1 //===- ARMBaseRegisterInfo.cpp - ARM 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 base ARM implementation of TargetRegisterInfo class.
12 //===----------------------------------------------------------------------===//
15 #include "ARMAddressingModes.h"
16 #include "ARMBaseInstrInfo.h"
17 #include "ARMBaseRegisterInfo.h"
18 #include "ARMInstrInfo.h"
19 #include "ARMMachineFunctionInfo.h"
20 #include "ARMSubtarget.h"
21 #include "llvm/Constants.h"
22 #include "llvm/DerivedTypes.h"
23 #include "llvm/Function.h"
24 #include "llvm/LLVMContext.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFrameInfo.h"
27 #include "llvm/CodeGen/MachineFunction.h"
28 #include "llvm/CodeGen/MachineInstrBuilder.h"
29 #include "llvm/CodeGen/MachineLocation.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/CodeGen/RegisterScavenging.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/raw_ostream.h"
34 #include "llvm/Target/TargetFrameInfo.h"
35 #include "llvm/Target/TargetMachine.h"
36 #include "llvm/Target/TargetOptions.h"
37 #include "llvm/ADT/BitVector.h"
38 #include "llvm/ADT/SmallVector.h"
41 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum,
49 llvm_unreachable("Unknown ARM register!");
50 case R0: case D0: case Q0: return 0;
51 case R1: case D1: case Q1: return 1;
52 case R2: case D2: case Q2: return 2;
53 case R3: case D3: case Q3: return 3;
54 case R4: case D4: case Q4: return 4;
55 case R5: case D5: case Q5: return 5;
56 case R6: case D6: case Q6: return 6;
57 case R7: case D7: case Q7: return 7;
58 case R8: case D8: case Q8: return 8;
59 case R9: case D9: case Q9: return 9;
60 case R10: case D10: case Q10: return 10;
61 case R11: case D11: case Q11: return 11;
62 case R12: case D12: case Q12: return 12;
63 case SP: case D13: case Q13: return 13;
64 case LR: case D14: case Q14: return 14;
65 case PC: case D15: case Q15: return 15;
84 case S0: case S1: case S2: case S3:
85 case S4: case S5: case S6: case S7:
86 case S8: case S9: case S10: case S11:
87 case S12: case S13: case S14: case S15:
88 case S16: case S17: case S18: case S19:
89 case S20: case S21: case S22: case S23:
90 case S24: case S25: case S26: case S27:
91 case S28: case S29: case S30: case S31: {
95 default: return 0; // Avoid compile time warning.
133 ARMBaseRegisterInfo::ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
134 const ARMSubtarget &sti)
135 : ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
137 FramePtr((STI.isTargetDarwin() || STI.isThumb()) ? ARM::R7 : ARM::R11) {
140 unsigned ARMBaseRegisterInfo::
141 getOpcode(int Op) const {
142 return TII.getOpcode((ARMII::Op)Op);
145 unsigned ARMBaseRegisterInfo::
146 unsignedOffsetOpcodeToSigned(unsigned opcode, unsigned *NumBits) const {
147 return TII.unsignedOffsetOpcodeToSigned(opcode, NumBits);
151 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
152 static const unsigned CalleeSavedRegs[] = {
153 ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
154 ARM::R7, ARM::R6, ARM::R5, ARM::R4,
156 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
157 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
161 static const unsigned DarwinCalleeSavedRegs[] = {
162 // Darwin ABI deviates from ARM standard ABI. R9 is not a callee-saved
164 ARM::LR, ARM::R7, ARM::R6, ARM::R5, ARM::R4,
165 ARM::R11, ARM::R10, ARM::R8,
167 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
168 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
171 return STI.isTargetDarwin() ? DarwinCalleeSavedRegs : CalleeSavedRegs;
174 const TargetRegisterClass* const *
175 ARMBaseRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
176 static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
177 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
178 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
179 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
181 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
182 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
186 static const TargetRegisterClass * const ThumbCalleeSavedRegClasses[] = {
187 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
188 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::tGPRRegClass,
189 &ARM::tGPRRegClass,&ARM::tGPRRegClass,&ARM::tGPRRegClass,
191 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
192 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
196 static const TargetRegisterClass * const DarwinCalleeSavedRegClasses[] = {
197 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
198 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
199 &ARM::GPRRegClass, &ARM::GPRRegClass,
201 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
202 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
206 static const TargetRegisterClass * const DarwinThumbCalleeSavedRegClasses[] ={
207 &ARM::GPRRegClass, &ARM::tGPRRegClass, &ARM::tGPRRegClass,
208 &ARM::tGPRRegClass, &ARM::tGPRRegClass, &ARM::GPRRegClass,
209 &ARM::GPRRegClass, &ARM::GPRRegClass,
211 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
212 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
216 if (STI.isThumb1Only()) {
217 return STI.isTargetDarwin()
218 ? DarwinThumbCalleeSavedRegClasses : ThumbCalleeSavedRegClasses;
220 return STI.isTargetDarwin()
221 ? DarwinCalleeSavedRegClasses : CalleeSavedRegClasses;
224 BitVector ARMBaseRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
225 // FIXME: avoid re-calculating this everytime.
226 BitVector Reserved(getNumRegs());
227 Reserved.set(ARM::SP);
228 Reserved.set(ARM::PC);
229 if (STI.isTargetDarwin() || hasFP(MF))
230 Reserved.set(FramePtr);
231 // Some targets reserve R9.
232 if (STI.isR9Reserved())
233 Reserved.set(ARM::R9);
238 ARMBaseRegisterInfo::isReservedReg(const MachineFunction &MF, unsigned Reg) const {
246 if (FramePtr == Reg && (STI.isTargetDarwin() || hasFP(MF)))
250 return STI.isR9Reserved();
256 const TargetRegisterClass *ARMBaseRegisterInfo::getPointerRegClass() const {
257 return &ARM::GPRRegClass;
260 /// getAllocationOrder - Returns the register allocation order for a specified
261 /// register class in the form of a pair of TargetRegisterClass iterators.
262 std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator>
263 ARMBaseRegisterInfo::getAllocationOrder(const TargetRegisterClass *RC,
264 unsigned HintType, unsigned HintReg,
265 const MachineFunction &MF) const {
266 // Alternative register allocation orders when favoring even / odd registers
267 // of register pairs.
269 // No FP, R9 is available.
270 static const unsigned GPREven1[] = {
271 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8, ARM::R10,
272 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7,
275 static const unsigned GPROdd1[] = {
276 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R9, ARM::R11,
277 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
281 // FP is R7, R9 is available.
282 static const unsigned GPREven2[] = {
283 ARM::R0, ARM::R2, ARM::R4, ARM::R8, ARM::R10,
284 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6,
287 static const unsigned GPROdd2[] = {
288 ARM::R1, ARM::R3, ARM::R5, ARM::R9, ARM::R11,
289 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
293 // FP is R11, R9 is available.
294 static const unsigned GPREven3[] = {
295 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8,
296 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7,
299 static const unsigned GPROdd3[] = {
300 ARM::R1, ARM::R3, ARM::R5, ARM::R6, ARM::R9,
301 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R7,
305 // No FP, R9 is not available.
306 static const unsigned GPREven4[] = {
307 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R10,
308 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8,
311 static const unsigned GPROdd4[] = {
312 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R11,
313 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
317 // FP is R7, R9 is not available.
318 static const unsigned GPREven5[] = {
319 ARM::R0, ARM::R2, ARM::R4, ARM::R10,
320 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6, ARM::R8,
323 static const unsigned GPROdd5[] = {
324 ARM::R1, ARM::R3, ARM::R5, ARM::R11,
325 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
329 // FP is R11, R9 is not available.
330 static const unsigned GPREven6[] = {
331 ARM::R0, ARM::R2, ARM::R4, ARM::R6,
332 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8
334 static const unsigned GPROdd6[] = {
335 ARM::R1, ARM::R3, ARM::R5, ARM::R7,
336 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8
340 if (HintType == ARMRI::RegPairEven) {
341 if (isPhysicalRegister(HintReg) && getRegisterPairEven(HintReg, MF) == 0)
342 // It's no longer possible to fulfill this hint. Return the default
344 return std::make_pair(RC->allocation_order_begin(MF),
345 RC->allocation_order_end(MF));
347 if (!STI.isTargetDarwin() && !hasFP(MF)) {
348 if (!STI.isR9Reserved())
349 return std::make_pair(GPREven1,
350 GPREven1 + (sizeof(GPREven1)/sizeof(unsigned)));
352 return std::make_pair(GPREven4,
353 GPREven4 + (sizeof(GPREven4)/sizeof(unsigned)));
354 } else if (FramePtr == ARM::R7) {
355 if (!STI.isR9Reserved())
356 return std::make_pair(GPREven2,
357 GPREven2 + (sizeof(GPREven2)/sizeof(unsigned)));
359 return std::make_pair(GPREven5,
360 GPREven5 + (sizeof(GPREven5)/sizeof(unsigned)));
361 } else { // FramePtr == ARM::R11
362 if (!STI.isR9Reserved())
363 return std::make_pair(GPREven3,
364 GPREven3 + (sizeof(GPREven3)/sizeof(unsigned)));
366 return std::make_pair(GPREven6,
367 GPREven6 + (sizeof(GPREven6)/sizeof(unsigned)));
369 } else if (HintType == ARMRI::RegPairOdd) {
370 if (isPhysicalRegister(HintReg) && getRegisterPairOdd(HintReg, MF) == 0)
371 // It's no longer possible to fulfill this hint. Return the default
373 return std::make_pair(RC->allocation_order_begin(MF),
374 RC->allocation_order_end(MF));
376 if (!STI.isTargetDarwin() && !hasFP(MF)) {
377 if (!STI.isR9Reserved())
378 return std::make_pair(GPROdd1,
379 GPROdd1 + (sizeof(GPROdd1)/sizeof(unsigned)));
381 return std::make_pair(GPROdd4,
382 GPROdd4 + (sizeof(GPROdd4)/sizeof(unsigned)));
383 } else if (FramePtr == ARM::R7) {
384 if (!STI.isR9Reserved())
385 return std::make_pair(GPROdd2,
386 GPROdd2 + (sizeof(GPROdd2)/sizeof(unsigned)));
388 return std::make_pair(GPROdd5,
389 GPROdd5 + (sizeof(GPROdd5)/sizeof(unsigned)));
390 } else { // FramePtr == ARM::R11
391 if (!STI.isR9Reserved())
392 return std::make_pair(GPROdd3,
393 GPROdd3 + (sizeof(GPROdd3)/sizeof(unsigned)));
395 return std::make_pair(GPROdd6,
396 GPROdd6 + (sizeof(GPROdd6)/sizeof(unsigned)));
399 return std::make_pair(RC->allocation_order_begin(MF),
400 RC->allocation_order_end(MF));
403 /// ResolveRegAllocHint - Resolves the specified register allocation hint
404 /// to a physical register. Returns the physical register if it is successful.
406 ARMBaseRegisterInfo::ResolveRegAllocHint(unsigned Type, unsigned Reg,
407 const MachineFunction &MF) const {
408 if (Reg == 0 || !isPhysicalRegister(Reg))
412 else if (Type == (unsigned)ARMRI::RegPairOdd)
414 return getRegisterPairOdd(Reg, MF);
415 else if (Type == (unsigned)ARMRI::RegPairEven)
417 return getRegisterPairEven(Reg, MF);
422 ARMBaseRegisterInfo::UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
423 MachineFunction &MF) const {
424 MachineRegisterInfo *MRI = &MF.getRegInfo();
425 std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(Reg);
426 if ((Hint.first == (unsigned)ARMRI::RegPairOdd ||
427 Hint.first == (unsigned)ARMRI::RegPairEven) &&
428 Hint.second && TargetRegisterInfo::isVirtualRegister(Hint.second)) {
429 // If 'Reg' is one of the even / odd register pair and it's now changed
430 // (e.g. coalesced) into a different register. The other register of the
431 // pair allocation hint must be updated to reflect the relationship
433 unsigned OtherReg = Hint.second;
434 Hint = MRI->getRegAllocationHint(OtherReg);
435 if (Hint.second == Reg)
436 // Make sure the pair has not already divorced.
437 MRI->setRegAllocationHint(OtherReg, Hint.first, NewReg);
441 /// hasFP - Return true if the specified function should have a dedicated frame
442 /// pointer register. This is true if the function has variable sized allocas
443 /// or if frame pointer elimination is disabled.
445 bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
446 const MachineFrameInfo *MFI = MF.getFrameInfo();
447 return (NoFramePointerElim ||
448 MFI->hasVarSizedObjects() ||
449 MFI->isFrameAddressTaken());
452 static unsigned estimateStackSize(MachineFunction &MF, MachineFrameInfo *MFI) {
453 const MachineFrameInfo *FFI = MF.getFrameInfo();
455 for (int i = FFI->getObjectIndexBegin(); i != 0; ++i) {
456 int FixedOff = -FFI->getObjectOffset(i);
457 if (FixedOff > Offset) Offset = FixedOff;
459 for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
460 if (FFI->isDeadObjectIndex(i))
462 Offset += FFI->getObjectSize(i);
463 unsigned Align = FFI->getObjectAlignment(i);
464 // Adjust to alignment boundary
465 Offset = (Offset+Align-1)/Align*Align;
467 return (unsigned)Offset;
471 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
472 RegScavenger *RS) const {
473 // This tells PEI to spill the FP as if it is any other callee-save register
474 // to take advantage the eliminateFrameIndex machinery. This also ensures it
475 // is spilled in the order specified by getCalleeSavedRegs() to make it easier
476 // to combine multiple loads / stores.
477 bool CanEliminateFrame = true;
478 bool CS1Spilled = false;
479 bool LRSpilled = false;
480 unsigned NumGPRSpills = 0;
481 SmallVector<unsigned, 4> UnspilledCS1GPRs;
482 SmallVector<unsigned, 4> UnspilledCS2GPRs;
483 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
485 // Don't spill FP if the frame can be eliminated. This is determined
486 // by scanning the callee-save registers to see if any is used.
487 const unsigned *CSRegs = getCalleeSavedRegs();
488 const TargetRegisterClass* const *CSRegClasses = getCalleeSavedRegClasses();
489 for (unsigned i = 0; CSRegs[i]; ++i) {
490 unsigned Reg = CSRegs[i];
491 bool Spilled = false;
492 if (MF.getRegInfo().isPhysRegUsed(Reg)) {
493 AFI->setCSRegisterIsSpilled(Reg);
495 CanEliminateFrame = false;
497 // Check alias registers too.
498 for (const unsigned *Aliases = getAliasSet(Reg); *Aliases; ++Aliases) {
499 if (MF.getRegInfo().isPhysRegUsed(*Aliases)) {
501 CanEliminateFrame = false;
506 if (CSRegClasses[i] == &ARM::GPRRegClass) {
510 if (!STI.isTargetDarwin()) {
517 // Keep track if LR and any of R4, R5, R6, and R7 is spilled.
532 if (!STI.isTargetDarwin()) {
533 UnspilledCS1GPRs.push_back(Reg);
543 UnspilledCS1GPRs.push_back(Reg);
546 UnspilledCS2GPRs.push_back(Reg);
553 bool ForceLRSpill = false;
554 if (!LRSpilled && AFI->isThumb1OnlyFunction()) {
555 unsigned FnSize = TII.GetFunctionSizeInBytes(MF);
556 // Force LR to be spilled if the Thumb function size is > 2048. This enables
557 // use of BL to implement far jump. If it turns out that it's not needed
558 // then the branch fix up path will undo it.
559 if (FnSize >= (1 << 11)) {
560 CanEliminateFrame = false;
565 bool ExtraCSSpill = false;
566 if (!CanEliminateFrame || hasFP(MF)) {
567 AFI->setHasStackFrame(true);
569 // If LR is not spilled, but at least one of R4, R5, R6, and R7 is spilled.
570 // Spill LR as well so we can fold BX_RET to the registers restore (LDM).
571 if (!LRSpilled && CS1Spilled) {
572 MF.getRegInfo().setPhysRegUsed(ARM::LR);
573 AFI->setCSRegisterIsSpilled(ARM::LR);
575 UnspilledCS1GPRs.erase(std::find(UnspilledCS1GPRs.begin(),
576 UnspilledCS1GPRs.end(), (unsigned)ARM::LR));
577 ForceLRSpill = false;
581 // Darwin ABI requires FP to point to the stack slot that contains the
583 if (STI.isTargetDarwin() || hasFP(MF)) {
584 MF.getRegInfo().setPhysRegUsed(FramePtr);
588 // If stack and double are 8-byte aligned and we are spilling an odd number
589 // of GPRs. Spill one extra callee save GPR so we won't have to pad between
590 // the integer and double callee save areas.
591 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
592 if (TargetAlign == 8 && (NumGPRSpills & 1)) {
593 if (CS1Spilled && !UnspilledCS1GPRs.empty()) {
594 for (unsigned i = 0, e = UnspilledCS1GPRs.size(); i != e; ++i) {
595 unsigned Reg = UnspilledCS1GPRs[i];
596 // Don't spill high register if the function is thumb1
597 if (!AFI->isThumb1OnlyFunction() ||
598 isARMLowRegister(Reg) || Reg == ARM::LR) {
599 MF.getRegInfo().setPhysRegUsed(Reg);
600 AFI->setCSRegisterIsSpilled(Reg);
601 if (!isReservedReg(MF, Reg))
606 } else if (!UnspilledCS2GPRs.empty() &&
607 !AFI->isThumb1OnlyFunction()) {
608 unsigned Reg = UnspilledCS2GPRs.front();
609 MF.getRegInfo().setPhysRegUsed(Reg);
610 AFI->setCSRegisterIsSpilled(Reg);
611 if (!isReservedReg(MF, Reg))
616 // Estimate if we might need to scavenge a register at some point in order
617 // to materialize a stack offset. If so, either spill one additional
618 // callee-saved register or reserve a special spill slot to facilitate
619 // register scavenging.
620 if (RS && !ExtraCSSpill && !AFI->isThumb1OnlyFunction()) {
621 MachineFrameInfo *MFI = MF.getFrameInfo();
622 unsigned Size = estimateStackSize(MF, MFI);
623 unsigned Limit = (1 << 12) - 1;
624 for (MachineFunction::iterator BB = MF.begin(),E = MF.end();BB != E; ++BB)
625 for (MachineBasicBlock::iterator I= BB->begin(); I != BB->end(); ++I) {
626 for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
627 if (I->getOperand(i).isFI()) {
628 unsigned Opcode = I->getOpcode();
629 const TargetInstrDesc &Desc = TII.get(Opcode);
630 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
631 if (AddrMode == ARMII::AddrMode3) {
632 Limit = (1 << 8) - 1;
634 } else if (AddrMode == ARMII::AddrMode5) {
635 unsigned ThisLimit = ((1 << 8) - 1) * 4;
636 if (ThisLimit < Limit)
643 // If any non-reserved CS register isn't spilled, just spill one or two
644 // extra. That should take care of it!
645 unsigned NumExtras = TargetAlign / 4;
646 SmallVector<unsigned, 2> Extras;
647 while (NumExtras && !UnspilledCS1GPRs.empty()) {
648 unsigned Reg = UnspilledCS1GPRs.back();
649 UnspilledCS1GPRs.pop_back();
650 if (!isReservedReg(MF, Reg)) {
651 Extras.push_back(Reg);
655 while (NumExtras && !UnspilledCS2GPRs.empty()) {
656 unsigned Reg = UnspilledCS2GPRs.back();
657 UnspilledCS2GPRs.pop_back();
658 if (!isReservedReg(MF, Reg)) {
659 Extras.push_back(Reg);
663 if (Extras.size() && NumExtras == 0) {
664 for (unsigned i = 0, e = Extras.size(); i != e; ++i) {
665 MF.getRegInfo().setPhysRegUsed(Extras[i]);
666 AFI->setCSRegisterIsSpilled(Extras[i]);
669 // Reserve a slot closest to SP or frame pointer.
670 const TargetRegisterClass *RC = &ARM::GPRRegClass;
671 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
672 RC->getAlignment()));
679 MF.getRegInfo().setPhysRegUsed(ARM::LR);
680 AFI->setCSRegisterIsSpilled(ARM::LR);
681 AFI->setLRIsSpilledForFarJump(true);
685 unsigned ARMBaseRegisterInfo::getRARegister() const {
689 unsigned ARMBaseRegisterInfo::getFrameRegister(MachineFunction &MF) const {
690 if (STI.isTargetDarwin() || hasFP(MF))
695 unsigned ARMBaseRegisterInfo::getEHExceptionRegister() const {
696 llvm_unreachable("What is the exception register");
700 unsigned ARMBaseRegisterInfo::getEHHandlerRegister() const {
701 llvm_unreachable("What is the exception handler register");
705 int ARMBaseRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
706 return ARMGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
709 unsigned ARMBaseRegisterInfo::getRegisterPairEven(unsigned Reg,
710 const MachineFunction &MF) const {
713 // Return 0 if either register of the pair is a special register.
719 return STI.isThumb1Only() ? 0 : ARM::R2;
723 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R6;
725 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R8;
727 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R10;
799 unsigned ARMBaseRegisterInfo::getRegisterPairOdd(unsigned Reg,
800 const MachineFunction &MF) const {
803 // Return 0 if either register of the pair is a special register.
809 return STI.isThumb1Only() ? 0 : ARM::R3;
813 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R7;
815 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R9;
817 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R11;
889 // FIXME: Dup in ARMBaseInstrInfo.cpp
891 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
892 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
896 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
897 return MIB.addReg(0);
900 /// emitLoadConstPool - Emits a load from constpool to materialize the
901 /// specified immediate.
902 void ARMBaseRegisterInfo::
903 emitLoadConstPool(MachineBasicBlock &MBB,
904 MachineBasicBlock::iterator &MBBI,
906 unsigned DestReg, unsigned SubIdx, int Val,
907 ARMCC::CondCodes Pred,
908 unsigned PredReg) const {
909 MachineFunction &MF = *MBB.getParent();
910 MachineConstantPool *ConstantPool = MF.getConstantPool();
912 MF.getFunction()->getContext().getConstantInt(Type::Int32Ty, Val);
913 unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
915 BuildMI(MBB, MBBI, dl, TII.get(ARM::LDRcp))
916 .addReg(DestReg, getDefRegState(true), SubIdx)
917 .addConstantPoolIndex(Idx)
918 .addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
921 bool ARMBaseRegisterInfo::
922 requiresRegisterScavenging(const MachineFunction &MF) const {
926 // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
927 // not required, we reserve argument space for call sites in the function
928 // immediately on entry to the current function. This eliminates the need for
929 // add/sub sp brackets around call sites. Returns true if the call frame is
930 // included as part of the stack frame.
931 bool ARMBaseRegisterInfo::
932 hasReservedCallFrame(MachineFunction &MF) const {
933 const MachineFrameInfo *FFI = MF.getFrameInfo();
934 unsigned CFSize = FFI->getMaxCallFrameSize();
935 // It's not always a good idea to include the call frame as part of the
936 // stack frame. ARM (especially Thumb) has small immediate offset to
937 // address the stack frame. So a large call frame can cause poor codegen
938 // and may even makes it impossible to scavenge a register.
939 if (CFSize >= ((1 << 12) - 1) / 2) // Half of imm12
942 return !MF.getFrameInfo()->hasVarSizedObjects();
945 /// emitARMRegPlusImmediate - Emits a series of instructions to materialize
946 /// a destreg = basereg + immediate in ARM code.
948 void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
949 MachineBasicBlock::iterator &MBBI,
950 unsigned DestReg, unsigned BaseReg, int NumBytes,
951 ARMCC::CondCodes Pred, unsigned PredReg,
952 const ARMBaseInstrInfo &TII,
954 bool isSub = NumBytes < 0;
955 if (isSub) NumBytes = -NumBytes;
958 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
959 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
960 assert(ThisVal && "Didn't extract field correctly");
962 // We will handle these bits from offset, clear them.
963 NumBytes &= ~ThisVal;
965 assert(ARM_AM::getSOImmVal(ThisVal) != -1 && "Bit extraction didn't work?");
967 // Build the new ADD / SUB.
968 BuildMI(MBB, MBBI, dl, TII.get(TII.getOpcode(isSub ? ARMII::SUBri : ARMII::ADDri)), DestReg)
969 .addReg(BaseReg, RegState::Kill).addImm(ThisVal)
970 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
976 emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
977 const ARMBaseInstrInfo &TII, DebugLoc dl,
979 ARMCC::CondCodes Pred = ARMCC::AL, unsigned PredReg = 0) {
980 emitARMRegPlusImmediate(MBB, MBBI, ARM::SP, ARM::SP, NumBytes,
981 Pred, PredReg, TII, dl);
984 void ARMBaseRegisterInfo::
985 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
986 MachineBasicBlock::iterator I) const {
987 if (!hasReservedCallFrame(MF)) {
988 // If we have alloca, convert as follows:
989 // ADJCALLSTACKDOWN -> sub, sp, sp, amount
990 // ADJCALLSTACKUP -> add, sp, sp, amount
991 MachineInstr *Old = I;
992 DebugLoc dl = Old->getDebugLoc();
993 unsigned Amount = Old->getOperand(0).getImm();
995 // We need to keep the stack aligned properly. To do this, we round the
996 // amount of space needed for the outgoing arguments up to the next
997 // alignment boundary.
998 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
999 Amount = (Amount+Align-1)/Align*Align;
1001 // Replace the pseudo instruction with a new instruction...
1002 unsigned Opc = Old->getOpcode();
1003 ARMCC::CondCodes Pred = (ARMCC::CondCodes)Old->getOperand(1).getImm();
1004 if (Opc == ARM::ADJCALLSTACKDOWN || Opc == ARM::tADJCALLSTACKDOWN) {
1005 // Note: PredReg is operand 2 for ADJCALLSTACKDOWN.
1006 unsigned PredReg = Old->getOperand(2).getReg();
1007 emitSPUpdate(MBB, I, TII, dl, -Amount, Pred, PredReg);
1009 // Note: PredReg is operand 3 for ADJCALLSTACKUP.
1010 unsigned PredReg = Old->getOperand(3).getReg();
1011 assert(Opc == ARM::ADJCALLSTACKUP || Opc == ARM::tADJCALLSTACKUP);
1012 emitSPUpdate(MBB, I, TII, dl, Amount, Pred, PredReg);
1019 /// findScratchRegister - Find a 'free' ARM register. If register scavenger
1020 /// is not being used, R12 is available. Otherwise, try for a call-clobbered
1021 /// register first and then a spilled callee-saved register if that fails.
1023 unsigned findScratchRegister(RegScavenger *RS, const TargetRegisterClass *RC,
1024 ARMFunctionInfo *AFI) {
1025 unsigned Reg = RS ? RS->FindUnusedReg(RC, true) : (unsigned) ARM::R12;
1026 assert (!AFI->isThumb1OnlyFunction());
1028 // Try a already spilled CS register.
1029 Reg = RS->FindUnusedReg(RC, AFI->getSpilledCSRegisters());
1034 void ARMBaseRegisterInfo::
1035 eliminateFrameIndex(MachineBasicBlock::iterator II,
1036 int SPAdj, RegScavenger *RS) const{
1038 MachineInstr &MI = *II;
1039 MachineBasicBlock &MBB = *MI.getParent();
1040 MachineFunction &MF = *MBB.getParent();
1041 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1042 DebugLoc dl = MI.getDebugLoc();
1044 while (!MI.getOperand(i).isFI()) {
1046 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
1049 unsigned FrameReg = ARM::SP;
1050 int FrameIndex = MI.getOperand(i).getIndex();
1051 int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
1052 MF.getFrameInfo()->getStackSize() + SPAdj;
1054 if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
1055 Offset -= AFI->getGPRCalleeSavedArea1Offset();
1056 else if (AFI->isGPRCalleeSavedArea2Frame(FrameIndex))
1057 Offset -= AFI->getGPRCalleeSavedArea2Offset();
1058 else if (AFI->isDPRCalleeSavedAreaFrame(FrameIndex))
1059 Offset -= AFI->getDPRCalleeSavedAreaOffset();
1060 else if (hasFP(MF)) {
1061 assert(SPAdj == 0 && "Unexpected");
1062 // There is alloca()'s in this function, must reference off the frame
1064 FrameReg = getFrameRegister(MF);
1065 Offset -= AFI->getFramePtrSpillOffset();
1068 unsigned Opcode = MI.getOpcode();
1069 const TargetInstrDesc &Desc = MI.getDesc();
1070 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
1073 // Memory operands in inline assembly always use AddrMode2.
1074 if (Opcode == ARM::INLINEASM)
1075 AddrMode = ARMII::AddrMode2;
1077 if (Opcode == getOpcode(ARMII::ADDri)) {
1078 Offset += MI.getOperand(i+1).getImm();
1080 // Turn it into a move.
1081 MI.setDesc(TII.get(getOpcode(ARMII::MOVr)));
1082 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1083 MI.RemoveOperand(i+1);
1085 } else if (Offset < 0) {
1088 MI.setDesc(TII.get(getOpcode(ARMII::SUBri)));
1091 // Common case: small offset, fits into instruction.
1092 if (ARM_AM::getSOImmVal(Offset) != -1) {
1093 // Replace the FrameIndex with sp / fp
1094 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1095 MI.getOperand(i+1).ChangeToImmediate(Offset);
1099 // Otherwise, we fallback to common code below to form the imm offset with
1100 // a sequence of ADDri instructions. First though, pull as much of the imm
1101 // into this ADDri as possible.
1102 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
1103 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
1105 // We will handle these bits from offset, clear them.
1106 Offset &= ~ThisImmVal;
1108 // Get the properly encoded SOImmVal field.
1109 assert(ARM_AM::getSOImmVal(ThisImmVal) != -1 &&
1110 "Bit extraction didn't work?");
1111 MI.getOperand(i+1).ChangeToImmediate(ThisImmVal);
1113 unsigned ImmIdx = 0;
1115 unsigned NumBits = 0;
1117 bool encodedOffset = true;
1118 bool HandlesNeg = true;
1120 case ARMII::AddrMode2: {
1122 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
1123 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1128 case ARMII::AddrMode3: {
1130 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
1131 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1136 case ARMII::AddrMode5: {
1138 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
1139 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1145 case ARMII::AddrModeT2_i12: {
1147 InstrOffs = MI.getOperand(ImmIdx).getImm();
1149 encodedOffset = false;
1153 case ARMII::AddrModeT2_i8: {
1155 InstrOffs = MI.getOperand(ImmIdx).getImm();
1157 encodedOffset = false;
1160 case ARMII::AddrModeT2_so: {
1162 InstrOffs = MI.getOperand(ImmIdx).getImm();
1163 encodedOffset = false;
1167 llvm_unreachable("Unsupported addressing mode!");
1171 Offset += InstrOffs * Scale;
1172 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
1174 // For addrmodes that cannot handle negative offsets, convert to
1175 // an opcode that can, or set NumBits == 0 to avoid folding
1176 // address computation
1178 unsigned usop = unsignedOffsetOpcodeToSigned(Opcode, &NumBits);
1180 MI.setDesc(TII.get(usop));
1193 // Attempt to fold address comp. if opcode has offset bits
1195 // Common case: small offset, fits into instruction.
1196 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
1197 int ImmedOffset = Offset / Scale;
1198 unsigned Mask = (1 << NumBits) - 1;
1199 if ((unsigned)Offset <= Mask * Scale) {
1200 // Replace the FrameIndex with sp
1201 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1204 ImmedOffset |= 1 << NumBits;
1206 ImmedOffset = -ImmedOffset;
1208 ImmOp.ChangeToImmediate(ImmedOffset);
1212 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
1213 ImmedOffset = ImmedOffset & Mask;
1216 ImmedOffset |= 1 << NumBits;
1218 ImmedOffset = -ImmedOffset;
1220 ImmOp.ChangeToImmediate(ImmedOffset);
1221 Offset &= ~(Mask*Scale);
1225 // If we get here, the immediate doesn't fit into the instruction. We folded
1226 // as much as possible above, handle the rest, providing a register that is
1228 assert(Offset && "This code isn't needed if offset already handled!");
1230 // Insert a set of r12 with the full address: r12 = sp + offset
1231 // If the offset we have is too large to fit into the instruction, we need
1232 // to form it with a series of ADDri's. Do this by taking 8-bit chunks
1234 unsigned ScratchReg = findScratchRegister(RS, &ARM::GPRRegClass, AFI);
1235 if (ScratchReg == 0)
1236 // No register is "free". Scavenge a register.
1237 ScratchReg = RS->scavengeRegister(&ARM::GPRRegClass, II, SPAdj);
1238 int PIdx = MI.findFirstPredOperandIdx();
1239 ARMCC::CondCodes Pred = (PIdx == -1)
1240 ? ARMCC::AL : (ARMCC::CondCodes)MI.getOperand(PIdx).getImm();
1241 unsigned PredReg = (PIdx == -1) ? 0 : MI.getOperand(PIdx+1).getReg();
1242 emitARMRegPlusImmediate(MBB, II, ScratchReg, FrameReg,
1243 isSub ? -Offset : Offset, Pred, PredReg, TII, dl);
1244 MI.getOperand(i).ChangeToRegister(ScratchReg, false, false, true);
1247 /// Move iterator pass the next bunch of callee save load / store ops for
1248 /// the particular spill area (1: integer area 1, 2: integer area 2,
1249 /// 3: fp area, 0: don't care).
1250 static void movePastCSLoadStoreOps(MachineBasicBlock &MBB,
1251 MachineBasicBlock::iterator &MBBI,
1252 int Opc, unsigned Area,
1253 const ARMSubtarget &STI) {
1254 while (MBBI != MBB.end() &&
1255 MBBI->getOpcode() == Opc && MBBI->getOperand(1).isFI()) {
1258 unsigned Category = 0;
1259 switch (MBBI->getOperand(0).getReg()) {
1260 case ARM::R4: case ARM::R5: case ARM::R6: case ARM::R7:
1264 case ARM::R8: case ARM::R9: case ARM::R10: case ARM::R11:
1265 Category = STI.isTargetDarwin() ? 2 : 1;
1267 case ARM::D8: case ARM::D9: case ARM::D10: case ARM::D11:
1268 case ARM::D12: case ARM::D13: case ARM::D14: case ARM::D15:
1275 if (Done || Category != Area)
1283 void ARMBaseRegisterInfo::
1284 emitPrologue(MachineFunction &MF) const {
1285 MachineBasicBlock &MBB = MF.front();
1286 MachineBasicBlock::iterator MBBI = MBB.begin();
1287 MachineFrameInfo *MFI = MF.getFrameInfo();
1288 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1289 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1290 unsigned NumBytes = MFI->getStackSize();
1291 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1292 DebugLoc dl = (MBBI != MBB.end() ?
1293 MBBI->getDebugLoc() : DebugLoc::getUnknownLoc());
1295 // Determine the sizes of each callee-save spill areas and record which frame
1296 // belongs to which callee-save spill areas.
1297 unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
1298 int FramePtrSpillFI = 0;
1301 emitSPUpdate(MBB, MBBI, TII, dl, -VARegSaveSize);
1303 if (!AFI->hasStackFrame()) {
1305 emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
1309 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1310 unsigned Reg = CSI[i].getReg();
1311 int FI = CSI[i].getFrameIdx();
1318 if (Reg == FramePtr)
1319 FramePtrSpillFI = FI;
1320 AFI->addGPRCalleeSavedArea1Frame(FI);
1327 if (Reg == FramePtr)
1328 FramePtrSpillFI = FI;
1329 if (STI.isTargetDarwin()) {
1330 AFI->addGPRCalleeSavedArea2Frame(FI);
1333 AFI->addGPRCalleeSavedArea1Frame(FI);
1338 AFI->addDPRCalleeSavedAreaFrame(FI);
1343 // Build the new SUBri to adjust SP for integer callee-save spill area 1.
1344 emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS1Size);
1345 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::STR), 1, STI);
1347 // Darwin ABI requires FP to point to the stack slot that contains the
1349 if (STI.isTargetDarwin() || hasFP(MF)) {
1350 MachineInstrBuilder MIB =
1351 BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::ADDri)), FramePtr)
1352 .addFrameIndex(FramePtrSpillFI).addImm(0);
1353 AddDefaultCC(AddDefaultPred(MIB));
1356 // Build the new SUBri to adjust SP for integer callee-save spill area 2.
1357 emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS2Size);
1359 // Build the new SUBri to adjust SP for FP callee-save spill area.
1360 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::STR), 2, STI);
1361 emitSPUpdate(MBB, MBBI, TII, dl, -DPRCSSize);
1363 // Determine starting offsets of spill areas.
1364 unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
1365 unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
1366 unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
1367 AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
1368 AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
1369 AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
1370 AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
1372 NumBytes = DPRCSOffset;
1374 // Insert it after all the callee-save spills.
1375 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::FSTD), 3, STI);
1376 emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
1379 if (STI.isTargetELF() && hasFP(MF)) {
1380 MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
1381 AFI->getFramePtrSpillOffset());
1384 AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
1385 AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
1386 AFI->setDPRCalleeSavedAreaSize(DPRCSSize);
1389 static bool isCalleeSavedRegister(unsigned Reg, const unsigned *CSRegs) {
1390 for (unsigned i = 0; CSRegs[i]; ++i)
1391 if (Reg == CSRegs[i])
1396 static bool isCSRestore(MachineInstr *MI,
1397 const ARMBaseInstrInfo &TII,
1398 const unsigned *CSRegs) {
1399 return ((MI->getOpcode() == (int)TII.getOpcode(ARMII::FLDD) ||
1400 MI->getOpcode() == (int)TII.getOpcode(ARMII::LDR)) &&
1401 MI->getOperand(1).isFI() &&
1402 isCalleeSavedRegister(MI->getOperand(0).getReg(), CSRegs));
1405 void ARMBaseRegisterInfo::
1406 emitEpilogue(MachineFunction &MF,
1407 MachineBasicBlock &MBB) const {
1408 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1409 assert(MBBI->getOpcode() == (int)getOpcode(ARMII::BX_RET) &&
1410 "Can only insert epilog into returning blocks");
1411 DebugLoc dl = MBBI->getDebugLoc();
1412 MachineFrameInfo *MFI = MF.getFrameInfo();
1413 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1414 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1415 int NumBytes = (int)MFI->getStackSize();
1417 if (!AFI->hasStackFrame()) {
1419 emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
1421 // Unwind MBBI to point to first LDR / FLDD.
1422 const unsigned *CSRegs = getCalleeSavedRegs();
1423 if (MBBI != MBB.begin()) {
1426 while (MBBI != MBB.begin() && isCSRestore(MBBI, TII, CSRegs));
1427 if (!isCSRestore(MBBI, TII, CSRegs))
1431 // Move SP to start of FP callee save spill area.
1432 NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
1433 AFI->getGPRCalleeSavedArea2Size() +
1434 AFI->getDPRCalleeSavedAreaSize());
1436 // Darwin ABI requires FP to point to the stack slot that contains the
1438 if ((STI.isTargetDarwin() && NumBytes) || hasFP(MF)) {
1439 NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
1440 // Reset SP based on frame pointer only if the stack frame extends beyond
1441 // frame pointer stack slot or target is ELF and the function has FP.
1442 if (AFI->getGPRCalleeSavedArea2Size() ||
1443 AFI->getDPRCalleeSavedAreaSize() ||
1444 AFI->getDPRCalleeSavedAreaOffset()||
1447 BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::SUBri)), ARM::SP)
1450 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1452 BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::MOVr)), ARM::SP)
1454 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1456 } else if (NumBytes) {
1457 emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
1460 // Move SP to start of integer callee save spill area 2.
1461 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::FLDD), 3, STI);
1462 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getDPRCalleeSavedAreaSize());
1464 // Move SP to start of integer callee save spill area 1.
1465 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::LDR), 2, STI);
1466 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea2Size());
1468 // Move SP to SP upon entry to the function.
1469 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::LDR), 1, STI);
1470 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea1Size());
1474 emitSPUpdate(MBB, MBBI, TII, dl, VARegSaveSize);
1478 #include "ARMGenRegisterInfo.inc"