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 "ARMBaseRegisterInfo.h"
17 #include "ARMInstrInfo.h"
18 #include "ARMMachineFunctionInfo.h"
19 #include "ARMSubtarget.h"
20 #include "llvm/Constants.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/CodeGen/MachineConstantPool.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineLocation.h"
27 #include "llvm/CodeGen/MachineRegisterInfo.h"
28 #include "llvm/CodeGen/RegisterScavenging.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Target/TargetFrameInfo.h"
31 #include "llvm/Target/TargetMachine.h"
32 #include "llvm/Target/TargetOptions.h"
33 #include "llvm/ADT/BitVector.h"
34 #include "llvm/ADT/SmallVector.h"
37 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
40 case R0: case S0: case D0: return 0;
41 case R1: case S1: case D1: return 1;
42 case R2: case S2: case D2: return 2;
43 case R3: case S3: case D3: return 3;
44 case R4: case S4: case D4: return 4;
45 case R5: case S5: case D5: return 5;
46 case R6: case S6: case D6: return 6;
47 case R7: case S7: case D7: return 7;
48 case R8: case S8: case D8: return 8;
49 case R9: case S9: case D9: return 9;
50 case R10: case S10: case D10: return 10;
51 case R11: case S11: case D11: return 11;
52 case R12: case S12: case D12: return 12;
53 case SP: case S13: case D13: return 13;
54 case LR: case S14: case D14: return 14;
55 case PC: case S15: case D15: return 15;
73 LLVM_UNREACHABLE("Unknown ARM register!");
77 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum,
84 LLVM_UNREACHABLE("Unknown ARM register!");
85 case R0: case D0: return 0;
86 case R1: case D1: return 1;
87 case R2: case D2: return 2;
88 case R3: case D3: return 3;
89 case R4: case D4: return 4;
90 case R5: case D5: return 5;
91 case R6: case D6: return 6;
92 case R7: case D7: return 7;
93 case R8: case D8: return 8;
94 case R9: case D9: return 9;
95 case R10: case D10: return 10;
96 case R11: case D11: return 11;
97 case R12: case D12: return 12;
98 case SP: case D13: return 13;
99 case LR: case D14: return 14;
100 case PC: case D15: return 15;
102 case S0: case S1: case S2: case S3:
103 case S4: case S5: case S6: case S7:
104 case S8: case S9: case S10: case S11:
105 case S12: case S13: case S14: case S15:
106 case S16: case S17: case S18: case S19:
107 case S20: case S21: case S22: case S23:
108 case S24: case S25: case S26: case S27:
109 case S28: case S29: case S30: case S31: {
112 default: return 0; // Avoid compile time warning.
150 ARMBaseRegisterInfo::ARMBaseRegisterInfo(const TargetInstrInfo &tii,
151 const ARMSubtarget &sti)
152 : ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
154 FramePtr((STI.isTargetDarwin() || STI.isThumb()) ? ARM::R7 : ARM::R11) {
158 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
159 static const unsigned CalleeSavedRegs[] = {
160 ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
161 ARM::R7, ARM::R6, ARM::R5, ARM::R4,
163 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
164 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
168 static const unsigned DarwinCalleeSavedRegs[] = {
169 // Darwin ABI deviates from ARM standard ABI. R9 is not a callee-saved
171 ARM::LR, ARM::R7, ARM::R6, ARM::R5, ARM::R4,
172 ARM::R11, ARM::R10, ARM::R8,
174 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
175 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
178 return STI.isTargetDarwin() ? DarwinCalleeSavedRegs : CalleeSavedRegs;
181 const TargetRegisterClass* const *
182 ARMBaseRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
183 static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
184 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
185 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
186 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
188 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
189 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
193 static const TargetRegisterClass * const ThumbCalleeSavedRegClasses[] = {
194 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
195 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::tGPRRegClass,
196 &ARM::tGPRRegClass,&ARM::tGPRRegClass,&ARM::tGPRRegClass,
198 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
199 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
203 static const TargetRegisterClass * const DarwinCalleeSavedRegClasses[] = {
204 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
205 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
206 &ARM::GPRRegClass, &ARM::GPRRegClass,
208 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
209 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
213 static const TargetRegisterClass * const DarwinThumbCalleeSavedRegClasses[] ={
214 &ARM::GPRRegClass, &ARM::tGPRRegClass, &ARM::tGPRRegClass,
215 &ARM::tGPRRegClass, &ARM::tGPRRegClass, &ARM::GPRRegClass,
216 &ARM::GPRRegClass, &ARM::GPRRegClass,
218 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
219 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
224 return STI.isTargetDarwin()
225 ? DarwinThumbCalleeSavedRegClasses : ThumbCalleeSavedRegClasses;
227 return STI.isTargetDarwin()
228 ? DarwinCalleeSavedRegClasses : CalleeSavedRegClasses;
231 BitVector ARMBaseRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
232 // FIXME: avoid re-calculating this everytime.
233 BitVector Reserved(getNumRegs());
234 Reserved.set(ARM::SP);
235 Reserved.set(ARM::PC);
236 if (STI.isTargetDarwin() || hasFP(MF))
237 Reserved.set(FramePtr);
238 // Some targets reserve R9.
239 if (STI.isR9Reserved())
240 Reserved.set(ARM::R9);
245 ARMBaseRegisterInfo::isReservedReg(const MachineFunction &MF, unsigned Reg) const {
253 if (FramePtr == Reg && (STI.isTargetDarwin() || hasFP(MF)))
257 return STI.isR9Reserved();
263 const TargetRegisterClass *ARMBaseRegisterInfo::getPointerRegClass() const {
264 return &ARM::GPRRegClass;
267 /// getAllocationOrder - Returns the register allocation order for a specified
268 /// register class in the form of a pair of TargetRegisterClass iterators.
269 std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator>
270 ARMBaseRegisterInfo::getAllocationOrder(const TargetRegisterClass *RC,
271 unsigned HintType, unsigned HintReg,
272 const MachineFunction &MF) const {
273 // Alternative register allocation orders when favoring even / odd registers
274 // of register pairs.
276 // No FP, R9 is available.
277 static const unsigned GPREven1[] = {
278 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8, ARM::R10,
279 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7,
282 static const unsigned GPROdd1[] = {
283 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R9, ARM::R11,
284 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
288 // FP is R7, R9 is available.
289 static const unsigned GPREven2[] = {
290 ARM::R0, ARM::R2, ARM::R4, ARM::R8, ARM::R10,
291 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6,
294 static const unsigned GPROdd2[] = {
295 ARM::R1, ARM::R3, ARM::R5, ARM::R9, ARM::R11,
296 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
300 // FP is R11, R9 is available.
301 static const unsigned GPREven3[] = {
302 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8,
303 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7,
306 static const unsigned GPROdd3[] = {
307 ARM::R1, ARM::R3, ARM::R5, ARM::R6, ARM::R9,
308 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R7,
312 // No FP, R9 is not available.
313 static const unsigned GPREven4[] = {
314 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R10,
315 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8,
318 static const unsigned GPROdd4[] = {
319 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R11,
320 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
324 // FP is R7, R9 is not available.
325 static const unsigned GPREven5[] = {
326 ARM::R0, ARM::R2, ARM::R4, ARM::R10,
327 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6, ARM::R8,
330 static const unsigned GPROdd5[] = {
331 ARM::R1, ARM::R3, ARM::R5, ARM::R11,
332 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
336 // FP is R11, R9 is not available.
337 static const unsigned GPREven6[] = {
338 ARM::R0, ARM::R2, ARM::R4, ARM::R6,
339 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8
341 static const unsigned GPROdd6[] = {
342 ARM::R1, ARM::R3, ARM::R5, ARM::R7,
343 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8
347 if (HintType == ARMRI::RegPairEven) {
348 if (isPhysicalRegister(HintReg) && getRegisterPairEven(HintReg, MF) == 0)
349 // It's no longer possible to fulfill this hint. Return the default
351 return std::make_pair(RC->allocation_order_begin(MF),
352 RC->allocation_order_end(MF));
354 if (!STI.isTargetDarwin() && !hasFP(MF)) {
355 if (!STI.isR9Reserved())
356 return std::make_pair(GPREven1,
357 GPREven1 + (sizeof(GPREven1)/sizeof(unsigned)));
359 return std::make_pair(GPREven4,
360 GPREven4 + (sizeof(GPREven4)/sizeof(unsigned)));
361 } else if (FramePtr == ARM::R7) {
362 if (!STI.isR9Reserved())
363 return std::make_pair(GPREven2,
364 GPREven2 + (sizeof(GPREven2)/sizeof(unsigned)));
366 return std::make_pair(GPREven5,
367 GPREven5 + (sizeof(GPREven5)/sizeof(unsigned)));
368 } else { // FramePtr == ARM::R11
369 if (!STI.isR9Reserved())
370 return std::make_pair(GPREven3,
371 GPREven3 + (sizeof(GPREven3)/sizeof(unsigned)));
373 return std::make_pair(GPREven6,
374 GPREven6 + (sizeof(GPREven6)/sizeof(unsigned)));
376 } else if (HintType == ARMRI::RegPairOdd) {
377 if (isPhysicalRegister(HintReg) && getRegisterPairOdd(HintReg, MF) == 0)
378 // It's no longer possible to fulfill this hint. Return the default
380 return std::make_pair(RC->allocation_order_begin(MF),
381 RC->allocation_order_end(MF));
383 if (!STI.isTargetDarwin() && !hasFP(MF)) {
384 if (!STI.isR9Reserved())
385 return std::make_pair(GPROdd1,
386 GPROdd1 + (sizeof(GPROdd1)/sizeof(unsigned)));
388 return std::make_pair(GPROdd4,
389 GPROdd4 + (sizeof(GPROdd4)/sizeof(unsigned)));
390 } else if (FramePtr == ARM::R7) {
391 if (!STI.isR9Reserved())
392 return std::make_pair(GPROdd2,
393 GPROdd2 + (sizeof(GPROdd2)/sizeof(unsigned)));
395 return std::make_pair(GPROdd5,
396 GPROdd5 + (sizeof(GPROdd5)/sizeof(unsigned)));
397 } else { // FramePtr == ARM::R11
398 if (!STI.isR9Reserved())
399 return std::make_pair(GPROdd3,
400 GPROdd3 + (sizeof(GPROdd3)/sizeof(unsigned)));
402 return std::make_pair(GPROdd6,
403 GPROdd6 + (sizeof(GPROdd6)/sizeof(unsigned)));
406 return std::make_pair(RC->allocation_order_begin(MF),
407 RC->allocation_order_end(MF));
410 /// ResolveRegAllocHint - Resolves the specified register allocation hint
411 /// to a physical register. Returns the physical register if it is successful.
413 ARMBaseRegisterInfo::ResolveRegAllocHint(unsigned Type, unsigned Reg,
414 const MachineFunction &MF) const {
415 if (Reg == 0 || !isPhysicalRegister(Reg))
419 else if (Type == (unsigned)ARMRI::RegPairOdd)
421 return getRegisterPairOdd(Reg, MF);
422 else if (Type == (unsigned)ARMRI::RegPairEven)
424 return getRegisterPairEven(Reg, MF);
429 ARMBaseRegisterInfo::UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
430 MachineFunction &MF) const {
431 MachineRegisterInfo *MRI = &MF.getRegInfo();
432 std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(Reg);
433 if ((Hint.first == (unsigned)ARMRI::RegPairOdd ||
434 Hint.first == (unsigned)ARMRI::RegPairEven) &&
435 Hint.second && TargetRegisterInfo::isVirtualRegister(Hint.second)) {
436 // If 'Reg' is one of the even / odd register pair and it's now changed
437 // (e.g. coalesced) into a different register. The other register of the
438 // pair allocation hint must be updated to reflect the relationship
440 unsigned OtherReg = Hint.second;
441 Hint = MRI->getRegAllocationHint(OtherReg);
442 if (Hint.second == Reg)
443 // Make sure the pair has not already divorced.
444 MRI->setRegAllocationHint(OtherReg, Hint.first, NewReg);
448 /// hasFP - Return true if the specified function should have a dedicated frame
449 /// pointer register. This is true if the function has variable sized allocas
450 /// or if frame pointer elimination is disabled.
452 bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
453 const MachineFrameInfo *MFI = MF.getFrameInfo();
454 return (NoFramePointerElim ||
455 MFI->hasVarSizedObjects() ||
456 MFI->isFrameAddressTaken());
459 static unsigned estimateStackSize(MachineFunction &MF, MachineFrameInfo *MFI) {
460 const MachineFrameInfo *FFI = MF.getFrameInfo();
462 for (int i = FFI->getObjectIndexBegin(); i != 0; ++i) {
463 int FixedOff = -FFI->getObjectOffset(i);
464 if (FixedOff > Offset) Offset = FixedOff;
466 for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
467 if (FFI->isDeadObjectIndex(i))
469 Offset += FFI->getObjectSize(i);
470 unsigned Align = FFI->getObjectAlignment(i);
471 // Adjust to alignment boundary
472 Offset = (Offset+Align-1)/Align*Align;
474 return (unsigned)Offset;
478 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
479 RegScavenger *RS) const {
480 // This tells PEI to spill the FP as if it is any other callee-save register
481 // to take advantage the eliminateFrameIndex machinery. This also ensures it
482 // is spilled in the order specified by getCalleeSavedRegs() to make it easier
483 // to combine multiple loads / stores.
484 bool CanEliminateFrame = true;
485 bool CS1Spilled = false;
486 bool LRSpilled = false;
487 unsigned NumGPRSpills = 0;
488 SmallVector<unsigned, 4> UnspilledCS1GPRs;
489 SmallVector<unsigned, 4> UnspilledCS2GPRs;
490 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
492 // Don't spill FP if the frame can be eliminated. This is determined
493 // by scanning the callee-save registers to see if any is used.
494 const unsigned *CSRegs = getCalleeSavedRegs();
495 const TargetRegisterClass* const *CSRegClasses = getCalleeSavedRegClasses();
496 for (unsigned i = 0; CSRegs[i]; ++i) {
497 unsigned Reg = CSRegs[i];
498 bool Spilled = false;
499 if (MF.getRegInfo().isPhysRegUsed(Reg)) {
500 AFI->setCSRegisterIsSpilled(Reg);
502 CanEliminateFrame = false;
504 // Check alias registers too.
505 for (const unsigned *Aliases = getAliasSet(Reg); *Aliases; ++Aliases) {
506 if (MF.getRegInfo().isPhysRegUsed(*Aliases)) {
508 CanEliminateFrame = false;
513 if (CSRegClasses[i] == &ARM::GPRRegClass) {
517 if (!STI.isTargetDarwin()) {
524 // Keep track if LR and any of R4, R5, R6, and R7 is spilled.
539 if (!STI.isTargetDarwin()) {
540 UnspilledCS1GPRs.push_back(Reg);
550 UnspilledCS1GPRs.push_back(Reg);
553 UnspilledCS2GPRs.push_back(Reg);
560 bool ForceLRSpill = false;
561 if (!LRSpilled && AFI->isThumbFunction()) {
562 unsigned FnSize = TII.GetFunctionSizeInBytes(MF);
563 // Force LR to be spilled if the Thumb function size is > 2048. This enables
564 // use of BL to implement far jump. If it turns out that it's not needed
565 // then the branch fix up path will undo it.
566 if (FnSize >= (1 << 11)) {
567 CanEliminateFrame = false;
572 bool ExtraCSSpill = false;
573 if (!CanEliminateFrame || hasFP(MF)) {
574 AFI->setHasStackFrame(true);
576 // If LR is not spilled, but at least one of R4, R5, R6, and R7 is spilled.
577 // Spill LR as well so we can fold BX_RET to the registers restore (LDM).
578 if (!LRSpilled && CS1Spilled) {
579 MF.getRegInfo().setPhysRegUsed(ARM::LR);
580 AFI->setCSRegisterIsSpilled(ARM::LR);
582 UnspilledCS1GPRs.erase(std::find(UnspilledCS1GPRs.begin(),
583 UnspilledCS1GPRs.end(), (unsigned)ARM::LR));
584 ForceLRSpill = false;
588 // Darwin ABI requires FP to point to the stack slot that contains the
590 if (STI.isTargetDarwin() || hasFP(MF)) {
591 MF.getRegInfo().setPhysRegUsed(FramePtr);
595 // If stack and double are 8-byte aligned and we are spilling an odd number
596 // of GPRs. Spill one extra callee save GPR so we won't have to pad between
597 // the integer and double callee save areas.
598 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
599 if (TargetAlign == 8 && (NumGPRSpills & 1)) {
600 if (CS1Spilled && !UnspilledCS1GPRs.empty()) {
601 for (unsigned i = 0, e = UnspilledCS1GPRs.size(); i != e; ++i) {
602 unsigned Reg = UnspilledCS1GPRs[i];
603 // Don't spiil high register if the function is thumb
604 if (!AFI->isThumbFunction() ||
605 isARMLowRegister(Reg) || Reg == ARM::LR) {
606 MF.getRegInfo().setPhysRegUsed(Reg);
607 AFI->setCSRegisterIsSpilled(Reg);
608 if (!isReservedReg(MF, Reg))
613 } else if (!UnspilledCS2GPRs.empty() &&
614 !AFI->isThumbFunction()) {
615 unsigned Reg = UnspilledCS2GPRs.front();
616 MF.getRegInfo().setPhysRegUsed(Reg);
617 AFI->setCSRegisterIsSpilled(Reg);
618 if (!isReservedReg(MF, Reg))
623 // Estimate if we might need to scavenge a register at some point in order
624 // to materialize a stack offset. If so, either spill one additional
625 // callee-saved register or reserve a special spill slot to facilitate
626 // register scavenging.
627 if (RS && !ExtraCSSpill && !AFI->isThumbFunction()) {
628 MachineFrameInfo *MFI = MF.getFrameInfo();
629 unsigned Size = estimateStackSize(MF, MFI);
630 unsigned Limit = (1 << 12) - 1;
631 for (MachineFunction::iterator BB = MF.begin(),E = MF.end();BB != E; ++BB)
632 for (MachineBasicBlock::iterator I= BB->begin(); I != BB->end(); ++I) {
633 for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
634 if (I->getOperand(i).isFI()) {
635 unsigned Opcode = I->getOpcode();
636 const TargetInstrDesc &Desc = TII.get(Opcode);
637 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
638 if (AddrMode == ARMII::AddrMode3) {
639 Limit = (1 << 8) - 1;
641 } else if (AddrMode == ARMII::AddrMode5) {
642 unsigned ThisLimit = ((1 << 8) - 1) * 4;
643 if (ThisLimit < Limit)
650 // If any non-reserved CS register isn't spilled, just spill one or two
651 // extra. That should take care of it!
652 unsigned NumExtras = TargetAlign / 4;
653 SmallVector<unsigned, 2> Extras;
654 while (NumExtras && !UnspilledCS1GPRs.empty()) {
655 unsigned Reg = UnspilledCS1GPRs.back();
656 UnspilledCS1GPRs.pop_back();
657 if (!isReservedReg(MF, Reg)) {
658 Extras.push_back(Reg);
662 while (NumExtras && !UnspilledCS2GPRs.empty()) {
663 unsigned Reg = UnspilledCS2GPRs.back();
664 UnspilledCS2GPRs.pop_back();
665 if (!isReservedReg(MF, Reg)) {
666 Extras.push_back(Reg);
670 if (Extras.size() && NumExtras == 0) {
671 for (unsigned i = 0, e = Extras.size(); i != e; ++i) {
672 MF.getRegInfo().setPhysRegUsed(Extras[i]);
673 AFI->setCSRegisterIsSpilled(Extras[i]);
676 // Reserve a slot closest to SP or frame pointer.
677 const TargetRegisterClass *RC = &ARM::GPRRegClass;
678 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
679 RC->getAlignment()));
686 MF.getRegInfo().setPhysRegUsed(ARM::LR);
687 AFI->setCSRegisterIsSpilled(ARM::LR);
688 AFI->setLRIsSpilledForFarJump(true);
692 unsigned ARMBaseRegisterInfo::getRARegister() const {
696 unsigned ARMBaseRegisterInfo::getFrameRegister(MachineFunction &MF) const {
697 if (STI.isTargetDarwin() || hasFP(MF))
702 unsigned ARMBaseRegisterInfo::getEHExceptionRegister() const {
703 assert(0 && "What is the exception register");
707 unsigned ARMBaseRegisterInfo::getEHHandlerRegister() const {
708 assert(0 && "What is the exception handler register");
712 int ARMBaseRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
713 return ARMGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
716 unsigned ARMBaseRegisterInfo::getRegisterPairEven(unsigned Reg,
717 const MachineFunction &MF) const {
720 // Return 0 if either register of the pair is a special register.
726 return STI.isThumb() ? 0 : ARM::R2;
730 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R6;
732 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R8;
734 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R10;
790 unsigned ARMBaseRegisterInfo::getRegisterPairOdd(unsigned Reg,
791 const MachineFunction &MF) const {
794 // Return 0 if either register of the pair is a special register.
800 return STI.isThumb() ? 0 : ARM::R3;
804 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R7;
806 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R9;
808 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R11;
864 #include "ARMGenRegisterInfo.inc"