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) {
158 unsigned ARMBaseRegisterInfo::
159 getOpcode(int Op) const {
160 return TII.getOpcode((ARMII::Op)Op);
164 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
165 static const unsigned CalleeSavedRegs[] = {
166 ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
167 ARM::R7, ARM::R6, ARM::R5, ARM::R4,
169 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
170 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
174 static const unsigned DarwinCalleeSavedRegs[] = {
175 // Darwin ABI deviates from ARM standard ABI. R9 is not a callee-saved
177 ARM::LR, ARM::R7, ARM::R6, ARM::R5, ARM::R4,
178 ARM::R11, ARM::R10, ARM::R8,
180 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
181 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
184 return STI.isTargetDarwin() ? DarwinCalleeSavedRegs : CalleeSavedRegs;
187 const TargetRegisterClass* const *
188 ARMBaseRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
189 static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
190 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
191 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
192 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
194 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
195 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
199 static const TargetRegisterClass * const ThumbCalleeSavedRegClasses[] = {
200 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
201 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::tGPRRegClass,
202 &ARM::tGPRRegClass,&ARM::tGPRRegClass,&ARM::tGPRRegClass,
204 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
205 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
209 static const TargetRegisterClass * const DarwinCalleeSavedRegClasses[] = {
210 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
211 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
212 &ARM::GPRRegClass, &ARM::GPRRegClass,
214 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
215 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
219 static const TargetRegisterClass * const DarwinThumbCalleeSavedRegClasses[] ={
220 &ARM::GPRRegClass, &ARM::tGPRRegClass, &ARM::tGPRRegClass,
221 &ARM::tGPRRegClass, &ARM::tGPRRegClass, &ARM::GPRRegClass,
222 &ARM::GPRRegClass, &ARM::GPRRegClass,
224 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
225 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
230 return STI.isTargetDarwin()
231 ? DarwinThumbCalleeSavedRegClasses : ThumbCalleeSavedRegClasses;
233 return STI.isTargetDarwin()
234 ? DarwinCalleeSavedRegClasses : CalleeSavedRegClasses;
237 BitVector ARMBaseRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
238 // FIXME: avoid re-calculating this everytime.
239 BitVector Reserved(getNumRegs());
240 Reserved.set(ARM::SP);
241 Reserved.set(ARM::PC);
242 if (STI.isTargetDarwin() || hasFP(MF))
243 Reserved.set(FramePtr);
244 // Some targets reserve R9.
245 if (STI.isR9Reserved())
246 Reserved.set(ARM::R9);
251 ARMBaseRegisterInfo::isReservedReg(const MachineFunction &MF, unsigned Reg) const {
259 if (FramePtr == Reg && (STI.isTargetDarwin() || hasFP(MF)))
263 return STI.isR9Reserved();
269 const TargetRegisterClass *ARMBaseRegisterInfo::getPointerRegClass() const {
270 return &ARM::GPRRegClass;
273 /// getAllocationOrder - Returns the register allocation order for a specified
274 /// register class in the form of a pair of TargetRegisterClass iterators.
275 std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator>
276 ARMBaseRegisterInfo::getAllocationOrder(const TargetRegisterClass *RC,
277 unsigned HintType, unsigned HintReg,
278 const MachineFunction &MF) const {
279 // Alternative register allocation orders when favoring even / odd registers
280 // of register pairs.
282 // No FP, R9 is available.
283 static const unsigned GPREven1[] = {
284 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8, ARM::R10,
285 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7,
288 static const unsigned GPROdd1[] = {
289 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R9, ARM::R11,
290 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
294 // FP is R7, R9 is available.
295 static const unsigned GPREven2[] = {
296 ARM::R0, ARM::R2, ARM::R4, ARM::R8, ARM::R10,
297 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6,
300 static const unsigned GPROdd2[] = {
301 ARM::R1, ARM::R3, ARM::R5, ARM::R9, ARM::R11,
302 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
306 // FP is R11, R9 is available.
307 static const unsigned GPREven3[] = {
308 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8,
309 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7,
312 static const unsigned GPROdd3[] = {
313 ARM::R1, ARM::R3, ARM::R5, ARM::R6, ARM::R9,
314 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R7,
318 // No FP, R9 is not available.
319 static const unsigned GPREven4[] = {
320 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R10,
321 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8,
324 static const unsigned GPROdd4[] = {
325 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R11,
326 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
330 // FP is R7, R9 is not available.
331 static const unsigned GPREven5[] = {
332 ARM::R0, ARM::R2, ARM::R4, ARM::R10,
333 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6, ARM::R8,
336 static const unsigned GPROdd5[] = {
337 ARM::R1, ARM::R3, ARM::R5, ARM::R11,
338 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
342 // FP is R11, R9 is not available.
343 static const unsigned GPREven6[] = {
344 ARM::R0, ARM::R2, ARM::R4, ARM::R6,
345 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8
347 static const unsigned GPROdd6[] = {
348 ARM::R1, ARM::R3, ARM::R5, ARM::R7,
349 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8
353 if (HintType == ARMRI::RegPairEven) {
354 if (isPhysicalRegister(HintReg) && getRegisterPairEven(HintReg, MF) == 0)
355 // It's no longer possible to fulfill this hint. Return the default
357 return std::make_pair(RC->allocation_order_begin(MF),
358 RC->allocation_order_end(MF));
360 if (!STI.isTargetDarwin() && !hasFP(MF)) {
361 if (!STI.isR9Reserved())
362 return std::make_pair(GPREven1,
363 GPREven1 + (sizeof(GPREven1)/sizeof(unsigned)));
365 return std::make_pair(GPREven4,
366 GPREven4 + (sizeof(GPREven4)/sizeof(unsigned)));
367 } else if (FramePtr == ARM::R7) {
368 if (!STI.isR9Reserved())
369 return std::make_pair(GPREven2,
370 GPREven2 + (sizeof(GPREven2)/sizeof(unsigned)));
372 return std::make_pair(GPREven5,
373 GPREven5 + (sizeof(GPREven5)/sizeof(unsigned)));
374 } else { // FramePtr == ARM::R11
375 if (!STI.isR9Reserved())
376 return std::make_pair(GPREven3,
377 GPREven3 + (sizeof(GPREven3)/sizeof(unsigned)));
379 return std::make_pair(GPREven6,
380 GPREven6 + (sizeof(GPREven6)/sizeof(unsigned)));
382 } else if (HintType == ARMRI::RegPairOdd) {
383 if (isPhysicalRegister(HintReg) && getRegisterPairOdd(HintReg, MF) == 0)
384 // It's no longer possible to fulfill this hint. Return the default
386 return std::make_pair(RC->allocation_order_begin(MF),
387 RC->allocation_order_end(MF));
389 if (!STI.isTargetDarwin() && !hasFP(MF)) {
390 if (!STI.isR9Reserved())
391 return std::make_pair(GPROdd1,
392 GPROdd1 + (sizeof(GPROdd1)/sizeof(unsigned)));
394 return std::make_pair(GPROdd4,
395 GPROdd4 + (sizeof(GPROdd4)/sizeof(unsigned)));
396 } else if (FramePtr == ARM::R7) {
397 if (!STI.isR9Reserved())
398 return std::make_pair(GPROdd2,
399 GPROdd2 + (sizeof(GPROdd2)/sizeof(unsigned)));
401 return std::make_pair(GPROdd5,
402 GPROdd5 + (sizeof(GPROdd5)/sizeof(unsigned)));
403 } else { // FramePtr == ARM::R11
404 if (!STI.isR9Reserved())
405 return std::make_pair(GPROdd3,
406 GPROdd3 + (sizeof(GPROdd3)/sizeof(unsigned)));
408 return std::make_pair(GPROdd6,
409 GPROdd6 + (sizeof(GPROdd6)/sizeof(unsigned)));
412 return std::make_pair(RC->allocation_order_begin(MF),
413 RC->allocation_order_end(MF));
416 /// ResolveRegAllocHint - Resolves the specified register allocation hint
417 /// to a physical register. Returns the physical register if it is successful.
419 ARMBaseRegisterInfo::ResolveRegAllocHint(unsigned Type, unsigned Reg,
420 const MachineFunction &MF) const {
421 if (Reg == 0 || !isPhysicalRegister(Reg))
425 else if (Type == (unsigned)ARMRI::RegPairOdd)
427 return getRegisterPairOdd(Reg, MF);
428 else if (Type == (unsigned)ARMRI::RegPairEven)
430 return getRegisterPairEven(Reg, MF);
435 ARMBaseRegisterInfo::UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
436 MachineFunction &MF) const {
437 MachineRegisterInfo *MRI = &MF.getRegInfo();
438 std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(Reg);
439 if ((Hint.first == (unsigned)ARMRI::RegPairOdd ||
440 Hint.first == (unsigned)ARMRI::RegPairEven) &&
441 Hint.second && TargetRegisterInfo::isVirtualRegister(Hint.second)) {
442 // If 'Reg' is one of the even / odd register pair and it's now changed
443 // (e.g. coalesced) into a different register. The other register of the
444 // pair allocation hint must be updated to reflect the relationship
446 unsigned OtherReg = Hint.second;
447 Hint = MRI->getRegAllocationHint(OtherReg);
448 if (Hint.second == Reg)
449 // Make sure the pair has not already divorced.
450 MRI->setRegAllocationHint(OtherReg, Hint.first, NewReg);
454 /// hasFP - Return true if the specified function should have a dedicated frame
455 /// pointer register. This is true if the function has variable sized allocas
456 /// or if frame pointer elimination is disabled.
458 bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
459 const MachineFrameInfo *MFI = MF.getFrameInfo();
460 return (NoFramePointerElim ||
461 MFI->hasVarSizedObjects() ||
462 MFI->isFrameAddressTaken());
465 static unsigned estimateStackSize(MachineFunction &MF, MachineFrameInfo *MFI) {
466 const MachineFrameInfo *FFI = MF.getFrameInfo();
468 for (int i = FFI->getObjectIndexBegin(); i != 0; ++i) {
469 int FixedOff = -FFI->getObjectOffset(i);
470 if (FixedOff > Offset) Offset = FixedOff;
472 for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
473 if (FFI->isDeadObjectIndex(i))
475 Offset += FFI->getObjectSize(i);
476 unsigned Align = FFI->getObjectAlignment(i);
477 // Adjust to alignment boundary
478 Offset = (Offset+Align-1)/Align*Align;
480 return (unsigned)Offset;
484 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
485 RegScavenger *RS) const {
486 // This tells PEI to spill the FP as if it is any other callee-save register
487 // to take advantage the eliminateFrameIndex machinery. This also ensures it
488 // is spilled in the order specified by getCalleeSavedRegs() to make it easier
489 // to combine multiple loads / stores.
490 bool CanEliminateFrame = true;
491 bool CS1Spilled = false;
492 bool LRSpilled = false;
493 unsigned NumGPRSpills = 0;
494 SmallVector<unsigned, 4> UnspilledCS1GPRs;
495 SmallVector<unsigned, 4> UnspilledCS2GPRs;
496 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
498 // Don't spill FP if the frame can be eliminated. This is determined
499 // by scanning the callee-save registers to see if any is used.
500 const unsigned *CSRegs = getCalleeSavedRegs();
501 const TargetRegisterClass* const *CSRegClasses = getCalleeSavedRegClasses();
502 for (unsigned i = 0; CSRegs[i]; ++i) {
503 unsigned Reg = CSRegs[i];
504 bool Spilled = false;
505 if (MF.getRegInfo().isPhysRegUsed(Reg)) {
506 AFI->setCSRegisterIsSpilled(Reg);
508 CanEliminateFrame = false;
510 // Check alias registers too.
511 for (const unsigned *Aliases = getAliasSet(Reg); *Aliases; ++Aliases) {
512 if (MF.getRegInfo().isPhysRegUsed(*Aliases)) {
514 CanEliminateFrame = false;
519 if (CSRegClasses[i] == &ARM::GPRRegClass) {
523 if (!STI.isTargetDarwin()) {
530 // Keep track if LR and any of R4, R5, R6, and R7 is spilled.
545 if (!STI.isTargetDarwin()) {
546 UnspilledCS1GPRs.push_back(Reg);
556 UnspilledCS1GPRs.push_back(Reg);
559 UnspilledCS2GPRs.push_back(Reg);
566 bool ForceLRSpill = false;
567 if (!LRSpilled && AFI->isThumbFunction()) {
568 unsigned FnSize = TII.GetFunctionSizeInBytes(MF);
569 // Force LR to be spilled if the Thumb function size is > 2048. This enables
570 // use of BL to implement far jump. If it turns out that it's not needed
571 // then the branch fix up path will undo it.
572 if (FnSize >= (1 << 11)) {
573 CanEliminateFrame = false;
578 bool ExtraCSSpill = false;
579 if (!CanEliminateFrame || hasFP(MF)) {
580 AFI->setHasStackFrame(true);
582 // If LR is not spilled, but at least one of R4, R5, R6, and R7 is spilled.
583 // Spill LR as well so we can fold BX_RET to the registers restore (LDM).
584 if (!LRSpilled && CS1Spilled) {
585 MF.getRegInfo().setPhysRegUsed(ARM::LR);
586 AFI->setCSRegisterIsSpilled(ARM::LR);
588 UnspilledCS1GPRs.erase(std::find(UnspilledCS1GPRs.begin(),
589 UnspilledCS1GPRs.end(), (unsigned)ARM::LR));
590 ForceLRSpill = false;
594 // Darwin ABI requires FP to point to the stack slot that contains the
596 if (STI.isTargetDarwin() || hasFP(MF)) {
597 MF.getRegInfo().setPhysRegUsed(FramePtr);
601 // If stack and double are 8-byte aligned and we are spilling an odd number
602 // of GPRs. Spill one extra callee save GPR so we won't have to pad between
603 // the integer and double callee save areas.
604 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
605 if (TargetAlign == 8 && (NumGPRSpills & 1)) {
606 if (CS1Spilled && !UnspilledCS1GPRs.empty()) {
607 for (unsigned i = 0, e = UnspilledCS1GPRs.size(); i != e; ++i) {
608 unsigned Reg = UnspilledCS1GPRs[i];
609 // Don't spiil high register if the function is thumb
610 if (!AFI->isThumbFunction() ||
611 isARMLowRegister(Reg) || Reg == ARM::LR) {
612 MF.getRegInfo().setPhysRegUsed(Reg);
613 AFI->setCSRegisterIsSpilled(Reg);
614 if (!isReservedReg(MF, Reg))
619 } else if (!UnspilledCS2GPRs.empty() &&
620 !AFI->isThumbFunction()) {
621 unsigned Reg = UnspilledCS2GPRs.front();
622 MF.getRegInfo().setPhysRegUsed(Reg);
623 AFI->setCSRegisterIsSpilled(Reg);
624 if (!isReservedReg(MF, Reg))
629 // Estimate if we might need to scavenge a register at some point in order
630 // to materialize a stack offset. If so, either spill one additional
631 // callee-saved register or reserve a special spill slot to facilitate
632 // register scavenging.
633 if (RS && !ExtraCSSpill && !AFI->isThumbFunction()) {
634 MachineFrameInfo *MFI = MF.getFrameInfo();
635 unsigned Size = estimateStackSize(MF, MFI);
636 unsigned Limit = (1 << 12) - 1;
637 for (MachineFunction::iterator BB = MF.begin(),E = MF.end();BB != E; ++BB)
638 for (MachineBasicBlock::iterator I= BB->begin(); I != BB->end(); ++I) {
639 for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
640 if (I->getOperand(i).isFI()) {
641 unsigned Opcode = I->getOpcode();
642 const TargetInstrDesc &Desc = TII.get(Opcode);
643 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
644 if (AddrMode == ARMII::AddrMode3) {
645 Limit = (1 << 8) - 1;
647 } else if (AddrMode == ARMII::AddrMode5) {
648 unsigned ThisLimit = ((1 << 8) - 1) * 4;
649 if (ThisLimit < Limit)
656 // If any non-reserved CS register isn't spilled, just spill one or two
657 // extra. That should take care of it!
658 unsigned NumExtras = TargetAlign / 4;
659 SmallVector<unsigned, 2> Extras;
660 while (NumExtras && !UnspilledCS1GPRs.empty()) {
661 unsigned Reg = UnspilledCS1GPRs.back();
662 UnspilledCS1GPRs.pop_back();
663 if (!isReservedReg(MF, Reg)) {
664 Extras.push_back(Reg);
668 while (NumExtras && !UnspilledCS2GPRs.empty()) {
669 unsigned Reg = UnspilledCS2GPRs.back();
670 UnspilledCS2GPRs.pop_back();
671 if (!isReservedReg(MF, Reg)) {
672 Extras.push_back(Reg);
676 if (Extras.size() && NumExtras == 0) {
677 for (unsigned i = 0, e = Extras.size(); i != e; ++i) {
678 MF.getRegInfo().setPhysRegUsed(Extras[i]);
679 AFI->setCSRegisterIsSpilled(Extras[i]);
682 // Reserve a slot closest to SP or frame pointer.
683 const TargetRegisterClass *RC = &ARM::GPRRegClass;
684 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
685 RC->getAlignment()));
692 MF.getRegInfo().setPhysRegUsed(ARM::LR);
693 AFI->setCSRegisterIsSpilled(ARM::LR);
694 AFI->setLRIsSpilledForFarJump(true);
698 unsigned ARMBaseRegisterInfo::getRARegister() const {
702 unsigned ARMBaseRegisterInfo::getFrameRegister(MachineFunction &MF) const {
703 if (STI.isTargetDarwin() || hasFP(MF))
708 unsigned ARMBaseRegisterInfo::getEHExceptionRegister() const {
709 assert(0 && "What is the exception register");
713 unsigned ARMBaseRegisterInfo::getEHHandlerRegister() const {
714 assert(0 && "What is the exception handler register");
718 int ARMBaseRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
719 return ARMGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
722 unsigned ARMBaseRegisterInfo::getRegisterPairEven(unsigned Reg,
723 const MachineFunction &MF) const {
726 // Return 0 if either register of the pair is a special register.
732 return STI.isThumb() ? 0 : ARM::R2;
736 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R6;
738 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R8;
740 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R10;
796 unsigned ARMBaseRegisterInfo::getRegisterPairOdd(unsigned Reg,
797 const MachineFunction &MF) const {
800 // Return 0 if either register of the pair is a special register.
806 return STI.isThumb() ? 0 : ARM::R3;
810 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R7;
812 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R9;
814 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R11;
872 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
873 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
877 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
878 return MIB.addReg(0);
881 /// emitLoadConstPool - Emits a load from constpool to materialize the
882 /// specified immediate.
883 void ARMBaseRegisterInfo::
884 emitLoadConstPool(MachineBasicBlock &MBB,
885 MachineBasicBlock::iterator &MBBI,
887 unsigned DestReg, int Val,
888 ARMCC::CondCodes Pred,
889 unsigned PredReg) const {
890 MachineFunction &MF = *MBB.getParent();
891 MachineConstantPool *ConstantPool = MF.getConstantPool();
892 Constant *C = ConstantInt::get(Type::Int32Ty, Val);
893 unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
895 BuildMI(MBB, MBBI, dl, TII.get(ARM::LDRcp), DestReg)
896 .addConstantPoolIndex(Idx)
897 .addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
900 bool ARMBaseRegisterInfo::
901 requiresRegisterScavenging(const MachineFunction &MF) const {
905 // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
906 // not required, we reserve argument space for call sites in the function
907 // immediately on entry to the current function. This eliminates the need for
908 // add/sub sp brackets around call sites. Returns true if the call frame is
909 // included as part of the stack frame.
910 bool ARMBaseRegisterInfo::
911 hasReservedCallFrame(MachineFunction &MF) const {
912 const MachineFrameInfo *FFI = MF.getFrameInfo();
913 unsigned CFSize = FFI->getMaxCallFrameSize();
914 // It's not always a good idea to include the call frame as part of the
915 // stack frame. ARM (especially Thumb) has small immediate offset to
916 // address the stack frame. So a large call frame can cause poor codegen
917 // and may even makes it impossible to scavenge a register.
918 if (CFSize >= ((1 << 12) - 1) / 2) // Half of imm12
921 return !MF.getFrameInfo()->hasVarSizedObjects();
924 /// emitARMRegPlusImmediate - Emits a series of instructions to materialize
925 /// a destreg = basereg + immediate in ARM code.
927 void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
928 MachineBasicBlock::iterator &MBBI,
929 unsigned DestReg, unsigned BaseReg, int NumBytes,
930 ARMCC::CondCodes Pred, unsigned PredReg,
931 const ARMBaseInstrInfo &TII,
933 bool isSub = NumBytes < 0;
934 if (isSub) NumBytes = -NumBytes;
937 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
938 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
939 assert(ThisVal && "Didn't extract field correctly");
941 // We will handle these bits from offset, clear them.
942 NumBytes &= ~ThisVal;
944 // Get the properly encoded SOImmVal field.
945 int SOImmVal = ARM_AM::getSOImmVal(ThisVal);
946 assert(SOImmVal != -1 && "Bit extraction didn't work?");
948 // Build the new ADD / SUB.
949 BuildMI(MBB, MBBI, dl, TII.get(TII.getOpcode(isSub ? ARMII::SUBri : ARMII::ADDri)), DestReg)
950 .addReg(BaseReg, RegState::Kill).addImm(SOImmVal)
951 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
957 emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
958 const ARMBaseInstrInfo &TII, DebugLoc dl,
960 ARMCC::CondCodes Pred = ARMCC::AL, unsigned PredReg = 0) {
961 emitARMRegPlusImmediate(MBB, MBBI, ARM::SP, ARM::SP, NumBytes,
962 Pred, PredReg, TII, dl);
965 void ARMBaseRegisterInfo::
966 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
967 MachineBasicBlock::iterator I) const {
968 if (!hasReservedCallFrame(MF)) {
969 // If we have alloca, convert as follows:
970 // ADJCALLSTACKDOWN -> sub, sp, sp, amount
971 // ADJCALLSTACKUP -> add, sp, sp, amount
972 MachineInstr *Old = I;
973 DebugLoc dl = Old->getDebugLoc();
974 unsigned Amount = Old->getOperand(0).getImm();
976 // We need to keep the stack aligned properly. To do this, we round the
977 // amount of space needed for the outgoing arguments up to the next
978 // alignment boundary.
979 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
980 Amount = (Amount+Align-1)/Align*Align;
982 // Replace the pseudo instruction with a new instruction...
983 unsigned Opc = Old->getOpcode();
984 ARMCC::CondCodes Pred = (ARMCC::CondCodes)Old->getOperand(1).getImm();
985 if (Opc == ARM::ADJCALLSTACKDOWN || Opc == ARM::tADJCALLSTACKDOWN) {
986 // Note: PredReg is operand 2 for ADJCALLSTACKDOWN.
987 unsigned PredReg = Old->getOperand(2).getReg();
988 emitSPUpdate(MBB, I, TII, dl, -Amount, Pred, PredReg);
990 // Note: PredReg is operand 3 for ADJCALLSTACKUP.
991 unsigned PredReg = Old->getOperand(3).getReg();
992 assert(Opc == ARM::ADJCALLSTACKUP || Opc == ARM::tADJCALLSTACKUP);
993 emitSPUpdate(MBB, I, TII, dl, Amount, Pred, PredReg);
1000 /// findScratchRegister - Find a 'free' ARM register. If register scavenger
1001 /// is not being used, R12 is available. Otherwise, try for a call-clobbered
1002 /// register first and then a spilled callee-saved register if that fails.
1004 unsigned findScratchRegister(RegScavenger *RS, const TargetRegisterClass *RC,
1005 ARMFunctionInfo *AFI) {
1006 unsigned Reg = RS ? RS->FindUnusedReg(RC, true) : (unsigned) ARM::R12;
1007 assert (!AFI->isThumbFunction());
1009 // Try a already spilled CS register.
1010 Reg = RS->FindUnusedReg(RC, AFI->getSpilledCSRegisters());
1015 void ARMBaseRegisterInfo::
1016 eliminateFrameIndex(MachineBasicBlock::iterator II,
1017 int SPAdj, RegScavenger *RS) const{
1019 MachineInstr &MI = *II;
1020 MachineBasicBlock &MBB = *MI.getParent();
1021 MachineFunction &MF = *MBB.getParent();
1022 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1023 DebugLoc dl = MI.getDebugLoc();
1025 while (!MI.getOperand(i).isFI()) {
1027 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
1030 unsigned FrameReg = ARM::SP;
1031 int FrameIndex = MI.getOperand(i).getIndex();
1032 int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
1033 MF.getFrameInfo()->getStackSize() + SPAdj;
1035 if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
1036 Offset -= AFI->getGPRCalleeSavedArea1Offset();
1037 else if (AFI->isGPRCalleeSavedArea2Frame(FrameIndex))
1038 Offset -= AFI->getGPRCalleeSavedArea2Offset();
1039 else if (AFI->isDPRCalleeSavedAreaFrame(FrameIndex))
1040 Offset -= AFI->getDPRCalleeSavedAreaOffset();
1041 else if (hasFP(MF)) {
1042 assert(SPAdj == 0 && "Unexpected");
1043 // There is alloca()'s in this function, must reference off the frame
1045 FrameReg = getFrameRegister(MF);
1046 Offset -= AFI->getFramePtrSpillOffset();
1049 unsigned Opcode = MI.getOpcode();
1050 const TargetInstrDesc &Desc = MI.getDesc();
1051 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
1054 // Memory operands in inline assembly always use AddrMode2.
1055 if (Opcode == ARM::INLINEASM)
1056 AddrMode = ARMII::AddrMode2;
1058 if (Opcode == getOpcode(ARMII::ADDri)) {
1059 Offset += MI.getOperand(i+1).getImm();
1061 // Turn it into a move.
1062 MI.setDesc(TII.get(getOpcode(ARMII::MOVr)));
1063 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1064 MI.RemoveOperand(i+1);
1066 } else if (Offset < 0) {
1069 MI.setDesc(TII.get(getOpcode(ARMII::SUBri)));
1072 // Common case: small offset, fits into instruction.
1073 int ImmedOffset = ARM_AM::getSOImmVal(Offset);
1074 if (ImmedOffset != -1) {
1075 // Replace the FrameIndex with sp / fp
1076 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1077 MI.getOperand(i+1).ChangeToImmediate(ImmedOffset);
1081 // Otherwise, we fallback to common code below to form the imm offset with
1082 // a sequence of ADDri instructions. First though, pull as much of the imm
1083 // into this ADDri as possible.
1084 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
1085 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
1087 // We will handle these bits from offset, clear them.
1088 Offset &= ~ThisImmVal;
1090 // Get the properly encoded SOImmVal field.
1091 int ThisSOImmVal = ARM_AM::getSOImmVal(ThisImmVal);
1092 assert(ThisSOImmVal != -1 && "Bit extraction didn't work?");
1093 MI.getOperand(i+1).ChangeToImmediate(ThisSOImmVal);
1095 unsigned ImmIdx = 0;
1097 unsigned NumBits = 0;
1100 case ARMII::AddrMode2: {
1102 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
1103 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1108 case ARMII::AddrMode3: {
1110 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
1111 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1116 case ARMII::AddrMode5: {
1118 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
1119 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1126 LLVM_UNREACHABLE("Unsupported addressing mode!");
1130 Offset += InstrOffs * Scale;
1131 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
1137 // Common case: small offset, fits into instruction.
1138 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
1139 int ImmedOffset = Offset / Scale;
1140 unsigned Mask = (1 << NumBits) - 1;
1141 if ((unsigned)Offset <= Mask * Scale) {
1142 // Replace the FrameIndex with sp
1143 MI.getOperand(i).ChangeToRegister(FrameReg, false);
1145 ImmedOffset |= 1 << NumBits;
1146 ImmOp.ChangeToImmediate(ImmedOffset);
1150 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
1151 ImmedOffset = ImmedOffset & Mask;
1153 ImmedOffset |= 1 << NumBits;
1154 ImmOp.ChangeToImmediate(ImmedOffset);
1155 Offset &= ~(Mask*Scale);
1158 // If we get here, the immediate doesn't fit into the instruction. We folded
1159 // as much as possible above, handle the rest, providing a register that is
1161 assert(Offset && "This code isn't needed if offset already handled!");
1163 // Insert a set of r12 with the full address: r12 = sp + offset
1164 // If the offset we have is too large to fit into the instruction, we need
1165 // to form it with a series of ADDri's. Do this by taking 8-bit chunks
1167 unsigned ScratchReg = findScratchRegister(RS, &ARM::GPRRegClass, AFI);
1168 if (ScratchReg == 0)
1169 // No register is "free". Scavenge a register.
1170 ScratchReg = RS->scavengeRegister(&ARM::GPRRegClass, II, SPAdj);
1171 int PIdx = MI.findFirstPredOperandIdx();
1172 ARMCC::CondCodes Pred = (PIdx == -1)
1173 ? ARMCC::AL : (ARMCC::CondCodes)MI.getOperand(PIdx).getImm();
1174 unsigned PredReg = (PIdx == -1) ? 0 : MI.getOperand(PIdx+1).getReg();
1175 emitARMRegPlusImmediate(MBB, II, ScratchReg, FrameReg,
1176 isSub ? -Offset : Offset, Pred, PredReg, TII, dl);
1177 MI.getOperand(i).ChangeToRegister(ScratchReg, false, false, true);
1180 /// Move iterator pass the next bunch of callee save load / store ops for
1181 /// the particular spill area (1: integer area 1, 2: integer area 2,
1182 /// 3: fp area, 0: don't care).
1183 static void movePastCSLoadStoreOps(MachineBasicBlock &MBB,
1184 MachineBasicBlock::iterator &MBBI,
1185 int Opc, unsigned Area,
1186 const ARMSubtarget &STI) {
1187 while (MBBI != MBB.end() &&
1188 MBBI->getOpcode() == Opc && MBBI->getOperand(1).isFI()) {
1191 unsigned Category = 0;
1192 switch (MBBI->getOperand(0).getReg()) {
1193 case ARM::R4: case ARM::R5: case ARM::R6: case ARM::R7:
1197 case ARM::R8: case ARM::R9: case ARM::R10: case ARM::R11:
1198 Category = STI.isTargetDarwin() ? 2 : 1;
1200 case ARM::D8: case ARM::D9: case ARM::D10: case ARM::D11:
1201 case ARM::D12: case ARM::D13: case ARM::D14: case ARM::D15:
1208 if (Done || Category != Area)
1216 void ARMBaseRegisterInfo::
1217 emitPrologue(MachineFunction &MF) const {
1218 MachineBasicBlock &MBB = MF.front();
1219 MachineBasicBlock::iterator MBBI = MBB.begin();
1220 MachineFrameInfo *MFI = MF.getFrameInfo();
1221 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1222 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1223 unsigned NumBytes = MFI->getStackSize();
1224 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1225 DebugLoc dl = (MBBI != MBB.end() ?
1226 MBBI->getDebugLoc() : DebugLoc::getUnknownLoc());
1228 // Determine the sizes of each callee-save spill areas and record which frame
1229 // belongs to which callee-save spill areas.
1230 unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
1231 int FramePtrSpillFI = 0;
1234 emitSPUpdate(MBB, MBBI, TII, dl, -VARegSaveSize);
1236 if (!AFI->hasStackFrame()) {
1238 emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
1242 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1243 unsigned Reg = CSI[i].getReg();
1244 int FI = CSI[i].getFrameIdx();
1251 if (Reg == FramePtr)
1252 FramePtrSpillFI = FI;
1253 AFI->addGPRCalleeSavedArea1Frame(FI);
1260 if (Reg == FramePtr)
1261 FramePtrSpillFI = FI;
1262 if (STI.isTargetDarwin()) {
1263 AFI->addGPRCalleeSavedArea2Frame(FI);
1266 AFI->addGPRCalleeSavedArea1Frame(FI);
1271 AFI->addDPRCalleeSavedAreaFrame(FI);
1276 // Build the new SUBri to adjust SP for integer callee-save spill area 1.
1277 emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS1Size);
1278 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::STR), 1, STI);
1280 // Darwin ABI requires FP to point to the stack slot that contains the
1282 if (STI.isTargetDarwin() || hasFP(MF)) {
1283 MachineInstrBuilder MIB =
1284 BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::ADDri)), FramePtr)
1285 .addFrameIndex(FramePtrSpillFI).addImm(0);
1286 AddDefaultCC(AddDefaultPred(MIB));
1289 // Build the new SUBri to adjust SP for integer callee-save spill area 2.
1290 emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS2Size);
1292 // Build the new SUBri to adjust SP for FP callee-save spill area.
1293 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::STR), 2, STI);
1294 emitSPUpdate(MBB, MBBI, TII, dl, -DPRCSSize);
1296 // Determine starting offsets of spill areas.
1297 unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
1298 unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
1299 unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
1300 AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
1301 AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
1302 AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
1303 AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
1305 NumBytes = DPRCSOffset;
1307 // Insert it after all the callee-save spills.
1308 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::FSTD), 3, STI);
1309 emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
1312 if (STI.isTargetELF() && hasFP(MF)) {
1313 MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
1314 AFI->getFramePtrSpillOffset());
1317 AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
1318 AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
1319 AFI->setDPRCalleeSavedAreaSize(DPRCSSize);
1322 static bool isCalleeSavedRegister(unsigned Reg, const unsigned *CSRegs) {
1323 for (unsigned i = 0; CSRegs[i]; ++i)
1324 if (Reg == CSRegs[i])
1329 static bool isCSRestore(MachineInstr *MI,
1330 const ARMBaseInstrInfo &TII,
1331 const unsigned *CSRegs) {
1332 return ((MI->getOpcode() == (int)TII.getOpcode(ARMII::FLDD) ||
1333 MI->getOpcode() == (int)TII.getOpcode(ARMII::LDR)) &&
1334 MI->getOperand(1).isFI() &&
1335 isCalleeSavedRegister(MI->getOperand(0).getReg(), CSRegs));
1338 void ARMBaseRegisterInfo::
1339 emitEpilogue(MachineFunction &MF,
1340 MachineBasicBlock &MBB) const {
1341 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1342 assert(MBBI->getOpcode() == (int)getOpcode(ARMII::BX_RET) &&
1343 "Can only insert epilog into returning blocks");
1344 DebugLoc dl = MBBI->getDebugLoc();
1345 MachineFrameInfo *MFI = MF.getFrameInfo();
1346 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1347 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1348 int NumBytes = (int)MFI->getStackSize();
1350 if (!AFI->hasStackFrame()) {
1352 emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
1354 // Unwind MBBI to point to first LDR / FLDD.
1355 const unsigned *CSRegs = getCalleeSavedRegs();
1356 if (MBBI != MBB.begin()) {
1359 while (MBBI != MBB.begin() && isCSRestore(MBBI, TII, CSRegs));
1360 if (!isCSRestore(MBBI, TII, CSRegs))
1364 // Move SP to start of FP callee save spill area.
1365 NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
1366 AFI->getGPRCalleeSavedArea2Size() +
1367 AFI->getDPRCalleeSavedAreaSize());
1369 // Darwin ABI requires FP to point to the stack slot that contains the
1371 if ((STI.isTargetDarwin() && NumBytes) || hasFP(MF)) {
1372 NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
1373 // Reset SP based on frame pointer only if the stack frame extends beyond
1374 // frame pointer stack slot or target is ELF and the function has FP.
1375 if (AFI->getGPRCalleeSavedArea2Size() ||
1376 AFI->getDPRCalleeSavedAreaSize() ||
1377 AFI->getDPRCalleeSavedAreaOffset()||
1380 BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::SUBri)), ARM::SP).addReg(FramePtr)
1382 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1384 BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::MOVr)), ARM::SP).addReg(FramePtr)
1385 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1387 } else if (NumBytes) {
1388 emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
1391 // Move SP to start of integer callee save spill area 2.
1392 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::FLDD), 3, STI);
1393 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getDPRCalleeSavedAreaSize());
1395 // Move SP to start of integer callee save spill area 1.
1396 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::LDR), 2, STI);
1397 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea2Size());
1399 // Move SP to SP upon entry to the function.
1400 movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::LDR), 1, STI);
1401 emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea1Size());
1405 emitSPUpdate(MBB, MBBI, TII, dl, VARegSaveSize);
1409 #include "ARMGenRegisterInfo.inc"