePtr = &RegOp2MemOpTable2Addr;
2282 isTwoAddrFold = true;
2283 } else if (i == 0) { // If operand 0
2284 if (MI->getOpcode() == X86::MOV64r0)
2285 NewMI = MakeM0Inst(*this, X86::MOV64mi32, MOs, MI);
2286 else if (MI->getOpcode() == X86::MOV32r0)
2287 NewMI = MakeM0Inst(*this, X86::MOV32mi, MOs, MI);
2288 else if (MI->getOpcode() == X86::MOV16r0)
2289 NewMI = MakeM0Inst(*this, X86::MOV16mi, MOs, MI);
2290 else if (MI->getOpcode() == X86::MOV8r0)
2291 NewMI = MakeM0Inst(*this, X86::MOV8mi, MOs, MI);
2295 OpcodeTablePtr = &RegOp2MemOpTable0;
2296 } else if (i == 1) {
2297 OpcodeTablePtr = &RegOp2MemOpTable1;
2298 } else if (i == 2) {
2299 OpcodeTablePtr = &RegOp2MemOpTable2;
2302 // If table selected...
2303 if (OpcodeTablePtr) {
2304 // Find the Opcode to fuse
2305 DenseMap<unsigned, std::pair<unsigned,unsigned> >::const_iterator I =
2306 OpcodeTablePtr->find(MI->getOpcode());
2307 if (I != OpcodeTablePtr->end()) {
2308 unsigned Opcode = I->second.first;
2309 unsigned MinAlign = I->second.second;
2310 if (Align < MinAlign)
2312 bool NarrowToMOV32rm = false;
2314 unsigned RCSize = getRegClass(MI->getDesc(), i, &RI)->getSize();
2315 if (Size < RCSize) {
2316 // Check if it's safe to fold the load. If the size of the object is
2317 // narrower than the load width, then it's not.
2318 if (Opcode != X86::MOV64rm || RCSize != 8 || Size != 4)
2320 // If this is a 64-bit load, but the spill slot is 32, then we can do
2321 // a 32-bit load which is implicitly zero-extended. This likely is due
2322 // to liveintervalanalysis remat'ing a load from stack slot.
2323 if (MI->getOperand(0).getSubReg() || MI->getOperand(1).getSubReg())
2325 Opcode = X86::MOV32rm;
2326 NarrowToMOV32rm = true;
2331 NewMI = FuseTwoAddrInst(MF, Opcode, MOs, MI, *this);
2333 NewMI = FuseInst(MF, Opcode, i, MOs, MI, *this);
2335 if (NarrowToMOV32rm) {
2336 // If this is the special case where we use a MOV32rm to load a 32-bit
2337 // value and zero-extend the top bits. Change the destination register
2339 unsigned DstReg = NewMI->getOperand(0).getReg();
2340 if (TargetRegisterInfo::isPhysicalRegister(DstReg))
2341 NewMI->getOperand(0).setReg(RI.getSubReg(DstReg,
2344 NewMI->getOperand(0).setSubReg(X86::sub_32bit);
2351 if (PrintFailedFusing && !MI->isCopy())
2352 dbgs() << "We failed to fuse operand " << i << " in " << *MI;
2357 MachineInstr* X86InstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
2359 const SmallVectorImpl<unsigned> &Ops,
2360 int FrameIndex) const {
2361 // Check switch flag
2362 if (NoFusing) return NULL;
2364 if (!MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize))
2365 switch (MI->getOpcode()) {
2366 case X86::CVTSD2SSrr:
2367 case X86::Int_CVTSD2SSrr:
2368 case X86::CVTSS2SDrr:
2369 case X86::Int_CVTSS2SDrr:
2371 case X86::RCPSSr_Int:
2375 case X86::RSQRTSSr_Int:
2377 case X86::SQRTSSr_Int:
2381 const MachineFrameInfo *MFI = MF.getFrameInfo();
2382 unsigned Size = MFI->getObjectSize(FrameIndex);
2383 unsigned Alignment = MFI->getObjectAlignment(FrameIndex);
2384 if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
2385 unsigned NewOpc = 0;
2386 unsigned RCSize = 0;
2387 switch (MI->getOpcode()) {
2388 default: return NULL;
2389 case X86::TEST8rr: NewOpc = X86::CMP8ri; RCSize = 1; break;
2390 case X86::TEST16rr: NewOpc = X86::CMP16ri8; RCSize = 2; break;
2391 case X86::TEST32rr: NewOpc = X86::CMP32ri8; RCSize = 4; break;
2392 case X86::TEST64rr: NewOpc = X86::CMP64ri8; RCSize = 8; break;
2394 // Check if it's safe to fold the load. If the size of the object is
2395 // narrower than the load width, then it's not.
2398 // Change to CMPXXri r, 0 first.
2399 MI->setDesc(get(NewOpc));
2400 MI->getOperand(1).ChangeToImmediate(0);
2401 } else if (Ops.size() != 1)
2404 SmallVector<MachineOperand,4> MOs;
2405 MOs.push_back(MachineOperand::CreateFI(FrameIndex));
2406 return foldMemoryOperandImpl(MF, MI, Ops[0], MOs, Size, Alignment);
2409 MachineInstr* X86InstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
2411 const SmallVectorImpl<unsigned> &Ops,
2412 MachineInstr *LoadMI) const {
2413 // Check switch flag
2414 if (NoFusing) return NULL;
2416 if (!MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize))
2417 switch (MI->getOpcode()) {
2418 case X86::CVTSD2SSrr:
2419 case X86::Int_CVTSD2SSrr:
2420 case X86::CVTSS2SDrr:
2421 case X86::Int_CVTSS2SDrr:
2423 case X86::RCPSSr_Int:
2427 case X86::RSQRTSSr_Int:
2429 case X86::SQRTSSr_Int:
2433 // Determine the alignment of the load.
2434 unsigned Alignment = 0;
2435 if (LoadMI->hasOneMemOperand())
2436 Alignment = (*LoadMI->memoperands_begin())->getAlignment();
2438 switch (LoadMI->getOpcode()) {
2439 case X86::AVX_SET0PSY:
2440 case X86::AVX_SET0PDY:
2446 case X86::V_SETALLONES:
2447 case X86::AVX_SET0PS:
2448 case X86::AVX_SET0PD:
2449 case X86::AVX_SET0PI:
2453 case X86::VFsFLD0SD:
2457 case X86::VFsFLD0SS:
2463 if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
2464 unsigned NewOpc = 0;
2465 switch (MI->getOpcode()) {
2466 default: return NULL;
2467 case X86::TEST8rr: NewOpc = X86::CMP8ri; break;
2468 case X86::TEST16rr: NewOpc = X86::CMP16ri8; break;
2469 case X86::TEST32rr: NewOpc = X86::CMP32ri8; break;
2470 case X86::TEST64rr: NewOpc = X86::CMP64ri8; break;
2472 // Change to CMPXXri r, 0 first.
2473 MI->setDesc(get(NewOpc));
2474 MI->getOperand(1).ChangeToImmediate(0);
2475 } else if (Ops.size() != 1)
2478 // Make sure the subregisters match.
2479 // Otherwise we risk changing the size of the load.
2480 if (LoadMI->getOperand(0).getSubReg() != MI->getOperand(Ops[0]).getSubReg())
2483 SmallVector<MachineOperand,X86::AddrNumOperands> MOs;
2484 switch (LoadMI->getOpcode()) {
2488 case X86::V_SETALLONES:
2489 case X86::AVX_SET0PS:
2490 case X86::AVX_SET0PD:
2491 case X86::AVX_SET0PI:
2492 case X86::AVX_SET0PSY:
2493 case X86::AVX_SET0PDY:
2495 case X86::FsFLD0SS: {
2496 // Folding a V_SET0P? or V_SETALLONES as a load, to ease register pressure.
2497 // Create a constant-pool entry and operands to load from it.
2499 // Medium and large mode can't fold loads this way.
2500 if (TM.getCodeModel() != CodeModel::Small &&
2501 TM.getCodeModel() != CodeModel::Kernel)
2504 // x86-32 PIC requires a PIC base register for constant pools.
2505 unsigned PICBase = 0;
2506 if (TM.getRelocationModel() == Reloc::PIC_) {
2507 if (TM.getSubtarget<X86Subtarget>().is64Bit())
2510 // FIXME: PICBase = getGlobalBaseReg(&MF);
2511 // This doesn't work for several reasons.
2512 // 1. GlobalBaseReg may have been spilled.
2513 // 2. It may not be live at MI.
2517 // Create a constant-pool entry.
2518 MachineConstantPool &MCP = *MF.getConstantPool();
2520 unsigned Opc = LoadMI->getOpcode();
2521 if (Opc == X86::FsFLD0SS || Opc == X86::VFsFLD0SS)
2522 Ty = Type::getFloatTy(MF.getFunction()->getContext());
2523 else if (Opc == X86::FsFLD0SD || Opc == X86::VFsFLD0SD)
2524 Ty = Type::getDoubleTy(MF.getFunction()->getContext());
2525 else if (Opc == X86::AVX_SET0PSY || Opc == X86::AVX_SET0PDY)
2526 Ty = VectorType::get(Type::getFloatTy(MF.getFunction()->getContext()), 8);
2528 Ty = VectorType::get(Type::getInt32Ty(MF.getFunction()->getContext()), 4);
2529 const Constant *C = LoadMI->getOpcode() == X86::V_SETALLONES ?
2530 Constant::getAllOnesValue(Ty) :
2531 Constant::getNullValue(Ty);
2532 unsigned CPI = MCP.getConstantPoolIndex(C, Alignment);
2534 // Create operands to load from the constant pool entry.
2535 MOs.push_back(MachineOperand::CreateReg(PICBase, false));
2536 MOs.push_back(MachineOperand::CreateImm(1));
2537 MOs.push_back(MachineOperand::CreateReg(0, false));
2538 MOs.push_back(MachineOperand::CreateCPI(CPI, 0));
2539 MOs.push_back(MachineOperand::CreateReg(0, false));
2543 // Folding a normal load. Just copy the load's address operands.
2544 unsigned NumOps = LoadMI->getDesc().getNumOperands();
2545 for (unsigned i = NumOps - X86::AddrNumOperands; i != NumOps; ++i)
2546 MOs.push_back(LoadMI->getOperand(i));
2550 return foldMemoryOperandImpl(MF, MI, Ops[0], MOs, 0, Alignment);
2554 bool X86InstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
2555 const SmallVectorImpl<unsigned> &Ops) const {
2556 // Check switch flag
2557 if (NoFusing) return 0;
2559 if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
2560 switch (MI->getOpcode()) {
2561 default: return false;
2568 // FIXME: AsmPrinter doesn't know how to handle
2569 // X86II::MO_GOT_ABSOLUTE_ADDRESS after folding.
2570 if (MI->getOperand(2).getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS)
2576 if (Ops.size() != 1)
2579 unsigned OpNum = Ops[0];
2580 unsigned Opc = MI->getOpcode();
2581 unsigned NumOps = MI->getDesc().getNumOperands();
2582 bool isTwoAddr = NumOps > 1 &&
2583 MI->getDesc().getOperandConstraint(1, MCOI::TIED_TO) != -1;
2585 // Folding a memory location into the two-address part of a two-address
2586 // instruction is different than folding it other places. It requires
2587 // replacing the *two* registers with the memory location.
2588 const DenseMap<unsigned, std::pair<unsigned,unsigned> > *OpcodeTablePtr = 0;
2589 if (isTwoAddr && NumOps >= 2 && OpNum < 2) {
2590 OpcodeTablePtr = &RegOp2MemOpTable2Addr;
2591 } else if (OpNum == 0) { // If operand 0
2596 case X86::MOV64r0: return true;
2599 OpcodeTablePtr = &RegOp2MemOpTable0;
2600 } else if (OpNum == 1) {
2601 OpcodeTablePtr = &RegOp2MemOpTable1;
2602 } else if (OpNum == 2) {
2603 OpcodeTablePtr = &RegOp2MemOpTable2;
2606 if (OpcodeTablePtr && OpcodeTablePtr->count(Opc))
2608 return TargetInstrInfoImpl::canFoldMemoryOperand(MI, Ops);
2611 bool X86InstrInfo::unfoldMemoryOperand(MachineFunction &MF, MachineInstr *MI,
2612 unsigned Reg, bool UnfoldLoad, bool UnfoldStore,
2613 SmallVectorImpl<MachineInstr*> &NewMIs) const {
2614 DenseMap<unsigned, std::pair<unsigned,unsigned> >::const_iterator I =
2615 MemOp2RegOpTable.find(MI->getOpcode());
2616 if (I == MemOp2RegOpTable.end())
2618 unsigned Opc = I->second.first;
2619 unsigned Index = I->second.second & 0xf;
2620 bool FoldedLoad = I->second.second & (1 << 4);
2621 bool FoldedStore = I->second.second & (1 << 5);
2622 if (UnfoldLoad && !FoldedLoad)
2624 UnfoldLoad &= FoldedLoad;
2625 if (UnfoldStore && !FoldedStore)
2627 UnfoldStore &= FoldedStore;
2629 const MCInstrDesc &MCID = get(Opc);
2630 const TargetRegisterClass *RC = getRegClass(MCID, Index, &RI);
2631 if (!MI->hasOneMemOperand() &&
2632 RC == &X86::VR128RegClass &&
2633 !TM.getSubtarget<X86Subtarget>().isUnalignedMemAccessFast())
2634 // Without memoperands, loadRegFromAddr and storeRegToStackSlot will
2635 // conservatively assume the address is unaligned. That's bad for
2638 SmallVector<MachineOperand, X86::AddrNumOperands> AddrOps;
2639 SmallVector<MachineOperand,2> BeforeOps;
2640 SmallVector<MachineOperand,2> AfterOps;
2641 SmallVector<MachineOperand,4> ImpOps;
2642 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
2643 MachineOperand &Op = MI->getOperand(i);
2644 if (i >= Index && i < Index + X86::AddrNumOperands)
2645 AddrOps.push_back(Op);
2646 else if (Op.isReg() && Op.isImplicit())
2647 ImpOps.push_back(Op);
2649 BeforeOps.push_back(Op);
2651 AfterOps.push_back(Op);
2654 // Emit the load instruction.
2656 std::pair<MachineInstr::mmo_iterator,
2657 MachineInstr::mmo_iterator> MMOs =
2658 MF.extractLoadMemRefs(MI->memoperands_begin(),
2659 MI->memoperands_end());
2660 loadRegFromAddr(MF, Reg, AddrOps, RC, MMOs.first, MMOs.second, NewMIs);
2662 // Address operands cannot be marked isKill.
2663 for (unsigned i = 1; i != 1 + X86::AddrNumOperands; ++i) {
2664 MachineOperand &MO = NewMIs[0]->getOperand(i);
2666 MO.setIsKill(false);
2671 // Emit the data processing instruction.
2672 MachineInstr *DataMI = MF.CreateMachineInstr(MCID, MI->getDebugLoc(), true);
2673 MachineInstrBuilder MIB(DataMI);
2676 MIB.addReg(Reg, RegState::Define);
2677 for (unsigned i = 0, e = BeforeOps.size(); i != e; ++i)
2678 MIB.addOperand(BeforeOps[i]);
2681 for (unsigned i = 0, e = AfterOps.size(); i != e; ++i)
2682 MIB.addOperand(AfterOps[i]);
2683 for (unsigned i = 0, e = ImpOps.size(); i != e; ++i) {
2684 MachineOperand &MO = ImpOps[i];
2685 MIB.addReg(MO.getReg(),
2686 getDefRegState(MO.isDef()) |
2687 RegState::Implicit |
2688 getKillRegState(MO.isKill()) |
2689 getDeadRegState(MO.isDead()) |
2690 getUndefRegState(MO.isUndef()));
2692 // Change CMP32ri r, 0 back to TEST32rr r, r, etc.
2693 unsigned NewOpc = 0;
2694 switch (DataMI->getOpcode()) {
2696 case X86::CMP64ri32:
2703 MachineOperand &MO0 = DataMI->getOperand(0);
2704 MachineOperand &MO1 = DataMI->getOperand(1);
2705 if (MO1.getImm() == 0) {
2706 switch (DataMI->getOpcode()) {
2709 case X86::CMP64ri32: NewOpc = X86::TEST64rr; break;
2711 case X86::CMP32ri: NewOpc = X86::TEST32rr; break;
2713 case X86::CMP16ri: NewOpc = X86::TEST16rr; break;
2714 case X86::CMP8ri: NewOpc = X86::TEST8rr; break;
2716 DataMI->setDesc(get(NewOpc));
2717 MO1.ChangeToRegister(MO0.getReg(), false);
2721 NewMIs.push_back(DataMI);
2723 // Emit the store instruction.
2725 const TargetRegisterClass *DstRC = getRegClass(MCID, 0, &RI);
2726 std::pair<MachineInstr::mmo_iterator,
2727 MachineInstr::mmo_iterator> MMOs =
2728 MF.extractStoreMemRefs(MI->memoperands_begin(),
2729 MI->memoperands_end());
2730 storeRegToAddr(MF, Reg, true, AddrOps, DstRC, MMOs.first, MMOs.second, NewMIs);
2737 X86InstrInfo::unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
2738 SmallVectorImpl<SDNode*> &NewNodes) const {
2739 if (!N->isMachineOpcode())
2742 DenseMap<unsigned, std::pair<unsigned,unsigned> >::const_iterator I =
2743 MemOp2RegOpTable.find(N->getMachineOpcode());
2744 if (I == MemOp2RegOpTable.end())
2746 unsigned Opc = I->second.first;
2747 unsigned Index = I->second.second & 0xf;
2748 bool FoldedLoad = I->second.second & (1 << 4);
2749 bool FoldedStore = I->second.second & (1 << 5);
2750 const MCInstrDesc &MCID = get(Opc);
2751 const TargetRegisterClass *RC = getRegClass(MCID, Index, &RI);
2752 unsigned NumDefs = MCID.NumDefs;
2753 std::vector<SDValue> AddrOps;
2754 std::vector<SDValue> BeforeOps;
2755 std::vector<SDValue> AfterOps;
2756 DebugLoc dl = N->getDebugLoc();
2757 unsigned NumOps = N->getNumOperands();
2758 for (unsigned i = 0; i != NumOps-1; ++i) {
2759 SDValue Op = N->getOperand(i);
2760 if (i >= Index-NumDefs && i < Index-NumDefs + X86::AddrNumOperands)
2761 AddrOps.push_back(Op);
2762 else if (i < Index-NumDefs)
2763 BeforeOps.push_back(Op);
2764 else if (i > Index-NumDefs)
2765 AfterOps.push_back(Op);
2767 SDValue Chain = N->getOperand(NumOps-1);
2768 AddrOps.push_back(Chain);
2770 // Emit the load instruction.
2772 MachineFunction &MF = DAG.getMachineFunction();
2774 EVT VT = *RC->vt_begin();
2775 std::pair<MachineInstr::mmo_iterator,
2776 MachineInstr::mmo_iterator> MMOs =
2777 MF.extractLoadMemRefs(cast<MachineSDNode>(N)->memoperands_begin(),
2778 cast<MachineSDNode>(N)->memoperands_end());
2779 if (!(*MMOs.first) &&
2780 RC == &X86::VR128RegClass &&
2781 !TM.getSubtarget<X86Subtarget>().isUnalignedMemAccessFast())
2782 // Do not introduce a slow unaligned load.
2784 bool isAligned = (*MMOs.first) && (*MMOs.first)->getAlignment() >= 16;
2785 Load = DAG.getMachineNode(getLoadRegOpcode(0, RC, isAligned, TM), dl,
2786 VT, MVT::Other, &AddrOps[0], AddrOps.size());
2787 NewNodes.push_back(Load);
2789 // Preserve memory reference information.
2790 cast<MachineSDNode>(Load)->setMemRefs(MMOs.first, MMOs.second);
2793 // Emit the data processing instruction.
2794 std::vector<EVT> VTs;
2795 const TargetRegisterClass *DstRC = 0;
2796 if (MCID.getNumDefs() > 0) {
2797 DstRC = getRegClass(MCID, 0, &RI);
2798 VTs.push_back(*DstRC->vt_begin());
2800 for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) {
2801 EVT VT = N->getValueType(i);
2802 if (VT != MVT::Other && i >= (unsigned)MCID.getNumDefs())
2806 BeforeOps.push_back(SDValue(Load, 0));
2807 std::copy(AfterOps.begin(), AfterOps.end(), std::back_inserter(BeforeOps));
2808 SDNode *NewNode= DAG.getMachineNode(Opc, dl, VTs, &BeforeOps[0],
2810 NewNodes.push_back(NewNode);
2812 // Emit the store instruction.
2815 AddrOps.push_back(SDValue(NewNode, 0));
2816 AddrOps.push_back(Chain);
2817 std::pair<MachineInstr::mmo_iterator,
2818 MachineInstr::mmo_iterator> MMOs =
2819 MF.extractStoreMemRefs(cast<MachineSDNode>(N)->memoperands_begin(),
2820 cast<MachineSDNode>(N)->memoperands_end());
2821 if (!(*MMOs.first) &&
2822 RC == &X86::VR128RegClass &&
2823 !TM.getSubtarget<X86Subtarget>().isUnalignedMemAccessFast())
2824 // Do not introduce a slow unaligned store.
2826 bool isAligned = (*MMOs.first) && (*MMOs.first)->getAlignment() >= 16;
2827 SDNode *Store = DAG.getMachineNode(getStoreRegOpcode(0, DstRC,
2830 &AddrOps[0], AddrOps.size());
2831 NewNodes.push_back(Store);
2833 // Preserve memory reference information.
2834 cast<MachineSDNode>(Load)->setMemRefs(MMOs.first, MMOs.second);
2840 unsigned X86InstrInfo::getOpcodeAfterMemoryUnfold(unsigned Opc,
2841 bool UnfoldLoad, bool UnfoldStore,
2842 unsigned *LoadRegIndex) const {
2843 DenseMap<unsigned, std::pair<unsigned,unsigned> >::const_iterator I =
2844 MemOp2RegOpTable.find(Opc);
2845 if (I == MemOp2RegOpTable.end())
2847 bool FoldedLoad = I->second.second & (1 << 4);
2848 bool FoldedStore = I->second.second & (1 << 5);
2849 if (UnfoldLoad && !FoldedLoad)
2851 if (UnfoldStore && !FoldedStore)
2854 *LoadRegIndex = I->second.second & 0xf;
2855 return I->second.first;
2859 X86InstrInfo::areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2,
2860 int64_t &Offset1, int64_t &Offset2) const {
2861 if (!Load1->isMachineOpcode() || !Load2->isMachineOpcode())
2863 unsigned Opc1 = Load1->getMachineOpcode();
2864 unsigned Opc2 = Load2->getMachineOpcode();
2866 default: return false;
2876 case X86::MMX_MOVD64rm:
2877 case X86::MMX_MOVQ64rm:
2878 case X86::FsMOVAPSrm:
2879 case X86::FsMOVAPDrm:
2885 case X86::VMOVAPSYrm:
2886 case X86::VMOVUPSYrm:
2887 case X86::VMOVAPDYrm:
2888 case X86::VMOVDQAYrm:
2889 case X86::VMOVDQUYrm:
2893 default: return false;
2903 case X86::MMX_MOVD64rm:
2904 case X86::MMX_MOVQ64rm:
2905 case X86::FsMOVAPSrm:
2906 case X86::FsMOVAPDrm:
2912 case X86::VMOVAPSYrm:
2913 case X86::VMOVUPSYrm:
2914 case X86::VMOVAPDYrm:
2915 case X86::VMOVDQAYrm:
2916 case X86::VMOVDQUYrm:
2920 // Check if chain operands and base addresses match.
2921 if (Load1->getOperand(0) != Load2->getOperand(0) ||
2922 Load1->getOperand(5) != Load2->getOperand(5))
2924 // Segment operands should match as well.
2925 if (Load1->getOperand(4) != Load2->getOperand(4))
2927 // Scale should be 1, Index should be Reg0.
2928 if (Load1->getOperand(1) == Load2->getOperand(1) &&
2929 Load1->getOperand(2) == Load2->getOperand(2)) {
2930 if (cast<ConstantSDNode>(Load1->getOperand(1))->getZExtValue() != 1)
2933 // Now let's examine the displacements.
2934 if (isa<ConstantSDNode>(Load1->getOperand(3)) &&
2935 isa<ConstantSDNode>(Load2->getOperand(3))) {
2936 Offset1 = cast<ConstantSDNode>(Load1->getOperand(3))->getSExtValue();
2937 Offset2 = cast<ConstantSDNode>(Load2->getOperand(3))->getSExtValue();
2944 bool X86InstrInfo::shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
2945 int64_t Offset1, int64_t Offset2,
2946 unsigned NumLoads) const {
2947 assert(Offset2 > Offset1);
2948 if ((Offset2 - Offset1) / 8 > 64)
2951 unsigned Opc1 = Load1->getMachineOpcode();
2952 unsigned Opc2 = Load2->getMachineOpcode();
2954 return false; // FIXME: overly conservative?
2961 case X86::MMX_MOVD64rm:
2962 case X86::MMX_MOVQ64rm:
2966 EVT VT = Load1->getValueType(0);
2967 switch (VT.getSimpleVT().SimpleTy) {
2969 // XMM registers. In 64-bit mode we can be a bit more aggressive since we
2970 // have 16 of them to play with.
2971 if (TM.getSubtargetImpl()->is64Bit()) {
2974 } else if (NumLoads) {
2994 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
2995 assert(Cond.size() == 1 && "Invalid X86 branch condition!");
2996 X86::CondCode CC = static_cast<X86::CondCode>(Cond[0].getImm());
2997 if (CC == X86::COND_NE_OR_P || CC == X86::COND_NP_OR_E)
2999 Cond[0].setImm(GetOppositeBranchCondition(CC));
3004 isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const {
3005 // FIXME: Return false for x87 stack register classes for now. We can't
3006 // allow any loads of these registers before FpGet_ST0_80.
3007 return !(RC == &X86::CCRRegClass || RC == &X86::RFP32RegClass ||
3008 RC == &X86::RFP64RegClass || RC == &X86::RFP80RegClass);
3012 /// isX86_64ExtendedReg - Is the MachineOperand a x86-64 extended (r8 or higher)
3013 /// register? e.g. r8, xmm8, xmm13, etc.
3014 bool X86InstrInfo::isX86_64ExtendedReg(unsigned RegNo) {
3017 case X86::R8: case X86::R9: case X86::R10: case X86::R11:
3018 case X86::R12: case X86::R13: case X86::R14: case X86::R15:
3019 case X86::R8D: case X86::R9D: case X86::R10D: case X86::R11D:
3020 case X86::R12D: case X86::R13D: case X86::R14D: case X86::R15D:
3021 case X86::R8W: case X86::R9W: case X86::R10W: case X86::R11W:
3022 case X86::R12W: case X86::R13W: case X86::R14W: case X86::R15W:
3023 case X86::R8B: case X86::R9B: case X86::R10B: case X86::R11B:
3024 case X86::R12B: case X86::R13B: case X86::R14B: case X86::R15B:
3025 case X86::XMM8: case X86::XMM9: case X86::XMM10: case X86::XMM11:
3026 case X86::XMM12: case X86::XMM13: case X86::XMM14: case X86::XMM15:
3027 case X86::YMM8: case X86::YMM9: case X86::YMM10: case X86::YMM11:
3028 case X86::YMM12: case X86::YMM13: case X86::YMM14: case X86::YMM15:
3029 case X86::CR8: case X86::CR9: case X86::CR10: case X86::CR11:
3030 case X86::CR12: case X86::CR13: case X86::CR14: case X86::CR15:
3036 /// getGlobalBaseReg - Return a virtual register initialized with the
3037 /// the global base register value. Output instructions required to
3038 /// initialize the register in the function entry block, if necessary.
3040 /// TODO: Eliminate this and move the code to X86MachineFunctionInfo.
3042 unsigned X86InstrInfo::getGlobalBaseReg(MachineFunction *MF) const {
3043 assert(!TM.getSubtarget<X86Subtarget>().is64Bit() &&
3044 "X86-64 PIC uses RIP relative addressing");
3046 X86MachineFunctionInfo *X86FI = MF->getInfo<X86MachineFunctionInfo>();
3047 unsigned GlobalBaseReg = X86FI->getGlobalBaseReg();
3048 if (GlobalBaseReg != 0)
3049 return GlobalBaseReg;
3051 // Create the register. The code to initialize it is inserted
3052 // later, by the CGBR pass (below).
3053 MachineRegisterInfo &RegInfo = MF->getRegInfo();
3054 GlobalBaseReg = RegInfo.createVirtualRegister(X86::GR32RegisterClass);
3055 X86FI->setGlobalBaseReg(GlobalBaseReg);
3056 return GlobalBaseReg;
3059 // These are the replaceable SSE instructions. Some of these have Int variants
3060 // that we don't include here. We don't want to replace instructions selected
3062 static const unsigned ReplaceableInstrs[][3] = {
3063 //PackedSingle PackedDouble PackedInt
3064 { X86::MOVAPSmr, X86::MOVAPDmr, X86::MOVDQAmr },
3065 { X86::MOVAPSrm, X86::MOVAPDrm, X86::MOVDQArm },
3066 { X86::MOVAPSrr, X86::MOVAPDrr, X86::MOVDQArr },
3067 { X86::MOVUPSmr, X86::MOVUPDmr, X86::MOVDQUmr },
3068 { X86::MOVUPSrm, X86::MOVUPDrm, X86::MOVDQUrm },
3069 { X86::MOVNTPSmr, X86::MOVNTPDmr, X86::MOVNTDQmr },
3070 { X86::ANDNPSrm, X86::ANDNPDrm, X86::PANDNrm },
3071 { X86::ANDNPSrr, X86::ANDNPDrr, X86::PANDNrr },
3072 { X86::ANDPSrm, X86::ANDPDrm, X86::PANDrm },
3073 { X86::ANDPSrr, X86::ANDPDrr, X86::PANDrr },
3074 { X86::ORPSrm, X86::ORPDrm, X86::PORrm },
3075 { X86::ORPSrr, X86::ORPDrr, X86::PORrr },
3076 { X86::V_SET0PS, X86::V_SET0PD, X86::V_SET0PI },
3077 { X86::XORPSrm, X86::XORPDrm, X86::PXORrm },
3078 { X86::XORPSrr, X86::XORPDrr, X86::PXORrr },
3079 // AVX 128-bit support
3080 { X86::VMOVAPSmr, X86::VMOVAPDmr, X86::VMOVDQAmr },
3081 { X86::VMOVAPSrm, X86::VMOVAPDrm, X86::VMOVDQArm },
3082 { X86::VMOVAPSrr, X86::VMOVAPDrr, X86::VMOVDQArr },
3083 { X86::VMOVUPSmr, X86::VMOVUPDmr, X86::VMOVDQUmr },
3084 { X86::VMOVUPSrm, X86::VMOVUPDrm, X86::VMOVDQUrm },
3085 { X86::VMOVNTPSmr, X86::VMOVNTPDmr, X86::VMOVNTDQmr },
3086 { X86::VANDNPSrm, X86::VANDNPDrm, X86::VPANDNrm },
3087 { X86::VANDNPSrr, X86::VANDNPDrr, X86::VPANDNrr },
3088 { X86::VANDPSrm, X86::VANDPDrm, X86::VPANDrm },
3089 { X86::VANDPSrr, X86::VANDPDrr, X86::VPANDrr },
3090 { X86::VORPSrm, X86::VORPDrm, X86::VPORrm },
3091 { X86::VORPSrr, X86::VORPDrr, X86::VPORrr },
3092 { X86::AVX_SET0PS, X86::AVX_SET0PD, X86::AVX_SET0PI },
3093 { X86::VXORPSrm, X86::VXORPDrm, X86::VPXORrm },
3094 { X86::VXORPSrr, X86::VXORPDrr, X86::VPXORrr },
3095 // AVX 256-bit support
3096 { X86::VMOVAPSYmr, X86::VMOVAPDYmr, X86::VMOVDQAYmr },
3097 { X86::VMOVAPSYrm, X86::VMOVAPDYrm, X86::VMOVDQAYrm },
3098 { X86::VMOVAPSYrr, X86::VMOVAPDYrr, X86::VMOVDQAYrr },
3099 { X86::VMOVUPSYmr, X86::VMOVUPDYmr, X86::VMOVDQUYmr },
3100 { X86::VMOVUPSYrm, X86::VMOVUPDYrm, X86::VMOVDQUYrm },
3101 { X86::VMOVNTPSYmr, X86::VMOVNTPDYmr, X86::VMOVNTDQYmr },
3104 // FIXME: Some shuffle and unpack instructions have equivalents in different
3105 // domains, but they require a bit more work than just switching opcodes.
3107 static const unsigned *lookup(unsigned opcode, unsigned domain) {
3108 for (unsigned i = 0, e = array_lengthof(ReplaceableInstrs); i != e; ++i)
3109 if (ReplaceableInstrs[i][domain-1] == opcode)
3110 return ReplaceableInstrs[i];
3114 std::pair<uint16_t, uint16_t>
3115 X86InstrInfo::GetSSEDomain(const MachineInstr *MI) const {
3116 uint16_t domain = (MI->getDesc().TSFlags >> X86II::SSEDomainShift) & 3;
3117 return std::make_pair(domain,
3118 domain && lookup(MI->getOpcode(), domain) ? 0xe : 0);
3121 void X86InstrInfo::SetSSEDomain(MachineInstr *MI, unsigned Domain) const {
3122 assert(Domain>0 && Domain<4 && "Invalid execution domain");
3123 uint16_t dom = (MI->getDesc().TSFlags >> X86II::SSEDomainShift) & 3;
3124 assert(dom && "Not an SSE instruction");
3125 const unsigned *table = lookup(MI->getOpcode(), dom);
3126 assert(table && "Cannot change domain");
3127 MI->setDesc(get(table[Domain-1]));
3130 /// getNoopForMachoTarget - Return the noop instruction to use for a noop.
3131 void X86InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
3132 NopInst.setOpcode(X86::NOOP);
3135 bool X86InstrInfo::isHighLatencyDef(int opc) const {
3137 default: return false;
3139 case X86::DIVSDrm_Int:
3141 case X86::DIVSDrr_Int:
3143 case X86::DIVSSrm_Int:
3145 case X86::DIVSSrr_Int:
3147 case X86::SQRTPDm_Int:
3149 case X86::SQRTPDr_Int:
3151 case X86::SQRTPSm_Int:
3153 case X86::SQRTPSr_Int:
3155 case X86::SQRTSDm_Int:
3157 case X86::SQRTSDr_Int:
3159 case X86::SQRTSSm_Int:
3161 case X86::SQRTSSr_Int:
3167 hasHighOperandLatency(const InstrItineraryData *ItinData,
3168 const MachineRegisterInfo *MRI,
3169 const MachineInstr *DefMI, unsigned DefIdx,
3170 const MachineInstr *UseMI, unsigned UseIdx) const {
3171 return isHighLatencyDef(DefMI->getOpcode());
3175 /// CGBR - Create Global Base Reg pass. This initializes the PIC
3176 /// global base register for x86-32.
3177 struct CGBR : public MachineFunctionPass {
3179 CGBR() : MachineFunctionPass(ID) {}
3181 virtual bool runOnMachineFunction(MachineFunction &MF) {
3182 const X86TargetMachine *TM =
3183 static_cast<const X86TargetMachine *>(&MF.getTarget());
3185 assert(!TM->getSubtarget<X86Subtarget>().is64Bit() &&
3186 "X86-64 PIC uses RIP relative addressing");
3188 // Only emit a global base reg in PIC mode.
3189 if (TM->getRelocationModel() != Reloc::PIC_)
3192 X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
3193 unsigned GlobalBaseReg = X86FI->getGlobalBaseReg();
3195 // If we didn't need a GlobalBaseReg, don't insert code.
3196 if (GlobalBaseReg == 0)
3199 // Insert the set of GlobalBaseReg into the first MBB of the function
3200 MachineBasicBlock &FirstMBB = MF.front();
3201 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
3202 DebugLoc DL = FirstMBB.findDebugLoc(MBBI);
3203 MachineRegisterInfo &RegInfo = MF.getRegInfo();
3204 const X86InstrInfo *TII = TM->getInstrInfo();
3207 if (TM->getSubtarget<X86Subtarget>().isPICStyleGOT())
3208 PC = RegInfo.createVirtualRegister(X86::GR32RegisterClass);
3212 // Operand of MovePCtoStack is completely ignored by asm printer. It's
3213 // only used in JIT code emission as displacement to pc.
3214 BuildMI(FirstMBB, MBBI, DL, TII->get(X86::MOVPC32r), PC).addImm(0);
3216 // If we're using vanilla 'GOT' PIC style, we should use relative addressing
3217 // not to pc, but to _GLOBAL_OFFSET_TABLE_ external.
3218 if (TM->getSubtarget<X86Subtarget>().isPICStyleGOT()) {
3219 // Generate addl $__GLOBAL_OFFSET_TABLE_ + [.-piclabel], %some_register
3220 BuildMI(FirstMBB, MBBI, DL, TII->get(X86::ADD32ri), GlobalBaseReg)
3221 .addReg(PC).addExternalSymbol("_GLOBAL_OFFSET_TABLE_",
3222 X86II::MO_GOT_ABSOLUTE_ADDRESS);
3228 virtual const char *getPassName() const {
3229 return "X86 PIC Global Base Reg Initialization";
3232 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
3233 AU.setPreservesCFG();
3234 MachineFunctionPass::getAnalysisUsage(AU);
3241 llvm::createGlobalBaseRegPass() { return new CGBR(); }