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/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineFrameInfo.h"
25 #include "llvm/CodeGen/MachineFunction.h"
26 #include "llvm/CodeGen/MachineInstrBuilder.h"
27 #include "llvm/CodeGen/MachineLocation.h"
28 #include "llvm/CodeGen/MachineRegisterInfo.h"
29 #include "llvm/CodeGen/RegisterScavenging.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Target/TargetFrameInfo.h"
32 #include "llvm/Target/TargetMachine.h"
33 #include "llvm/Target/TargetOptions.h"
34 #include "llvm/ADT/BitVector.h"
35 #include "llvm/ADT/SmallVector.h"
38 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
41 case R0: case S0: case D0: return 0;
42 case R1: case S1: case D1: return 1;
43 case R2: case S2: case D2: return 2;
44 case R3: case S3: case D3: return 3;
45 case R4: case S4: case D4: return 4;
46 case R5: case S5: case D5: return 5;
47 case R6: case S6: case D6: return 6;
48 case R7: case S7: case D7: return 7;
49 case R8: case S8: case D8: return 8;
50 case R9: case S9: case D9: return 9;
51 case R10: case S10: case D10: return 10;
52 case R11: case S11: case D11: return 11;
53 case R12: case S12: case D12: return 12;
54 case SP: case S13: case D13: return 13;
55 case LR: case S14: case D14: return 14;
56 case PC: case S15: case D15: return 15;
74 LLVM_UNREACHABLE("Unknown ARM register!");
78 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum,
85 LLVM_UNREACHABLE("Unknown ARM register!");
86 case R0: case D0: return 0;
87 case R1: case D1: return 1;
88 case R2: case D2: return 2;
89 case R3: case D3: return 3;
90 case R4: case D4: return 4;
91 case R5: case D5: return 5;
92 case R6: case D6: return 6;
93 case R7: case D7: return 7;
94 case R8: case D8: return 8;
95 case R9: case D9: return 9;
96 case R10: case D10: return 10;
97 case R11: case D11: return 11;
98 case R12: case D12: return 12;
99 case SP: case D13: return 13;
100 case LR: case D14: return 14;
101 case PC: case D15: return 15;
103 case S0: case S1: case S2: case S3:
104 case S4: case S5: case S6: case S7:
105 case S8: case S9: case S10: case S11:
106 case S12: case S13: case S14: case S15:
107 case S16: case S17: case S18: case S19:
108 case S20: case S21: case S22: case S23:
109 case S24: case S25: case S26: case S27:
110 case S28: case S29: case S30: case S31: {
113 default: return 0; // Avoid compile time warning.
151 ARMBaseRegisterInfo::ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
152 const ARMSubtarget &sti)
153 : ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
155 FramePtr((STI.isTargetDarwin() || STI.isThumb()) ? ARM::R7 : ARM::R11) {
159 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
160 static const unsigned CalleeSavedRegs[] = {
161 ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
162 ARM::R7, ARM::R6, ARM::R5, ARM::R4,
164 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
165 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
169 static const unsigned DarwinCalleeSavedRegs[] = {
170 // Darwin ABI deviates from ARM standard ABI. R9 is not a callee-saved
172 ARM::LR, ARM::R7, ARM::R6, ARM::R5, ARM::R4,
173 ARM::R11, ARM::R10, ARM::R8,
175 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
176 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
179 return STI.isTargetDarwin() ? DarwinCalleeSavedRegs : CalleeSavedRegs;
182 const TargetRegisterClass* const *
183 ARMBaseRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
184 static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
185 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
186 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
187 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
189 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
190 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
194 static const TargetRegisterClass * const ThumbCalleeSavedRegClasses[] = {
195 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
196 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::tGPRRegClass,
197 &ARM::tGPRRegClass,&ARM::tGPRRegClass,&ARM::tGPRRegClass,
199 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
200 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
204 static const TargetRegisterClass * const DarwinCalleeSavedRegClasses[] = {
205 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
206 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
207 &ARM::GPRRegClass, &ARM::GPRRegClass,
209 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
210 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
214 static const TargetRegisterClass * const DarwinThumbCalleeSavedRegClasses[] ={
215 &ARM::GPRRegClass, &ARM::tGPRRegClass, &ARM::tGPRRegClass,
216 &ARM::tGPRRegClass, &ARM::tGPRRegClass, &ARM::GPRRegClass,
217 &ARM::GPRRegClass, &ARM::GPRRegClass,
219 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
220 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
225 return STI.isTargetDarwin()
226 ? DarwinThumbCalleeSavedRegClasses : ThumbCalleeSavedRegClasses;
228 return STI.isTargetDarwin()
229 ? DarwinCalleeSavedRegClasses : CalleeSavedRegClasses;
232 BitVector ARMBaseRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
233 // FIXME: avoid re-calculating this everytime.
234 BitVector Reserved(getNumRegs());
235 Reserved.set(ARM::SP);
236 Reserved.set(ARM::PC);
237 if (STI.isTargetDarwin() || hasFP(MF))
238 Reserved.set(FramePtr);
239 // Some targets reserve R9.
240 if (STI.isR9Reserved())
241 Reserved.set(ARM::R9);
246 ARMBaseRegisterInfo::isReservedReg(const MachineFunction &MF, unsigned Reg) const {
254 if (FramePtr == Reg && (STI.isTargetDarwin() || hasFP(MF)))
258 return STI.isR9Reserved();
264 const TargetRegisterClass *ARMBaseRegisterInfo::getPointerRegClass() const {
265 return &ARM::GPRRegClass;
268 /// getAllocationOrder - Returns the register allocation order for a specified
269 /// register class in the form of a pair of TargetRegisterClass iterators.
270 std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator>
271 ARMBaseRegisterInfo::getAllocationOrder(const TargetRegisterClass *RC,
272 unsigned HintType, unsigned HintReg,
273 const MachineFunction &MF) const {
274 // Alternative register allocation orders when favoring even / odd registers
275 // of register pairs.
277 // No FP, R9 is available.
278 static const unsigned GPREven1[] = {
279 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8, ARM::R10,
280 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7,
283 static const unsigned GPROdd1[] = {
284 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R9, ARM::R11,
285 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
289 // FP is R7, R9 is available.
290 static const unsigned GPREven2[] = {
291 ARM::R0, ARM::R2, ARM::R4, ARM::R8, ARM::R10,
292 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6,
295 static const unsigned GPROdd2[] = {
296 ARM::R1, ARM::R3, ARM::R5, ARM::R9, ARM::R11,
297 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
301 // FP is R11, R9 is available.
302 static const unsigned GPREven3[] = {
303 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8,
304 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7,
307 static const unsigned GPROdd3[] = {
308 ARM::R1, ARM::R3, ARM::R5, ARM::R6, ARM::R9,
309 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R7,
313 // No FP, R9 is not available.
314 static const unsigned GPREven4[] = {
315 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R10,
316 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8,
319 static const unsigned GPROdd4[] = {
320 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R11,
321 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
325 // FP is R7, R9 is not available.
326 static const unsigned GPREven5[] = {
327 ARM::R0, ARM::R2, ARM::R4, ARM::R10,
328 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6, ARM::R8,
331 static const unsigned GPROdd5[] = {
332 ARM::R1, ARM::R3, ARM::R5, ARM::R11,
333 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
337 // FP is R11, R9 is not available.
338 static const unsigned GPREven6[] = {
339 ARM::R0, ARM::R2, ARM::R4, ARM::R6,
340 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8
342 static const unsigned GPROdd6[] = {
343 ARM::R1, ARM::R3, ARM::R5, ARM::R7,
344 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8
348 if (HintType == ARMRI::RegPairEven) {
349 if (isPhysicalRegister(HintReg) && getRegisterPairEven(HintReg, MF) == 0)
350 // It's no longer possible to fulfill this hint. Return the default
352 return std::make_pair(RC->allocation_order_begin(MF),
353 RC->allocation_order_end(MF));
355 if (!STI.isTargetDarwin() && !hasFP(MF)) {
356 if (!STI.isR9Reserved())
357 return std::make_pair(GPREven1,
358 GPREven1 + (sizeof(GPREven1)/sizeof(unsigned)));
360 return std::make_pair(GPREven4,
361 GPREven4 + (sizeof(GPREven4)/sizeof(unsigned)));
362 } else if (FramePtr == ARM::R7) {
363 if (!STI.isR9Reserved())
364 return std::make_pair(GPREven2,
365 GPREven2 + (sizeof(GPREven2)/sizeof(unsigned)));
367 return std::make_pair(GPREven5,
368 GPREven5 + (sizeof(GPREven5)/sizeof(unsigned)));
369 } else { // FramePtr == ARM::R11
370 if (!STI.isR9Reserved())
371 return std::make_pair(GPREven3,
372 GPREven3 + (sizeof(GPREven3)/sizeof(unsigned)));
374 return std::make_pair(GPREven6,
375 GPREven6 + (sizeof(GPREven6)/sizeof(unsigned)));
377 } else if (HintType == ARMRI::RegPairOdd) {
378 if (isPhysicalRegister(HintReg) && getRegisterPairOdd(HintReg, MF) == 0)
379 // It's no longer possible to fulfill this hint. Return the default
381 return std::make_pair(RC->allocation_order_begin(MF),
382 RC->allocation_order_end(MF));
384 if (!STI.isTargetDarwin() && !hasFP(MF)) {
385 if (!STI.isR9Reserved())
386 return std::make_pair(GPROdd1,
387 GPROdd1 + (sizeof(GPROdd1)/sizeof(unsigned)));
389 return std::make_pair(GPROdd4,
390 GPROdd4 + (sizeof(GPROdd4)/sizeof(unsigned)));
391 } else if (FramePtr == ARM::R7) {
392 if (!STI.isR9Reserved())
393 return std::make_pair(GPROdd2,
394 GPROdd2 + (sizeof(GPROdd2)/sizeof(unsigned)));
396 return std::make_pair(GPROdd5,
397 GPROdd5 + (sizeof(GPROdd5)/sizeof(unsigned)));
398 } else { // FramePtr == ARM::R11
399 if (!STI.isR9Reserved())
400 return std::make_pair(GPROdd3,
401 GPROdd3 + (sizeof(GPROdd3)/sizeof(unsigned)));
403 return std::make_pair(GPROdd6,
404 GPROdd6 + (sizeof(GPROdd6)/sizeof(unsigned)));
407 return std::make_pair(RC->allocation_order_begin(MF),
408 RC->allocation_order_end(MF));
411 /// ResolveRegAllocHint - Resolves the specified register allocation hint
412 /// to a physical register. Returns the physical register if it is successful.
414 ARMBaseRegisterInfo::ResolveRegAllocHint(unsigned Type, unsigned Reg,
415 const MachineFunction &MF) const {
416 if (Reg == 0 || !isPhysicalRegister(Reg))
420 else if (Type == (unsigned)ARMRI::RegPairOdd)
422 return getRegisterPairOdd(Reg, MF);
423 else if (Type == (unsigned)ARMRI::RegPairEven)
425 return getRegisterPairEven(Reg, MF);
430 ARMBaseRegisterInfo::UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
431 MachineFunction &MF) const {
432 MachineRegisterInfo *MRI = &MF.getRegInfo();
433 std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(Reg);
434 if ((Hint.first == (unsigned)ARMRI::RegPairOdd ||
435 Hint.first == (unsigned)ARMRI::RegPairEven) &&
436 Hint.second && TargetRegisterInfo::isVirtualRegister(Hint.second)) {
437 // If 'Reg' is one of the even / odd register pair and it's now changed
438 // (e.g. coalesced) into a different register. The other register of the
439 // pair allocation hint must be updated to reflect the relationship
441 unsigned OtherReg = Hint.second;
442 Hint = MRI->getRegAllocationHint(OtherReg);
443 if (Hint.second == Reg)
444 // Make sure the pair has not already divorced.
445 MRI->setRegAllocationHint(OtherReg, Hint.first, NewReg);
449 /// hasFP - Return true if the specified function should have a dedicated frame
450 /// pointer register. This is true if the function has variable sized allocas
451 /// or if frame pointer elimination is disabled.
453 bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
454 const MachineFrameInfo *MFI = MF.getFrameInfo();
455 return (NoFramePointerElim ||
456 MFI->hasVarSizedObjects() ||
457 MFI->isFrameAddressTaken());
460 static unsigned estimateStackSize(MachineFunction &MF, MachineFrameInfo *MFI) {
461 const MachineFrameInfo *FFI = MF.getFrameInfo();
463 for (int i = FFI->getObjectIndexBegin(); i != 0; ++i) {
464 int FixedOff = -FFI->getObjectOffset(i);
465 if (FixedOff > Offset) Offset = FixedOff;
467 for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
468 if (FFI->isDeadObjectIndex(i))
470 Offset += FFI->getObjectSize(i);
471 unsigned Align = FFI->getObjectAlignment(i);
472 // Adjust to alignment boundary
473 Offset = (Offset+Align-1)/Align*Align;
475 return (unsigned)Offset;
479 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
480 RegScavenger *RS) const {
481 // This tells PEI to spill the FP as if it is any other callee-save register
482 // to take advantage the eliminateFrameIndex machinery. This also ensures it
483 // is spilled in the order specified by getCalleeSavedRegs() to make it easier
484 // to combine multiple loads / stores.
485 bool CanEliminateFrame = true;
486 bool CS1Spilled = false;
487 bool LRSpilled = false;
488 unsigned NumGPRSpills = 0;
489 SmallVector<unsigned, 4> UnspilledCS1GPRs;
490 SmallVector<unsigned, 4> UnspilledCS2GPRs;
491 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
493 // Don't spill FP if the frame can be eliminated. This is determined
494 // by scanning the callee-save registers to see if any is used.
495 const unsigned *CSRegs = getCalleeSavedRegs();
496 const TargetRegisterClass* const *CSRegClasses = getCalleeSavedRegClasses();
497 for (unsigned i = 0; CSRegs[i]; ++i) {
498 unsigned Reg = CSRegs[i];
499 bool Spilled = false;
500 if (MF.getRegInfo().isPhysRegUsed(Reg)) {
501 AFI->setCSRegisterIsSpilled(Reg);
503 CanEliminateFrame = false;
505 // Check alias registers too.
506 for (const unsigned *Aliases = getAliasSet(Reg); *Aliases; ++Aliases) {
507 if (MF.getRegInfo().isPhysRegUsed(*Aliases)) {
509 CanEliminateFrame = false;
514 if (CSRegClasses[i] == &ARM::GPRRegClass) {
518 if (!STI.isTargetDarwin()) {
525 // Keep track if LR and any of R4, R5, R6, and R7 is spilled.
540 if (!STI.isTargetDarwin()) {
541 UnspilledCS1GPRs.push_back(Reg);
551 UnspilledCS1GPRs.push_back(Reg);
554 UnspilledCS2GPRs.push_back(Reg);
561 bool ForceLRSpill = false;
562 if (!LRSpilled && AFI->isThumbFunction()) {
563 unsigned FnSize = TII.GetFunctionSizeInBytes(MF);
564 // Force LR to be spilled if the Thumb function size is > 2048. This enables
565 // use of BL to implement far jump. If it turns out that it's not needed
566 // then the branch fix up path will undo it.
567 if (FnSize >= (1 << 11)) {
568 CanEliminateFrame = false;
573 bool ExtraCSSpill = false;
574 if (!CanEliminateFrame || hasFP(MF)) {
575 AFI->setHasStackFrame(true);
577 // If LR is not spilled, but at least one of R4, R5, R6, and R7 is spilled.
578 // Spill LR as well so we can fold BX_RET to the registers restore (LDM).
579 if (!LRSpilled && CS1Spilled) {
580 MF.getRegInfo().setPhysRegUsed(ARM::LR);
581 AFI->setCSRegisterIsSpilled(ARM::LR);
583 UnspilledCS1GPRs.erase(std::find(UnspilledCS1GPRs.begin(),
584 UnspilledCS1GPRs.end(), (unsigned)ARM::LR));
585 ForceLRSpill = false;
589 // Darwin ABI requires FP to point to the stack slot that contains the
591 if (STI.isTargetDarwin() || hasFP(MF)) {
592 MF.getRegInfo().setPhysRegUsed(FramePtr);
596 // If stack and double are 8-byte aligned and we are spilling an odd number
597 // of GPRs. Spill one extra callee save GPR so we won't have to pad between
598 // the integer and double callee save areas.
599 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
600 if (TargetAlign == 8 && (NumGPRSpills & 1)) {
601 if (CS1Spilled && !UnspilledCS1GPRs.empty()) {
602 for (unsigned i = 0, e = UnspilledCS1GPRs.size(); i != e; ++i) {
603 unsigned Reg = UnspilledCS1GPRs[i];
604 // Don't spiil high register if the function is thumb
605 if (!AFI->isThumbFunction() ||
606 isARMLowRegister(Reg) || Reg == ARM::LR) {
607 MF.getRegInfo().setPhysRegUsed(Reg);
608 AFI->setCSRegisterIsSpilled(Reg);
609 if (!isReservedReg(MF, Reg))
614 } else if (!UnspilledCS2GPRs.empty() &&
615 !AFI->isThumbFunction()) {
616 unsigned Reg = UnspilledCS2GPRs.front();
617 MF.getRegInfo().setPhysRegUsed(Reg);
618 AFI->setCSRegisterIsSpilled(Reg);
619 if (!isReservedReg(MF, Reg))
624 // Estimate if we might need to scavenge a register at some point in order
625 // to materialize a stack offset. If so, either spill one additional
626 // callee-saved register or reserve a special spill slot to facilitate
627 // register scavenging.
628 if (RS && !ExtraCSSpill && !AFI->isThumbFunction()) {
629 MachineFrameInfo *MFI = MF.getFrameInfo();
630 unsigned Size = estimateStackSize(MF, MFI);
631 unsigned Limit = (1 << 12) - 1;
632 for (MachineFunction::iterator BB = MF.begin(),E = MF.end();BB != E; ++BB)
633 for (MachineBasicBlock::iterator I= BB->begin(); I != BB->end(); ++I) {
634 for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
635 if (I->getOperand(i).isFI()) {
636 unsigned Opcode = I->getOpcode();
637 const TargetInstrDesc &Desc = TII.get(Opcode);
638 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
639 if (AddrMode == ARMII::AddrMode3) {
640 Limit = (1 << 8) - 1;
642 } else if (AddrMode == ARMII::AddrMode5) {
643 unsigned ThisLimit = ((1 << 8) - 1) * 4;
644 if (ThisLimit < Limit)
651 // If any non-reserved CS register isn't spilled, just spill one or two
652 // extra. That should take care of it!
653 unsigned NumExtras = TargetAlign / 4;
654 SmallVector<unsigned, 2> Extras;
655 while (NumExtras && !UnspilledCS1GPRs.empty()) {
656 unsigned Reg = UnspilledCS1GPRs.back();
657 UnspilledCS1GPRs.pop_back();
658 if (!isReservedReg(MF, Reg)) {
659 Extras.push_back(Reg);
663 while (NumExtras && !UnspilledCS2GPRs.empty()) {
664 unsigned Reg = UnspilledCS2GPRs.back();
665 UnspilledCS2GPRs.pop_back();
666 if (!isReservedReg(MF, Reg)) {
667 Extras.push_back(Reg);
671 if (Extras.size() && NumExtras == 0) {
672 for (unsigned i = 0, e = Extras.size(); i != e; ++i) {
673 MF.getRegInfo().setPhysRegUsed(Extras[i]);
674 AFI->setCSRegisterIsSpilled(Extras[i]);
677 // Reserve a slot closest to SP or frame pointer.
678 const TargetRegisterClass *RC = &ARM::GPRRegClass;
679 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
680 RC->getAlignment()));
687 MF.getRegInfo().setPhysRegUsed(ARM::LR);
688 AFI->setCSRegisterIsSpilled(ARM::LR);
689 AFI->setLRIsSpilledForFarJump(true);
693 unsigned ARMBaseRegisterInfo::getRARegister() const {
697 unsigned ARMBaseRegisterInfo::getFrameRegister(MachineFunction &MF) const {
698 if (STI.isTargetDarwin() || hasFP(MF))
703 unsigned ARMBaseRegisterInfo::getEHExceptionRegister() const {
704 assert(0 && "What is the exception register");
708 unsigned ARMBaseRegisterInfo::getEHHandlerRegister() const {
709 assert(0 && "What is the exception handler register");
713 int ARMBaseRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
714 return ARMGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
717 unsigned ARMBaseRegisterInfo::getRegisterPairEven(unsigned Reg,
718 const MachineFunction &MF) const {
721 // Return 0 if either register of the pair is a special register.
727 return STI.isThumb() ? 0 : ARM::R2;
731 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R6;
733 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R8;
735 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R10;
791 unsigned ARMBaseRegisterInfo::getRegisterPairOdd(unsigned Reg,
792 const MachineFunction &MF) const {
795 // Return 0 if either register of the pair is a special register.
801 return STI.isThumb() ? 0 : ARM::R3;
805 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R7;
807 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R9;
809 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R11;
867 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
868 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
872 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
873 return MIB.addReg(0);
876 /// emitLoadConstPool - Emits a load from constpool to materialize the
877 /// specified immediate.
878 void ARMBaseRegisterInfo::
879 emitLoadConstPool(MachineBasicBlock &MBB,
880 MachineBasicBlock::iterator &MBBI,
881 const TargetInstrInfo *TII, DebugLoc dl,
882 unsigned DestReg, int Val,
883 ARMCC::CondCodes Pred,
884 unsigned PredReg) const {
885 MachineFunction &MF = *MBB.getParent();
886 MachineConstantPool *ConstantPool = MF.getConstantPool();
887 Constant *C = ConstantInt::get(Type::Int32Ty, Val);
888 unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
890 BuildMI(MBB, MBBI, dl, TII->get(ARM::LDRcp), DestReg)
891 .addConstantPoolIndex(Idx)
892 .addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
895 bool ARMBaseRegisterInfo::
896 requiresRegisterScavenging(const MachineFunction &MF) const {
900 // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
901 // not required, we reserve argument space for call sites in the function
902 // immediately on entry to the current function. This eliminates the need for
903 // add/sub sp brackets around call sites. Returns true if the call frame is
904 // included as part of the stack frame.
905 bool ARMBaseRegisterInfo::
906 hasReservedCallFrame(MachineFunction &MF) const {
907 const MachineFrameInfo *FFI = MF.getFrameInfo();
908 unsigned CFSize = FFI->getMaxCallFrameSize();
909 // It's not always a good idea to include the call frame as part of the
910 // stack frame. ARM (especially Thumb) has small immediate offset to
911 // address the stack frame. So a large call frame can cause poor codegen
912 // and may even makes it impossible to scavenge a register.
913 if (CFSize >= ((1 << 12) - 1) / 2) // Half of imm12
916 return !MF.getFrameInfo()->hasVarSizedObjects();
919 /// emitARMRegPlusImmediate - Emits a series of instructions to materialize
920 /// a destreg = basereg + immediate in ARM code.
922 void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
923 MachineBasicBlock::iterator &MBBI,
924 unsigned DestReg, unsigned BaseReg, int NumBytes,
925 ARMCC::CondCodes Pred, unsigned PredReg,
926 const TargetInstrInfo &TII,
928 bool isSub = NumBytes < 0;
929 if (isSub) NumBytes = -NumBytes;
932 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
933 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
934 assert(ThisVal && "Didn't extract field correctly");
936 // We will handle these bits from offset, clear them.
937 NumBytes &= ~ThisVal;
939 // Get the properly encoded SOImmVal field.
940 int SOImmVal = ARM_AM::getSOImmVal(ThisVal);
941 assert(SOImmVal != -1 && "Bit extraction didn't work?");
943 // Build the new ADD / SUB.
944 BuildMI(MBB, MBBI, dl, TII.get(isSub ? ARM::SUBri : ARM::ADDri), DestReg)
945 .addReg(BaseReg, RegState::Kill).addImm(SOImmVal)
946 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
952 emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
953 const TargetInstrInfo &TII, DebugLoc dl,
955 ARMCC::CondCodes Pred = ARMCC::AL, unsigned PredReg = 0) {
956 emitARMRegPlusImmediate(MBB, MBBI, ARM::SP, ARM::SP, NumBytes,
957 Pred, PredReg, TII, dl);
960 void ARMBaseRegisterInfo::
961 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
962 MachineBasicBlock::iterator I) const {
963 if (!hasReservedCallFrame(MF)) {
964 // If we have alloca, convert as follows:
965 // ADJCALLSTACKDOWN -> sub, sp, sp, amount
966 // ADJCALLSTACKUP -> add, sp, sp, amount
967 MachineInstr *Old = I;
968 DebugLoc dl = Old->getDebugLoc();
969 unsigned Amount = Old->getOperand(0).getImm();
971 // We need to keep the stack aligned properly. To do this, we round the
972 // amount of space needed for the outgoing arguments up to the next
973 // alignment boundary.
974 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
975 Amount = (Amount+Align-1)/Align*Align;
977 // Replace the pseudo instruction with a new instruction...
978 unsigned Opc = Old->getOpcode();
979 ARMCC::CondCodes Pred = (ARMCC::CondCodes)Old->getOperand(1).getImm();
980 if (Opc == ARM::ADJCALLSTACKDOWN || Opc == ARM::tADJCALLSTACKDOWN) {
981 // Note: PredReg is operand 2 for ADJCALLSTACKDOWN.
982 unsigned PredReg = Old->getOperand(2).getReg();
983 emitSPUpdate(MBB, I, TII, dl, -Amount, Pred, PredReg);
985 // Note: PredReg is operand 3 for ADJCALLSTACKUP.
986 unsigned PredReg = Old->getOperand(3).getReg();
987 assert(Opc == ARM::ADJCALLSTACKUP || Opc == ARM::tADJCALLSTACKUP);
988 emitSPUpdate(MBB, I, TII, dl, Amount, Pred, PredReg);
995 /// findScratchRegister - Find a 'free' ARM register. If register scavenger
996 /// is not being used, R12 is available. Otherwise, try for a call-clobbered
997 /// register first and then a spilled callee-saved register if that fails.
999 unsigned findScratchRegister(RegScavenger *RS, const TargetRegisterClass *RC,
1000 ARMFunctionInfo *AFI) {
1001 unsigned Reg = RS ? RS->FindUnusedReg(RC, true) : (unsigned) ARM::R12;
1002 assert (!AFI->isThumbFunction());
1004 // Try a already spilled CS register.
1005 Reg = RS->FindUnusedReg(RC, AFI->getSpilledCSRegisters());
1010 void ARMBaseRegisterInfo::
1011 eliminateFrameIndex(MachineBasicBlock::iterator II,
1012 int SPAdj, RegScavenger *RS) const{
1014 MachineInstr &MI = *II;
1015 MachineBasicBlock &MBB = *MI.getParent();
1016 MachineFunction &MF = *MBB.getParent();
1017 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1018 DebugLoc dl = MI.getDebugLoc();
1020 while (!MI.getOperand(i).isFI()) {
1022 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
1025 unsigned FrameReg = ARM::SP;
1026 int FrameIndex = MI.getOperand(i).getIndex();
1027 int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
1028 MF.getFrameInfo()->getStackSize() + SPAdj;
1030 if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
1031 Offset -= AFI->getGPRCalleeSavedArea1Offset();
1032 else if (AFI->isGPRCalleeSavedArea2Frame(FrameIndex))
1033 Offset -= AFI->getGPRCalleeSavedArea2Offset();
1034 else if (AFI->isDPRCalleeSavedAreaFrame(FrameIndex))
1035 Offset -= AFI->getDPRCalleeSavedAreaOffset();
1036 else if (hasFP(MF)) {
1037 assert(SPAdj == 0 && "Unexpected");
1038 // There is alloca()'s in this function, must reference off the frame
1040 FrameReg = getFrameRegister(MF);
1041 Offset -= AFI->getFramePtrSpillOffset();
1044 unsigned Opcode = MI.getOpcode();
1045 const TargetInstrDesc &Desc = MI.getDesc();
1046 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
1049 // Memory operands in inline assembly always use AddrMode2.
1050 if (Opcode == ARM::INLINEASM)
1051 AddrMode = ARMII::AddrMode2;
1053 if (Opcode == ARM::ADDri) {
1054 Offset += MI.getOperand(i+1).getImm();
1056 // Turn it into a move.
1057 MI.setDesc(TII.get(ARM::MOVr));
1058 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1059 MI.RemoveOperand(i+1);
1061 } else if (Offset < 0) {
1064 MI.setDesc(TII.get(ARM::SUBri));
1067 // Common case: small offset, fits into instruction.
1068 int ImmedOffset = ARM_AM::getSOImmVal(Offset);
1069 if (ImmedOffset != -1) {
1070 // Replace the FrameIndex with sp / fp
1071 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1072 MI.getOperand(i+1).ChangeToImmediate(ImmedOffset);
1076 // Otherwise, we fallback to common code below to form the imm offset with
1077 // a sequence of ADDri instructions. First though, pull as much of the imm
1078 // into this ADDri as possible.
1079 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
1080 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
1082 // We will handle these bits from offset, clear them.
1083 Offset &= ~ThisImmVal;
1085 // Get the properly encoded SOImmVal field.
1086 int ThisSOImmVal = ARM_AM::getSOImmVal(ThisImmVal);
1087 assert(ThisSOImmVal != -1 && "Bit extraction didn't work?");
1088 MI.getOperand(i+1).ChangeToImmediate(ThisSOImmVal);
1090 unsigned ImmIdx = 0;
1092 unsigned NumBits = 0;
1095 case ARMII::AddrMode2: {
1097 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
1098 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1103 case ARMII::AddrMode3: {
1105 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
1106 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1111 case ARMII::AddrMode5: {
1113 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
1114 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1121 LLVM_UNREACHABLE("Unsupported addressing mode!");
1125 Offset += InstrOffs * Scale;
1126 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
1132 // Common case: small offset, fits into instruction.
1133 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
1134 int ImmedOffset = Offset / Scale;
1135 unsigned Mask = (1 << NumBits) - 1;
1136 if ((unsigned)Offset <= Mask * Scale) {
1137 // Replace the FrameIndex with sp
1138 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1140 ImmedOffset |= 1 << NumBits;
1141 ImmOp.ChangeToImmediate(ImmedOffset);
1145 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
1146 ImmedOffset = ImmedOffset & Mask;
1148 ImmedOffset |= 1 << NumBits;
1149 ImmOp.ChangeToImmediate(ImmedOffset);
1150 Offset &= ~(Mask*Scale);
1153 // If we get here, the immediate doesn't fit into the instruction. We folded
1154 // as much as possible above, handle the rest, providing a register that is
1156 assert(Offset && "This code isn't needed if offset already handled!");
1158 // Insert a set of r12 with the full address: r12 = sp + offset
1159 // If the offset we have is too large to fit into the instruction, we need
1160 // to form it with a series of ADDri's. Do this by taking 8-bit chunks
1162 unsigned ScratchReg = findScratchRegister(RS, &ARM::GPRRegClass, AFI);
1163 if (ScratchReg == 0)
1164 // No register is "free". Scavenge a register.
1165 ScratchReg = RS->scavengeRegister(&ARM::GPRRegClass, II, SPAdj);
1166 int PIdx = MI.findFirstPredOperandIdx();
1167 ARMCC::CondCodes Pred = (PIdx == -1)
1168 ? ARMCC::AL : (ARMCC::CondCodes)MI.getOperand(PIdx).getImm();
1169 unsigned PredReg = (PIdx == -1) ? 0 : MI.getOperand(PIdx+1).getReg();
1170 emitARMRegPlusImmediate(MBB, II, ScratchReg, FrameReg,
1171 isSub ? -Offset : Offset, Pred, PredReg, TII, dl);
1172 MI.getOperand(i).ChangeToRegister(ScratchReg, false, false, true);
1175 /// Move iterator pass the next bunch of callee save load / store ops for
1176 /// the particular spill area (1: integer area 1, 2: integer area 2,
1177 /// 3: fp area, 0: don't care).
1178 static void movePastCSLoadStoreOps(MachineBasicBlock &MBB,
1179 MachineBasicBlock::iterator &MBBI,
1180 int Opc, unsigned Area,
1181 const ARMSubtarget &STI) {
1182 while (MBBI != MBB.end() &&
1183 MBBI->getOpcode() == Opc && MBBI->getOperand(1).isFI()) {
1186 unsigned Category = 0;
1187 switch (MBBI->getOperand(0).getReg()) {
1188 case ARM::R4: case ARM::R5: case ARM::R6: case ARM::R7:
1192 case ARM::R8: case ARM::R9: case ARM::R10: case ARM::R11:
1193 Category = STI.isTargetDarwin() ? 2 : 1;
1195 case ARM::D8: case ARM::D9: case ARM::D10: case ARM::D11:
1196 case ARM::D12: case ARM::D13: case ARM::D14: case ARM::D15:
1203 if (Done || Category != Area)
1211 void ARMBaseRegisterInfo::
1212 emitPrologue(MachineFunction &MF) const {
1213 MachineBasicBlock &MBB = MF.front();
1214 MachineBasicBlock::iterator MBBI = MBB.begin();
1215 MachineFrameInfo *MFI = MF.getFrameInfo();
1216 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1217 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1218 unsigned NumBytes = MFI->getStackSize();
1219 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1220 DebugLoc dl = (MBBI != MBB.end() ?
1221 MBBI->getDebugLoc() : DebugLoc::getUnknownLoc());
1223 // Determine the sizes of each callee-save spill areas and record which frame
1224 // belongs to which callee-save spill areas.
1225 unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
1226 int FramePtrSpillFI = 0;
1229 emitSPUpdate(MBB, MBBI, TII, dl, -VARegSaveSize);
1231 if (!AFI->hasStackFrame()) {
1233 emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
1237 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1238 unsigned Reg = CSI[i].getReg();
1239 int FI = CSI[i].getFrameIdx();
1246 if (Reg == FramePtr)
1247 FramePtrSpillFI = FI;
1248 AFI->addGPRCalleeSavedArea1Frame(FI);
1255 if (Reg == FramePtr)
1256 FramePtrSpillFI = FI;
1257 if (STI.isTargetDarwin()) {
1258 AFI->addGPRCalleeSavedArea2Frame(FI);
1261 AFI->addGPRCalleeSavedArea1Frame(FI);
1266 AFI->addDPRCalleeSavedAreaFrame(FI);
1271 // Build the new SUBri to adjust SP for integer callee-save spill area 1.
1272 emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS1Size);
1273 movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 1, STI);
1275 // Darwin ABI requires FP to point to the stack slot that contains the
1277 if (STI.isTargetDarwin() || hasFP(MF)) {
1278 MachineInstrBuilder MIB =
1279 BuildMI(MBB, MBBI, dl, TII.get(ARM::ADDri), FramePtr)
1280 .addFrameIndex(FramePtrSpillFI).addImm(0);
1281 AddDefaultCC(AddDefaultPred(MIB));
1284 // Build the new SUBri to adjust SP for integer callee-save spill area 2.
1285 emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS2Size);
1287 // Build the new SUBri to adjust SP for FP callee-save spill area.
1288 movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 2, STI);
1289 emitSPUpdate(MBB, MBBI, TII, dl, -DPRCSSize);
1291 // Determine starting offsets of spill areas.
1292 unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
1293 unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
1294 unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
1295 AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
1296 AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
1297 AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
1298 AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
1300 NumBytes = DPRCSOffset;
1302 // Insert it after all the callee-save spills.
1303 movePastCSLoadStoreOps(MBB, MBBI, ARM::FSTD, 3, STI);
1304 emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
1307 if (STI.isTargetELF() && hasFP(MF)) {
1308 MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
1309 AFI->getFramePtrSpillOffset());
1312 AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
1313 AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
1314 AFI->setDPRCalleeSavedAreaSize(DPRCSSize);
1317 static bool isCalleeSavedRegister(unsigned Reg, const unsigned *CSRegs) {
1318 for (unsigned i = 0; CSRegs[i]; ++i)
1319 if (Reg == CSRegs[i])
1324 static bool isCSRestore(MachineInstr *MI, const unsigned *CSRegs) {
1325 return ((MI->getOpcode() == ARM::FLDD ||
1326 MI->getOpcode() == ARM::LDR) &&
1327 MI->getOperand(1).isFI() &&
1328 isCalleeSavedRegister(MI->getOperand(0).getReg(), CSRegs));
1331 void ARMBaseRegisterInfo::
1332 emitEpilogue(MachineFunction &MF,
1333 MachineBasicBlock &MBB) const {
1334 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1335 assert(MBBI->getOpcode() == ARM::BX_RET &&
1336 "Can only insert epilog into returning blocks");
1337 DebugLoc dl = MBBI->getDebugLoc();
1338 MachineFrameInfo *MFI = MF.getFrameInfo();
1339 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1340 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1341 int NumBytes = (int)MFI->getStackSize();
1343 if (!AFI->hasStackFrame()) {
1345 emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
1347 // Unwind MBBI to point to first LDR / FLDD.
1348 const unsigned *CSRegs = getCalleeSavedRegs();
1349 if (MBBI != MBB.begin()) {
1352 while (MBBI != MBB.begin() && isCSRestore(MBBI, CSRegs));
1353 if (!isCSRestore(MBBI, CSRegs))
1357 // Move SP to start of FP callee save spill area.
1358 NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
1359 AFI->getGPRCalleeSavedArea2Size() +
1360 AFI->getDPRCalleeSavedAreaSize());
1362 // Darwin ABI requires FP to point to the stack slot that contains the
1364 if ((STI.isTargetDarwin() && NumBytes) || hasFP(MF)) {
1365 NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
1366 // Reset SP based on frame pointer only if the stack frame extends beyond
1367 // frame pointer stack slot or target is ELF and the function has FP.
1368 if (AFI->getGPRCalleeSavedArea2Size() ||
1369 AFI->getDPRCalleeSavedAreaSize() ||
1370 AFI->getDPRCalleeSavedAreaOffset()||
1373 BuildMI(MBB, MBBI, dl, TII.get(ARM::SUBri), ARM::SP).addReg(FramePtr)
1375 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1377 BuildMI(MBB, MBBI, dl, TII.get(ARM::MOVr), ARM::SP).addReg(FramePtr)
1378 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1380 } else if (NumBytes) {
1381 emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
1384 // Move SP to start of integer callee save spill area 2.
1385 movePastCSLoadStoreOps(MBB, MBBI, ARM::FLDD, 3, STI);
1386 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getDPRCalleeSavedAreaSize());
1388 // Move SP to start of integer callee save spill area 1.
1389 movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 2, STI);
1390 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea2Size());
1392 // Move SP to SP upon entry to the function.
1393 movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 1, STI);
1394 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea1Size());
1398 emitSPUpdate(MBB, MBBI, TII, dl, VARegSaveSize);
1402 #include "ARMGenRegisterInfo.inc"