1 //===- X86RegisterInfo.cpp - X86 Register 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 TargetRegisterInfo class.
11 // This file is responsible for the frame pointer elimination optimization
14 //===----------------------------------------------------------------------===//
17 #include "X86RegisterInfo.h"
18 #include "X86InstrBuilder.h"
19 #include "X86MachineFunctionInfo.h"
20 #include "X86Subtarget.h"
21 #include "X86TargetMachine.h"
22 #include "llvm/Constants.h"
23 #include "llvm/Function.h"
24 #include "llvm/Type.h"
25 #include "llvm/CodeGen/ValueTypes.h"
26 #include "llvm/CodeGen/MachineInstrBuilder.h"
27 #include "llvm/CodeGen/MachineFunction.h"
28 #include "llvm/CodeGen/MachineFunctionPass.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineLocation.h"
31 #include "llvm/CodeGen/MachineModuleInfo.h"
32 #include "llvm/CodeGen/MachineRegisterInfo.h"
33 #include "llvm/MC/MCAsmInfo.h"
34 #include "llvm/Target/TargetFrameInfo.h"
35 #include "llvm/Target/TargetInstrInfo.h"
36 #include "llvm/Target/TargetMachine.h"
37 #include "llvm/Target/TargetOptions.h"
38 #include "llvm/ADT/BitVector.h"
39 #include "llvm/ADT/STLExtras.h"
40 #include "llvm/Support/CommandLine.h"
41 #include "llvm/Support/ErrorHandling.h"
44 X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
45 const TargetInstrInfo &tii)
46 : X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit() ?
47 X86::ADJCALLSTACKDOWN64 :
48 X86::ADJCALLSTACKDOWN32,
49 tm.getSubtarget<X86Subtarget>().is64Bit() ?
50 X86::ADJCALLSTACKUP64 :
51 X86::ADJCALLSTACKUP32),
53 // Cache some information.
54 const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
55 Is64Bit = Subtarget->is64Bit();
56 IsWin64 = Subtarget->isTargetWin64();
57 StackAlign = TM.getFrameInfo()->getStackAlignment();
70 /// getDwarfRegNum - This function maps LLVM register identifiers to the DWARF
71 /// specific numbering, used in debug info and exception tables.
72 int X86RegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const {
73 const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
74 unsigned Flavour = DWARFFlavour::X86_64;
76 if (!Subtarget->is64Bit()) {
77 if (Subtarget->isTargetDarwin()) {
79 Flavour = DWARFFlavour::X86_32_DarwinEH;
81 Flavour = DWARFFlavour::X86_32_Generic;
82 } else if (Subtarget->isTargetCygMing()) {
83 // Unsupported by now, just quick fallback
84 Flavour = DWARFFlavour::X86_32_Generic;
86 Flavour = DWARFFlavour::X86_32_Generic;
90 return X86GenRegisterInfo::getDwarfRegNumFull(RegNo, Flavour);
93 /// getX86RegNum - This function maps LLVM register identifiers to their X86
94 /// specific numbering, which is used in various places encoding instructions.
95 unsigned X86RegisterInfo::getX86RegNum(unsigned RegNo) {
97 case X86::RAX: case X86::EAX: case X86::AX: case X86::AL: return N86::EAX;
98 case X86::RCX: case X86::ECX: case X86::CX: case X86::CL: return N86::ECX;
99 case X86::RDX: case X86::EDX: case X86::DX: case X86::DL: return N86::EDX;
100 case X86::RBX: case X86::EBX: case X86::BX: case X86::BL: return N86::EBX;
101 case X86::RSP: case X86::ESP: case X86::SP: case X86::SPL: case X86::AH:
103 case X86::RBP: case X86::EBP: case X86::BP: case X86::BPL: case X86::CH:
105 case X86::RSI: case X86::ESI: case X86::SI: case X86::SIL: case X86::DH:
107 case X86::RDI: case X86::EDI: case X86::DI: case X86::DIL: case X86::BH:
110 case X86::R8: case X86::R8D: case X86::R8W: case X86::R8B:
112 case X86::R9: case X86::R9D: case X86::R9W: case X86::R9B:
114 case X86::R10: case X86::R10D: case X86::R10W: case X86::R10B:
116 case X86::R11: case X86::R11D: case X86::R11W: case X86::R11B:
118 case X86::R12: case X86::R12D: case X86::R12W: case X86::R12B:
120 case X86::R13: case X86::R13D: case X86::R13W: case X86::R13B:
122 case X86::R14: case X86::R14D: case X86::R14W: case X86::R14B:
124 case X86::R15: case X86::R15D: case X86::R15W: case X86::R15B:
127 case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3:
128 case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
129 return RegNo-X86::ST0;
131 case X86::XMM0: case X86::XMM8: case X86::MM0:
133 case X86::XMM1: case X86::XMM9: case X86::MM1:
135 case X86::XMM2: case X86::XMM10: case X86::MM2:
137 case X86::XMM3: case X86::XMM11: case X86::MM3:
139 case X86::XMM4: case X86::XMM12: case X86::MM4:
141 case X86::XMM5: case X86::XMM13: case X86::MM5:
143 case X86::XMM6: case X86::XMM14: case X86::MM6:
145 case X86::XMM7: case X86::XMM15: case X86::MM7:
149 assert(isVirtualRegister(RegNo) && "Unknown physical register!");
150 llvm_unreachable("Register allocator hasn't allocated reg correctly yet!");
155 const TargetRegisterClass *
156 X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
157 const TargetRegisterClass *B,
158 unsigned SubIdx) const {
163 if (B == &X86::GR8RegClass) {
164 if (A->getSize() == 2 || A->getSize() == 4 || A->getSize() == 8)
166 } else if (B == &X86::GR8_ABCD_LRegClass || B == &X86::GR8_ABCD_HRegClass) {
167 if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
168 A == &X86::GR64_NOREXRegClass ||
169 A == &X86::GR64_NOSPRegClass ||
170 A == &X86::GR64_NOREX_NOSPRegClass)
171 return &X86::GR64_ABCDRegClass;
172 else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
173 A == &X86::GR32_NOREXRegClass ||
174 A == &X86::GR32_NOSPRegClass)
175 return &X86::GR32_ABCDRegClass;
176 else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
177 A == &X86::GR16_NOREXRegClass)
178 return &X86::GR16_ABCDRegClass;
179 } else if (B == &X86::GR8_NOREXRegClass) {
180 if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
181 A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
182 return &X86::GR64_NOREXRegClass;
183 else if (A == &X86::GR64_ABCDRegClass)
184 return &X86::GR64_ABCDRegClass;
185 else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass ||
186 A == &X86::GR32_NOSPRegClass)
187 return &X86::GR32_NOREXRegClass;
188 else if (A == &X86::GR32_ABCDRegClass)
189 return &X86::GR32_ABCDRegClass;
190 else if (A == &X86::GR16RegClass || A == &X86::GR16_NOREXRegClass)
191 return &X86::GR16_NOREXRegClass;
192 else if (A == &X86::GR16_ABCDRegClass)
193 return &X86::GR16_ABCDRegClass;
198 if (B == &X86::GR8_ABCD_HRegClass) {
199 if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
200 A == &X86::GR64_NOREXRegClass ||
201 A == &X86::GR64_NOSPRegClass ||
202 A == &X86::GR64_NOREX_NOSPRegClass)
203 return &X86::GR64_ABCDRegClass;
204 else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
205 A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass)
206 return &X86::GR32_ABCDRegClass;
207 else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
208 A == &X86::GR16_NOREXRegClass)
209 return &X86::GR16_ABCDRegClass;
214 if (B == &X86::GR16RegClass) {
215 if (A->getSize() == 4 || A->getSize() == 8)
217 } else if (B == &X86::GR16_ABCDRegClass) {
218 if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
219 A == &X86::GR64_NOREXRegClass ||
220 A == &X86::GR64_NOSPRegClass ||
221 A == &X86::GR64_NOREX_NOSPRegClass)
222 return &X86::GR64_ABCDRegClass;
223 else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
224 A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass)
225 return &X86::GR32_ABCDRegClass;
226 } else if (B == &X86::GR16_NOREXRegClass) {
227 if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
228 A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
229 return &X86::GR64_NOREXRegClass;
230 else if (A == &X86::GR64_ABCDRegClass)
231 return &X86::GR64_ABCDRegClass;
232 else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass ||
233 A == &X86::GR32_NOSPRegClass)
234 return &X86::GR32_NOREXRegClass;
235 else if (A == &X86::GR32_ABCDRegClass)
236 return &X86::GR64_ABCDRegClass;
241 if (B == &X86::GR32RegClass || B == &X86::GR32_NOSPRegClass) {
242 if (A->getSize() == 8)
244 } else if (B == &X86::GR32_ABCDRegClass) {
245 if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
246 A == &X86::GR64_NOREXRegClass ||
247 A == &X86::GR64_NOSPRegClass ||
248 A == &X86::GR64_NOREX_NOSPRegClass)
249 return &X86::GR64_ABCDRegClass;
250 } else if (B == &X86::GR32_NOREXRegClass) {
251 if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
252 A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
253 return &X86::GR64_NOREXRegClass;
254 else if (A == &X86::GR64_ABCDRegClass)
255 return &X86::GR64_ABCDRegClass;
262 const TargetRegisterClass *
263 X86RegisterInfo::getPointerRegClass(unsigned Kind) const {
265 default: llvm_unreachable("Unexpected Kind in getPointerRegClass!");
266 case 0: // Normal GPRs.
267 if (TM.getSubtarget<X86Subtarget>().is64Bit())
268 return &X86::GR64RegClass;
269 return &X86::GR32RegClass;
270 case 1: // Normal GRPs except the stack pointer (for encoding reasons).
271 if (TM.getSubtarget<X86Subtarget>().is64Bit())
272 return &X86::GR64_NOSPRegClass;
273 return &X86::GR32_NOSPRegClass;
277 const TargetRegisterClass *
278 X86RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const {
279 if (RC == &X86::CCRRegClass) {
281 return &X86::GR64RegClass;
283 return &X86::GR32RegClass;
289 X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
290 bool callsEHReturn = false;
293 const MachineFrameInfo *MFI = MF->getFrameInfo();
294 const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
295 callsEHReturn = (MMI ? MMI->callsEHReturn() : false);
298 static const unsigned CalleeSavedRegs32Bit[] = {
299 X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0
302 static const unsigned CalleeSavedRegs32EHRet[] = {
303 X86::EAX, X86::EDX, X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0
306 static const unsigned CalleeSavedRegs64Bit[] = {
307 X86::RBX, X86::R12, X86::R13, X86::R14, X86::R15, X86::RBP, 0
310 static const unsigned CalleeSavedRegs64EHRet[] = {
311 X86::RAX, X86::RDX, X86::RBX, X86::R12,
312 X86::R13, X86::R14, X86::R15, X86::RBP, 0
315 static const unsigned CalleeSavedRegsWin64[] = {
316 X86::RBX, X86::RBP, X86::RDI, X86::RSI,
317 X86::R12, X86::R13, X86::R14, X86::R15,
318 X86::XMM6, X86::XMM7, X86::XMM8, X86::XMM9,
319 X86::XMM10, X86::XMM11, X86::XMM12, X86::XMM13,
320 X86::XMM14, X86::XMM15, 0
325 return CalleeSavedRegsWin64;
327 return (callsEHReturn ? CalleeSavedRegs64EHRet : CalleeSavedRegs64Bit);
329 return (callsEHReturn ? CalleeSavedRegs32EHRet : CalleeSavedRegs32Bit);
333 const TargetRegisterClass* const*
334 X86RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
335 bool callsEHReturn = false;
338 const MachineFrameInfo *MFI = MF->getFrameInfo();
339 const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
340 callsEHReturn = (MMI ? MMI->callsEHReturn() : false);
343 static const TargetRegisterClass * const CalleeSavedRegClasses32Bit[] = {
344 &X86::GR32RegClass, &X86::GR32RegClass,
345 &X86::GR32RegClass, &X86::GR32RegClass, 0
347 static const TargetRegisterClass * const CalleeSavedRegClasses32EHRet[] = {
348 &X86::GR32RegClass, &X86::GR32RegClass,
349 &X86::GR32RegClass, &X86::GR32RegClass,
350 &X86::GR32RegClass, &X86::GR32RegClass, 0
352 static const TargetRegisterClass * const CalleeSavedRegClasses64Bit[] = {
353 &X86::GR64RegClass, &X86::GR64RegClass,
354 &X86::GR64RegClass, &X86::GR64RegClass,
355 &X86::GR64RegClass, &X86::GR64RegClass, 0
357 static const TargetRegisterClass * const CalleeSavedRegClasses64EHRet[] = {
358 &X86::GR64RegClass, &X86::GR64RegClass,
359 &X86::GR64RegClass, &X86::GR64RegClass,
360 &X86::GR64RegClass, &X86::GR64RegClass,
361 &X86::GR64RegClass, &X86::GR64RegClass, 0
363 static const TargetRegisterClass * const CalleeSavedRegClassesWin64[] = {
364 &X86::GR64RegClass, &X86::GR64RegClass,
365 &X86::GR64RegClass, &X86::GR64RegClass,
366 &X86::GR64RegClass, &X86::GR64RegClass,
367 &X86::GR64RegClass, &X86::GR64RegClass,
368 &X86::VR128RegClass, &X86::VR128RegClass,
369 &X86::VR128RegClass, &X86::VR128RegClass,
370 &X86::VR128RegClass, &X86::VR128RegClass,
371 &X86::VR128RegClass, &X86::VR128RegClass,
372 &X86::VR128RegClass, &X86::VR128RegClass, 0
377 return CalleeSavedRegClassesWin64;
379 return (callsEHReturn ?
380 CalleeSavedRegClasses64EHRet : CalleeSavedRegClasses64Bit);
382 return (callsEHReturn ?
383 CalleeSavedRegClasses32EHRet : CalleeSavedRegClasses32Bit);
387 BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
388 BitVector Reserved(getNumRegs());
389 // Set the stack-pointer register and its aliases as reserved.
390 Reserved.set(X86::RSP);
391 Reserved.set(X86::ESP);
392 Reserved.set(X86::SP);
393 Reserved.set(X86::SPL);
395 // Set the instruction pointer register and its aliases as reserved.
396 Reserved.set(X86::RIP);
397 Reserved.set(X86::EIP);
398 Reserved.set(X86::IP);
400 // Set the frame-pointer register and its aliases as reserved if needed.
402 Reserved.set(X86::RBP);
403 Reserved.set(X86::EBP);
404 Reserved.set(X86::BP);
405 Reserved.set(X86::BPL);
408 // Mark the x87 stack registers as reserved, since they don't behave normally
409 // with respect to liveness. We don't fully model the effects of x87 stack
410 // pushes and pops after stackification.
411 Reserved.set(X86::ST0);
412 Reserved.set(X86::ST1);
413 Reserved.set(X86::ST2);
414 Reserved.set(X86::ST3);
415 Reserved.set(X86::ST4);
416 Reserved.set(X86::ST5);
417 Reserved.set(X86::ST6);
418 Reserved.set(X86::ST7);
422 //===----------------------------------------------------------------------===//
423 // Stack Frame Processing methods
424 //===----------------------------------------------------------------------===//
426 /// hasFP - Return true if the specified function should have a dedicated frame
427 /// pointer register. This is true if the function has variable sized allocas
428 /// or if frame pointer elimination is disabled.
429 bool X86RegisterInfo::hasFP(const MachineFunction &MF) const {
430 const MachineFrameInfo *MFI = MF.getFrameInfo();
431 const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
433 return (NoFramePointerElim ||
434 needsStackRealignment(MF) ||
435 MFI->hasVarSizedObjects() ||
436 MFI->isFrameAddressTaken() ||
437 MF.getInfo<X86MachineFunctionInfo>()->getForceFramePointer() ||
438 (MMI && MMI->callsUnwindInit()));
441 bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
442 const MachineFrameInfo *MFI = MF.getFrameInfo();
443 return (RealignStack &&
444 !MFI->hasVarSizedObjects());
447 bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
448 const MachineFrameInfo *MFI = MF.getFrameInfo();
449 const Function *F = MF.getFunction();
450 bool requiresRealignment =
451 RealignStack && ((MFI->getMaxAlignment() > StackAlign) ||
452 F->hasFnAttr(Attribute::StackAlignment));
454 // FIXME: Currently we don't support stack realignment for functions with
455 // variable-sized allocas.
456 // FIXME: Temporary disable the error - it seems to be too conservative.
457 if (0 && requiresRealignment && MFI->hasVarSizedObjects())
459 "Stack realignment in presense of dynamic allocas is not supported");
461 return (requiresRealignment && !MFI->hasVarSizedObjects());
464 bool X86RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
465 return !MF.getFrameInfo()->hasVarSizedObjects();
468 bool X86RegisterInfo::hasReservedSpillSlot(MachineFunction &MF, unsigned Reg,
469 int &FrameIdx) const {
470 if (Reg == FramePtr && hasFP(MF)) {
471 FrameIdx = MF.getFrameInfo()->getObjectIndexBegin();
478 X86RegisterInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const {
479 const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
480 const MachineFrameInfo *MFI = MF.getFrameInfo();
481 int Offset = MFI->getObjectOffset(FI) - TFI.getOffsetOfLocalArea();
482 uint64_t StackSize = MFI->getStackSize();
484 if (needsStackRealignment(MF)) {
486 // Skip the saved EBP.
489 unsigned Align = MFI->getObjectAlignment(FI);
490 assert((-(Offset + StackSize)) % Align == 0);
492 return Offset + StackSize;
494 // FIXME: Support tail calls
497 return Offset + StackSize;
499 // Skip the saved EBP.
502 // Skip the RETADDR move area
503 const X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
504 int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
505 if (TailCallReturnAddrDelta < 0)
506 Offset -= TailCallReturnAddrDelta;
512 void X86RegisterInfo::
513 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
514 MachineBasicBlock::iterator I) const {
515 if (!hasReservedCallFrame(MF)) {
516 // If the stack pointer can be changed after prologue, turn the
517 // adjcallstackup instruction into a 'sub ESP, <amt>' and the
518 // adjcallstackdown instruction into 'add ESP, <amt>'
519 // TODO: consider using push / pop instead of sub + store / add
520 MachineInstr *Old = I;
521 uint64_t Amount = Old->getOperand(0).getImm();
523 // We need to keep the stack aligned properly. To do this, we round the
524 // amount of space needed for the outgoing arguments up to the next
525 // alignment boundary.
526 Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
528 MachineInstr *New = 0;
529 if (Old->getOpcode() == getCallFrameSetupOpcode()) {
530 New = BuildMI(MF, Old->getDebugLoc(),
531 TII.get(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri),
536 assert(Old->getOpcode() == getCallFrameDestroyOpcode());
538 // Factor out the amount the callee already popped.
539 uint64_t CalleeAmt = Old->getOperand(1).getImm();
543 unsigned Opc = (Amount < 128) ?
544 (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
545 (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri);
546 New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr)
553 // The EFLAGS implicit def is dead.
554 New->getOperand(3).setIsDead();
556 // Replace the pseudo instruction with a new instruction.
560 } else if (I->getOpcode() == getCallFrameDestroyOpcode()) {
561 // If we are performing frame pointer elimination and if the callee pops
562 // something off the stack pointer, add it back. We do this until we have
563 // more advanced stack pointer tracking ability.
564 if (uint64_t CalleeAmt = I->getOperand(1).getImm()) {
565 unsigned Opc = (CalleeAmt < 128) ?
566 (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
567 (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri);
568 MachineInstr *Old = I;
570 BuildMI(MF, Old->getDebugLoc(), TII.get(Opc),
575 // The EFLAGS implicit def is dead.
576 New->getOperand(3).setIsDead();
585 X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
586 int SPAdj, int *Value,
587 RegScavenger *RS) const{
588 assert(SPAdj == 0 && "Unexpected");
591 MachineInstr &MI = *II;
592 MachineFunction &MF = *MI.getParent()->getParent();
594 while (!MI.getOperand(i).isFI()) {
596 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
599 int FrameIndex = MI.getOperand(i).getIndex();
602 if (needsStackRealignment(MF))
603 BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr);
605 BasePtr = (hasFP(MF) ? FramePtr : StackPtr);
607 // This must be part of a four operand memory reference. Replace the
608 // FrameIndex with base register with EBP. Add an offset to the offset.
609 MI.getOperand(i).ChangeToRegister(BasePtr, false);
611 // Now add the frame object offset to the offset from EBP.
612 if (MI.getOperand(i+3).isImm()) {
613 // Offset is a 32-bit integer.
614 int Offset = getFrameIndexOffset(MF, FrameIndex) +
615 (int)(MI.getOperand(i + 3).getImm());
617 MI.getOperand(i + 3).ChangeToImmediate(Offset);
619 // Offset is symbolic. This is extremely rare.
620 uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) +
621 (uint64_t)MI.getOperand(i+3).getOffset();
622 MI.getOperand(i+3).setOffset(Offset);
628 X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
629 RegScavenger *RS) const {
630 MachineFrameInfo *MFI = MF.getFrameInfo();
632 X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
633 int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
635 if (TailCallReturnAddrDelta < 0) {
636 // create RETURNADDR area
645 MFI->CreateFixedObject(-TailCallReturnAddrDelta,
646 (-1U*SlotSize)+TailCallReturnAddrDelta,
651 assert((TailCallReturnAddrDelta <= 0) &&
652 "The Delta should always be zero or negative");
653 const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
655 // Create a frame entry for the EBP register that must be saved.
656 int FrameIdx = MFI->CreateFixedObject(SlotSize,
658 TFI.getOffsetOfLocalArea() +
659 TailCallReturnAddrDelta,
661 assert(FrameIdx == MFI->getObjectIndexBegin() &&
662 "Slot for EBP register must be last in order to be found!");
667 /// emitSPUpdate - Emit a series of instructions to increment / decrement the
668 /// stack pointer by a constant value.
670 void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
671 unsigned StackPtr, int64_t NumBytes, bool Is64Bit,
672 const TargetInstrInfo &TII) {
673 bool isSub = NumBytes < 0;
674 uint64_t Offset = isSub ? -NumBytes : NumBytes;
677 (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
678 (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri))
680 (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
681 (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri));
682 uint64_t Chunk = (1LL << 31) - 1;
683 DebugLoc DL = MBB.findDebugLoc(MBBI);
686 uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset;
688 BuildMI(MBB, MBBI, DL, TII.get(Opc), StackPtr)
691 MI->getOperand(3).setIsDead(); // The EFLAGS implicit def is dead.
696 /// mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator.
698 void mergeSPUpdatesUp(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
699 unsigned StackPtr, uint64_t *NumBytes = NULL) {
700 if (MBBI == MBB.begin()) return;
702 MachineBasicBlock::iterator PI = prior(MBBI);
703 unsigned Opc = PI->getOpcode();
704 if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 ||
705 Opc == X86::ADD32ri || Opc == X86::ADD32ri8) &&
706 PI->getOperand(0).getReg() == StackPtr) {
708 *NumBytes += PI->getOperand(2).getImm();
710 } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 ||
711 Opc == X86::SUB32ri || Opc == X86::SUB32ri8) &&
712 PI->getOperand(0).getReg() == StackPtr) {
714 *NumBytes -= PI->getOperand(2).getImm();
719 /// mergeSPUpdatesUp - Merge two stack-manipulating instructions lower iterator.
721 void mergeSPUpdatesDown(MachineBasicBlock &MBB,
722 MachineBasicBlock::iterator &MBBI,
723 unsigned StackPtr, uint64_t *NumBytes = NULL) {
724 // FIXME: THIS ISN'T RUN!!!
727 if (MBBI == MBB.end()) return;
729 MachineBasicBlock::iterator NI = llvm::next(MBBI);
730 if (NI == MBB.end()) return;
732 unsigned Opc = NI->getOpcode();
733 if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 ||
734 Opc == X86::ADD32ri || Opc == X86::ADD32ri8) &&
735 NI->getOperand(0).getReg() == StackPtr) {
737 *NumBytes -= NI->getOperand(2).getImm();
740 } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 ||
741 Opc == X86::SUB32ri || Opc == X86::SUB32ri8) &&
742 NI->getOperand(0).getReg() == StackPtr) {
744 *NumBytes += NI->getOperand(2).getImm();
750 /// mergeSPUpdates - Checks the instruction before/after the passed
751 /// instruction. If it is an ADD/SUB instruction it is deleted argument and the
752 /// stack adjustment is returned as a positive value for ADD and a negative for
754 static int mergeSPUpdates(MachineBasicBlock &MBB,
755 MachineBasicBlock::iterator &MBBI,
757 bool doMergeWithPrevious) {
758 if ((doMergeWithPrevious && MBBI == MBB.begin()) ||
759 (!doMergeWithPrevious && MBBI == MBB.end()))
762 MachineBasicBlock::iterator PI = doMergeWithPrevious ? prior(MBBI) : MBBI;
763 MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : llvm::next(MBBI);
764 unsigned Opc = PI->getOpcode();
767 if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 ||
768 Opc == X86::ADD32ri || Opc == X86::ADD32ri8) &&
769 PI->getOperand(0).getReg() == StackPtr){
770 Offset += PI->getOperand(2).getImm();
772 if (!doMergeWithPrevious) MBBI = NI;
773 } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 ||
774 Opc == X86::SUB32ri || Opc == X86::SUB32ri8) &&
775 PI->getOperand(0).getReg() == StackPtr) {
776 Offset -= PI->getOperand(2).getImm();
778 if (!doMergeWithPrevious) MBBI = NI;
784 void X86RegisterInfo::emitCalleeSavedFrameMoves(MachineFunction &MF,
786 unsigned FramePtr) const {
787 MachineFrameInfo *MFI = MF.getFrameInfo();
788 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
791 // Add callee saved registers to move list.
792 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
793 if (CSI.empty()) return;
795 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
796 const TargetData *TD = MF.getTarget().getTargetData();
797 bool HasFP = hasFP(MF);
799 // Calculate amount of bytes used for return address storing.
801 (MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
802 TargetFrameInfo::StackGrowsUp ?
803 TD->getPointerSize() : -TD->getPointerSize());
805 // FIXME: This is dirty hack. The code itself is pretty mess right now.
806 // It should be rewritten from scratch and generalized sometimes.
808 // Determine maximum offset (minumum due to stack growth).
809 int64_t MaxOffset = 0;
810 for (std::vector<CalleeSavedInfo>::const_iterator
811 I = CSI.begin(), E = CSI.end(); I != E; ++I)
812 MaxOffset = std::min(MaxOffset,
813 MFI->getObjectOffset(I->getFrameIdx()));
815 // Calculate offsets.
816 int64_t saveAreaOffset = (HasFP ? 3 : 2) * stackGrowth;
817 for (std::vector<CalleeSavedInfo>::const_iterator
818 I = CSI.begin(), E = CSI.end(); I != E; ++I) {
819 int64_t Offset = MFI->getObjectOffset(I->getFrameIdx());
820 unsigned Reg = I->getReg();
821 Offset = MaxOffset - Offset + saveAreaOffset;
823 // Don't output a new machine move if we're re-saving the frame
824 // pointer. This happens when the PrologEpilogInserter has inserted an extra
825 // "PUSH" of the frame pointer -- the "emitPrologue" method automatically
826 // generates one when frame pointers are used. If we generate a "machine
827 // move" for this extra "PUSH", the linker will lose track of the fact that
828 // the frame pointer should have the value of the first "PUSH" when it's
831 // FIXME: This looks inelegant. It's possibly correct, but it's covering up
832 // another bug. I.e., one where we generate a prolog like this:
840 // The immediate re-push of EBP is unnecessary. At the least, it's an
841 // optimization bug. EBP can be used as a scratch register in certain
842 // cases, but probably not when we have a frame pointer.
843 if (HasFP && FramePtr == Reg)
846 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
847 MachineLocation CSSrc(Reg);
848 Moves.push_back(MachineMove(LabelId, CSDst, CSSrc));
852 /// emitPrologue - Push callee-saved registers onto the stack, which
853 /// automatically adjust the stack pointer. Adjust the stack pointer to allocate
854 /// space for local variables. Also emit labels used by the exception handler to
855 /// generate the exception handling frames.
856 void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
857 MachineBasicBlock &MBB = MF.front(); // Prologue goes in entry BB.
858 MachineBasicBlock::iterator MBBI = MBB.begin();
859 MachineFrameInfo *MFI = MF.getFrameInfo();
860 const Function *Fn = MF.getFunction();
861 const X86Subtarget *Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
862 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
863 X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
864 bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
865 !Fn->doesNotThrow() || UnwindTablesMandatory;
866 uint64_t MaxAlign = MFI->getMaxAlignment(); // Desired stack alignment.
867 uint64_t StackSize = MFI->getStackSize(); // Number of bytes to allocate.
868 bool HasFP = hasFP(MF);
871 // Add RETADDR move area to callee saved frame size.
872 int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
873 if (TailCallReturnAddrDelta < 0)
874 X86FI->setCalleeSavedFrameSize(
875 X86FI->getCalleeSavedFrameSize() - TailCallReturnAddrDelta);
877 // If this is x86-64 and the Red Zone is not disabled, if we are a leaf
878 // function, and use up to 128 bytes of stack space, don't have a frame
879 // pointer, calls, or dynamic alloca then we do not need to adjust the
880 // stack pointer (we fit in the Red Zone).
881 if (Is64Bit && !Fn->hasFnAttr(Attribute::NoRedZone) &&
882 !needsStackRealignment(MF) &&
883 !MFI->hasVarSizedObjects() && // No dynamic alloca.
884 !MFI->hasCalls() && // No calls.
885 !Subtarget->isTargetWin64()) { // Win64 has no Red Zone
886 uint64_t MinSize = X86FI->getCalleeSavedFrameSize();
887 if (HasFP) MinSize += SlotSize;
888 StackSize = std::max(MinSize, StackSize > 128 ? StackSize - 128 : 0);
889 MFI->setStackSize(StackSize);
890 } else if (Subtarget->isTargetWin64()) {
891 // We need to always allocate 32 bytes as register spill area.
892 // FIXME: We might reuse these 32 bytes for leaf functions.
894 MFI->setStackSize(StackSize);
897 // Insert stack pointer adjustment for later moving of return addr. Only
898 // applies to tail call optimized functions where the callee argument stack
899 // size is bigger than the callers.
900 if (TailCallReturnAddrDelta < 0) {
902 BuildMI(MBB, MBBI, DL, TII.get(Is64Bit? X86::SUB64ri32 : X86::SUB32ri),
905 .addImm(-TailCallReturnAddrDelta);
906 MI->getOperand(3).setIsDead(); // The EFLAGS implicit def is dead.
909 // Mapping for machine moves:
911 // DST: VirtualFP AND
912 // SRC: VirtualFP => DW_CFA_def_cfa_offset
913 // ELSE => DW_CFA_def_cfa
915 // SRC: VirtualFP AND
916 // DST: Register => DW_CFA_def_cfa_register
919 // OFFSET < 0 => DW_CFA_offset_extended_sf
920 // REG < 64 => DW_CFA_offset + Reg
921 // ELSE => DW_CFA_offset_extended
923 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
924 const TargetData *TD = MF.getTarget().getTargetData();
925 uint64_t NumBytes = 0;
927 (MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
928 TargetFrameInfo::StackGrowsUp ?
929 TD->getPointerSize() : -TD->getPointerSize());
932 // Calculate required stack adjustment.
933 uint64_t FrameSize = StackSize - SlotSize;
934 if (needsStackRealignment(MF))
935 FrameSize = (FrameSize + MaxAlign - 1) / MaxAlign * MaxAlign;
937 NumBytes = FrameSize - X86FI->getCalleeSavedFrameSize();
939 // Get the offset of the stack slot for the EBP register, which is
940 // guaranteed to be the last slot by processFunctionBeforeFrameFinalized.
941 // Update the frame offset adjustment.
942 MFI->setOffsetAdjustment(-NumBytes);
944 // Save EBP/RBP into the appropriate stack slot.
945 BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r))
946 .addReg(FramePtr, RegState::Kill);
948 if (needsFrameMoves) {
949 // Mark the place where EBP/RBP was saved.
950 unsigned FrameLabelId = MMI->NextLabelID();
951 BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
953 // Define the current CFA rule to use the provided offset.
955 MachineLocation SPDst(MachineLocation::VirtualFP);
956 MachineLocation SPSrc(MachineLocation::VirtualFP, 2 * stackGrowth);
957 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
959 // FIXME: Verify & implement for FP
960 MachineLocation SPDst(StackPtr);
961 MachineLocation SPSrc(StackPtr, stackGrowth);
962 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
965 // Change the rule for the FramePtr to be an "offset" rule.
966 MachineLocation FPDst(MachineLocation::VirtualFP,
968 MachineLocation FPSrc(FramePtr);
969 Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
972 // Update EBP with the new base value...
973 BuildMI(MBB, MBBI, DL,
974 TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr)
977 if (needsFrameMoves) {
978 // Mark effective beginning of when frame pointer becomes valid.
979 unsigned FrameLabelId = MMI->NextLabelID();
980 BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
982 // Define the current CFA to use the EBP/RBP register.
983 MachineLocation FPDst(FramePtr);
984 MachineLocation FPSrc(MachineLocation::VirtualFP);
985 Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
988 // Mark the FramePtr as live-in in every block except the entry.
989 for (MachineFunction::iterator I = llvm::next(MF.begin()), E = MF.end();
991 I->addLiveIn(FramePtr);
994 if (needsStackRealignment(MF)) {
996 BuildMI(MBB, MBBI, DL,
997 TII.get(Is64Bit ? X86::AND64ri32 : X86::AND32ri),
998 StackPtr).addReg(StackPtr).addImm(-MaxAlign);
1000 // The EFLAGS implicit def is dead.
1001 MI->getOperand(3).setIsDead();
1004 NumBytes = StackSize - X86FI->getCalleeSavedFrameSize();
1007 // Skip the callee-saved push instructions.
1008 bool PushedRegs = false;
1009 int StackOffset = 2 * stackGrowth;
1011 while (MBBI != MBB.end() &&
1012 (MBBI->getOpcode() == X86::PUSH32r ||
1013 MBBI->getOpcode() == X86::PUSH64r)) {
1017 if (!HasFP && needsFrameMoves) {
1018 // Mark callee-saved push instruction.
1019 unsigned LabelId = MMI->NextLabelID();
1020 BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId);
1022 // Define the current CFA rule to use the provided offset.
1023 unsigned Ptr = StackSize ?
1024 MachineLocation::VirtualFP : StackPtr;
1025 MachineLocation SPDst(Ptr);
1026 MachineLocation SPSrc(Ptr, StackOffset);
1027 Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
1028 StackOffset += stackGrowth;
1032 DL = MBB.findDebugLoc(MBBI);
1034 // Adjust stack pointer: ESP -= numbytes.
1035 if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
1036 // Check, whether EAX is livein for this function.
1037 bool isEAXAlive = false;
1038 for (MachineRegisterInfo::livein_iterator
1039 II = MF.getRegInfo().livein_begin(),
1040 EE = MF.getRegInfo().livein_end(); (II != EE) && !isEAXAlive; ++II) {
1041 unsigned Reg = II->first;
1042 isEAXAlive = (Reg == X86::EAX || Reg == X86::AX ||
1043 Reg == X86::AH || Reg == X86::AL);
1046 // Function prologue calls _alloca to probe the stack when allocating more
1047 // than 4k bytes in one go. Touching the stack at 4K increments is necessary
1048 // to ensure that the guard pages used by the OS virtual memory manager are
1049 // allocated in correct sequence.
1051 BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
1053 BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
1054 .addExternalSymbol("_alloca");
1057 BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
1058 .addReg(X86::EAX, RegState::Kill);
1060 // Allocate NumBytes-4 bytes on stack. We'll also use 4 already
1061 // allocated bytes for EAX.
1062 BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
1063 .addImm(NumBytes - 4);
1064 BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
1065 .addExternalSymbol("_alloca");
1068 MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
1070 StackPtr, false, NumBytes - 4);
1071 MBB.insert(MBBI, MI);
1073 } else if (NumBytes) {
1074 // If there is an SUB32ri of ESP immediately before this instruction, merge
1075 // the two. This can be the case when tail call elimination is enabled and
1076 // the callee has more arguments then the caller.
1077 NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true);
1079 // If there is an ADD32ri or SUB32ri of ESP immediately after this
1080 // instruction, merge the two instructions.
1081 mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes);
1084 emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
1087 if ((NumBytes || PushedRegs) && needsFrameMoves) {
1088 // Mark end of stack pointer adjustment.
1089 unsigned LabelId = MMI->NextLabelID();
1090 BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId);
1092 if (!HasFP && NumBytes) {
1093 // Define the current CFA rule to use the provided offset.
1095 MachineLocation SPDst(MachineLocation::VirtualFP);
1096 MachineLocation SPSrc(MachineLocation::VirtualFP,
1097 -StackSize + stackGrowth);
1098 Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
1100 // FIXME: Verify & implement for FP
1101 MachineLocation SPDst(StackPtr);
1102 MachineLocation SPSrc(StackPtr, stackGrowth);
1103 Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
1107 // Emit DWARF info specifying the offsets of the callee-saved registers.
1109 emitCalleeSavedFrameMoves(MF, LabelId, HasFP ? FramePtr : StackPtr);
1113 void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
1114 MachineBasicBlock &MBB) const {
1115 const MachineFrameInfo *MFI = MF.getFrameInfo();
1116 X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
1117 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1118 unsigned RetOpcode = MBBI->getOpcode();
1119 DebugLoc DL = MBBI->getDebugLoc();
1121 switch (RetOpcode) {
1123 llvm_unreachable("Can only insert epilog into returning blocks");
1126 case X86::TCRETURNdi:
1127 case X86::TCRETURNri:
1128 case X86::TCRETURNri64:
1129 case X86::TCRETURNdi64:
1130 case X86::EH_RETURN:
1131 case X86::EH_RETURN64:
1135 break; // These are ok
1138 // Get the number of bytes to allocate from the FrameInfo.
1139 uint64_t StackSize = MFI->getStackSize();
1140 uint64_t MaxAlign = MFI->getMaxAlignment();
1141 unsigned CSSize = X86FI->getCalleeSavedFrameSize();
1142 uint64_t NumBytes = 0;
1145 // Calculate required stack adjustment.
1146 uint64_t FrameSize = StackSize - SlotSize;
1147 if (needsStackRealignment(MF))
1148 FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign;
1150 NumBytes = FrameSize - CSSize;
1153 BuildMI(MBB, MBBI, DL,
1154 TII.get(Is64Bit ? X86::POP64r : X86::POP32r), FramePtr);
1156 NumBytes = StackSize - CSSize;
1159 // Skip the callee-saved pop instructions.
1160 MachineBasicBlock::iterator LastCSPop = MBBI;
1161 while (MBBI != MBB.begin()) {
1162 MachineBasicBlock::iterator PI = prior(MBBI);
1163 unsigned Opc = PI->getOpcode();
1165 if (Opc != X86::POP32r && Opc != X86::POP64r &&
1166 !PI->getDesc().isTerminator())
1172 DL = MBBI->getDebugLoc();
1174 // If there is an ADD32ri or SUB32ri of ESP immediately before this
1175 // instruction, merge the two instructions.
1176 if (NumBytes || MFI->hasVarSizedObjects())
1177 mergeSPUpdatesUp(MBB, MBBI, StackPtr, &NumBytes);
1179 // If dynamic alloca is used, then reset esp to point to the last callee-saved
1180 // slot before popping them off! Same applies for the case, when stack was
1182 if (needsStackRealignment(MF)) {
1183 // We cannot use LEA here, because stack pointer was realigned. We need to
1184 // deallocate local frame back.
1186 emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII);
1187 MBBI = prior(LastCSPop);
1190 BuildMI(MBB, MBBI, DL,
1191 TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr),
1192 StackPtr).addReg(FramePtr);
1193 } else if (MFI->hasVarSizedObjects()) {
1195 unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r;
1197 addLeaRegOffset(BuildMI(MF, DL, TII.get(Opc), StackPtr),
1198 FramePtr, false, -CSSize);
1199 MBB.insert(MBBI, MI);
1201 BuildMI(MBB, MBBI, DL,
1202 TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), StackPtr)
1205 } else if (NumBytes) {
1206 // Adjust stack pointer back: ESP += numbytes.
1207 emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII);
1210 // We're returning from function via eh_return.
1211 if (RetOpcode == X86::EH_RETURN || RetOpcode == X86::EH_RETURN64) {
1212 MBBI = prior(MBB.end());
1213 MachineOperand &DestAddr = MBBI->getOperand(0);
1214 assert(DestAddr.isReg() && "Offset should be in register!");
1215 BuildMI(MBB, MBBI, DL,
1216 TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr),
1217 StackPtr).addReg(DestAddr.getReg());
1218 } else if (RetOpcode == X86::TCRETURNri || RetOpcode == X86::TCRETURNdi ||
1219 RetOpcode== X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64) {
1220 // Tail call return: adjust the stack pointer and jump to callee.
1221 MBBI = prior(MBB.end());
1222 MachineOperand &JumpTarget = MBBI->getOperand(0);
1223 MachineOperand &StackAdjust = MBBI->getOperand(1);
1224 assert(StackAdjust.isImm() && "Expecting immediate value.");
1226 // Adjust stack pointer.
1227 int StackAdj = StackAdjust.getImm();
1228 int MaxTCDelta = X86FI->getTCReturnAddrDelta();
1230 assert(MaxTCDelta <= 0 && "MaxTCDelta should never be positive");
1232 // Incoporate the retaddr area.
1233 Offset = StackAdj-MaxTCDelta;
1234 assert(Offset >= 0 && "Offset should never be negative");
1237 // Check for possible merge with preceeding ADD instruction.
1238 Offset += mergeSPUpdates(MBB, MBBI, StackPtr, true);
1239 emitSPUpdate(MBB, MBBI, StackPtr, Offset, Is64Bit, TII);
1242 // Jump to label or value in register.
1243 if (RetOpcode == X86::TCRETURNdi|| RetOpcode == X86::TCRETURNdi64) {
1244 BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPd)).
1245 addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
1246 JumpTarget.getTargetFlags());
1247 } else if (RetOpcode == X86::TCRETURNri64) {
1248 BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr64), JumpTarget.getReg());
1250 BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr), JumpTarget.getReg());
1253 MachineInstr *NewMI = prior(MBBI);
1254 for (unsigned i = 2, e = MBBI->getNumOperands(); i != e; ++i)
1255 NewMI->addOperand(MBBI->getOperand(i));
1257 // Delete the pseudo instruction TCRETURN.
1259 } else if ((RetOpcode == X86::RET || RetOpcode == X86::RETI) &&
1260 (X86FI->getTCReturnAddrDelta() < 0)) {
1261 // Add the return addr area delta back since we are not tail calling.
1262 int delta = -1*X86FI->getTCReturnAddrDelta();
1263 MBBI = prior(MBB.end());
1265 // Check for possible merge with preceeding ADD instruction.
1266 delta += mergeSPUpdates(MBB, MBBI, StackPtr, true);
1267 emitSPUpdate(MBB, MBBI, StackPtr, delta, Is64Bit, TII);
1271 unsigned X86RegisterInfo::getRARegister() const {
1272 return Is64Bit ? X86::RIP // Should have dwarf #16.
1273 : X86::EIP; // Should have dwarf #8.
1276 unsigned X86RegisterInfo::getFrameRegister(const MachineFunction &MF) const {
1277 return hasFP(MF) ? FramePtr : StackPtr;
1281 X86RegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const {
1282 // Calculate amount of bytes used for return address storing
1283 int stackGrowth = (Is64Bit ? -8 : -4);
1285 // Initial state of the frame pointer is esp+4.
1286 MachineLocation Dst(MachineLocation::VirtualFP);
1287 MachineLocation Src(StackPtr, stackGrowth);
1288 Moves.push_back(MachineMove(0, Dst, Src));
1290 // Add return address to move list
1291 MachineLocation CSDst(StackPtr, stackGrowth);
1292 MachineLocation CSSrc(getRARegister());
1293 Moves.push_back(MachineMove(0, CSDst, CSSrc));
1296 unsigned X86RegisterInfo::getEHExceptionRegister() const {
1297 llvm_unreachable("What is the exception register");
1301 unsigned X86RegisterInfo::getEHHandlerRegister() const {
1302 llvm_unreachable("What is the exception handler register");
1307 unsigned getX86SubSuperRegister(unsigned Reg, EVT VT, bool High) {
1308 switch (VT.getSimpleVT().SimpleTy) {
1309 default: return Reg;
1314 case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
1316 case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX:
1318 case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX:
1320 case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX:
1326 case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
1328 case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX:
1330 case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX:
1332 case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX:
1334 case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI:
1336 case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI:
1338 case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP:
1340 case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP:
1342 case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8:
1344 case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9:
1346 case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10:
1348 case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11:
1350 case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12:
1352 case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13:
1354 case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14:
1356 case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15:
1362 default: return Reg;
1363 case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
1365 case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX:
1367 case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX:
1369 case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX:
1371 case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI:
1373 case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI:
1375 case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP:
1377 case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP:
1379 case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8:
1381 case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9:
1383 case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10:
1385 case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11:
1387 case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12:
1389 case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13:
1391 case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14:
1393 case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15:
1398 default: return Reg;
1399 case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
1401 case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX:
1403 case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX:
1405 case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX:
1407 case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI:
1409 case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI:
1411 case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP:
1413 case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP:
1415 case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8:
1417 case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9:
1419 case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10:
1421 case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11:
1423 case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12:
1425 case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13:
1427 case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14:
1429 case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15:
1434 default: return Reg;
1435 case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
1437 case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX:
1439 case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX:
1441 case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX:
1443 case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI:
1445 case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI:
1447 case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP:
1449 case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP:
1451 case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8:
1453 case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9:
1455 case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10:
1457 case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11:
1459 case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12:
1461 case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13:
1463 case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14:
1465 case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15:
1474 #include "X86GenRegisterInfo.inc"