1 //===- ARMRegisterInfo.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 ARM implementation of the TargetRegisterInfo class.
12 //===----------------------------------------------------------------------===//
15 #include "ARMAddressingModes.h"
16 #include "ARMInstrInfo.h"
17 #include "ARMMachineFunctionInfo.h"
18 #include "ARMRegisterInfo.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/Target/TargetFrameInfo.h"
30 #include "llvm/Target/TargetMachine.h"
31 #include "llvm/Target/TargetOptions.h"
32 #include "llvm/ADT/BitVector.h"
33 #include "llvm/ADT/SmallVector.h"
36 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
39 case R0: case S0: case D0: return 0;
40 case R1: case S1: case D1: return 1;
41 case R2: case S2: case D2: return 2;
42 case R3: case S3: case D3: return 3;
43 case R4: case S4: case D4: return 4;
44 case R5: case S5: case D5: return 5;
45 case R6: case S6: case D6: return 6;
46 case R7: case S7: case D7: return 7;
47 case R8: case S8: case D8: return 8;
48 case R9: case S9: case D9: return 9;
49 case R10: case S10: case D10: return 10;
50 case R11: case S11: case D11: return 11;
51 case R12: case S12: case D12: return 12;
52 case SP: case S13: case D13: return 13;
53 case LR: case S14: case D14: return 14;
54 case PC: case S15: case D15: return 15;
72 assert(0 && "Unknown ARM register!");
77 unsigned ARMBaseRegisterInfo::getRegisterNumbering(unsigned RegEnum,
84 assert(0 && "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 TargetInstrInfo &tii,
152 const ARMSubtarget &sti)
153 : ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
155 FramePtr((STI.isTargetDarwin() || STI.isThumb()) ? ARM::R7 : ARM::R11) {
158 ARMRegisterInfo::ARMRegisterInfo(const TargetInstrInfo &tii,
159 const ARMSubtarget &sti)
160 : ARMBaseRegisterInfo(tii, sti) {
164 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
165 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
169 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
170 return MIB.addReg(0);
173 /// emitLoadConstPool - Emits a load from constpool to materialize the
174 /// specified immediate.
175 void ARMRegisterInfo::emitLoadConstPool(MachineBasicBlock &MBB,
176 MachineBasicBlock::iterator &MBBI,
177 unsigned DestReg, int Val,
178 unsigned Pred, unsigned PredReg,
179 const TargetInstrInfo *TII,
181 MachineFunction &MF = *MBB.getParent();
182 MachineConstantPool *ConstantPool = MF.getConstantPool();
183 Constant *C = ConstantInt::get(Type::Int32Ty, Val);
184 unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
186 BuildMI(MBB, MBBI, dl, TII->get(ARM::LDRcp), DestReg)
187 .addConstantPoolIndex(Idx)
188 .addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
191 /// isLowRegister - Returns true if the register is low register r0-r7.
193 bool ARMBaseRegisterInfo::isLowRegister(unsigned Reg) const {
196 case R0: case R1: case R2: case R3:
197 case R4: case R5: case R6: case R7:
205 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
206 static const unsigned CalleeSavedRegs[] = {
207 ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
208 ARM::R7, ARM::R6, ARM::R5, ARM::R4,
210 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
211 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
215 static const unsigned DarwinCalleeSavedRegs[] = {
216 // Darwin ABI deviates from ARM standard ABI. R9 is not a callee-saved
218 ARM::LR, ARM::R7, ARM::R6, ARM::R5, ARM::R4,
219 ARM::R11, ARM::R10, ARM::R8,
221 ARM::D15, ARM::D14, ARM::D13, ARM::D12,
222 ARM::D11, ARM::D10, ARM::D9, ARM::D8,
225 return STI.isTargetDarwin() ? DarwinCalleeSavedRegs : CalleeSavedRegs;
228 const TargetRegisterClass* const *
229 ARMBaseRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
230 static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
231 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
232 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
233 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
235 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
236 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
240 static const TargetRegisterClass * const ThumbCalleeSavedRegClasses[] = {
241 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
242 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::tGPRRegClass,
243 &ARM::tGPRRegClass,&ARM::tGPRRegClass,&ARM::tGPRRegClass,
245 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
246 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
250 static const TargetRegisterClass * const DarwinCalleeSavedRegClasses[] = {
251 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
252 &ARM::GPRRegClass, &ARM::GPRRegClass, &ARM::GPRRegClass,
253 &ARM::GPRRegClass, &ARM::GPRRegClass,
255 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
256 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
260 static const TargetRegisterClass * const DarwinThumbCalleeSavedRegClasses[] ={
261 &ARM::GPRRegClass, &ARM::tGPRRegClass, &ARM::tGPRRegClass,
262 &ARM::tGPRRegClass, &ARM::tGPRRegClass, &ARM::GPRRegClass,
263 &ARM::GPRRegClass, &ARM::GPRRegClass,
265 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
266 &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass, &ARM::DPRRegClass,
271 return STI.isTargetDarwin()
272 ? DarwinThumbCalleeSavedRegClasses : ThumbCalleeSavedRegClasses;
274 return STI.isTargetDarwin()
275 ? DarwinCalleeSavedRegClasses : CalleeSavedRegClasses;
278 BitVector ARMBaseRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
279 // FIXME: avoid re-calculating this everytime.
280 BitVector Reserved(getNumRegs());
281 Reserved.set(ARM::SP);
282 Reserved.set(ARM::PC);
283 if (STI.isTargetDarwin() || hasFP(MF))
284 Reserved.set(FramePtr);
285 // Some targets reserve R9.
286 if (STI.isR9Reserved())
287 Reserved.set(ARM::R9);
292 ARMBaseRegisterInfo::isReservedReg(const MachineFunction &MF, unsigned Reg) const {
300 if (FramePtr == Reg && (STI.isTargetDarwin() || hasFP(MF)))
304 return STI.isR9Reserved();
310 const TargetRegisterClass *ARMBaseRegisterInfo::getPointerRegClass() const {
311 return &ARM::GPRRegClass;
314 /// getAllocationOrder - Returns the register allocation order for a specified
315 /// register class in the form of a pair of TargetRegisterClass iterators.
316 std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator>
317 ARMBaseRegisterInfo::getAllocationOrder(const TargetRegisterClass *RC,
318 unsigned HintType, unsigned HintReg,
319 const MachineFunction &MF) const {
320 // Alternative register allocation orders when favoring even / odd registers
321 // of register pairs.
323 // No FP, R9 is available.
324 static const unsigned GPREven1[] = {
325 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8, ARM::R10,
326 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7,
329 static const unsigned GPROdd1[] = {
330 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R9, ARM::R11,
331 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
335 // FP is R7, R9 is available.
336 static const unsigned GPREven2[] = {
337 ARM::R0, ARM::R2, ARM::R4, ARM::R8, ARM::R10,
338 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6,
341 static const unsigned GPROdd2[] = {
342 ARM::R1, ARM::R3, ARM::R5, ARM::R9, ARM::R11,
343 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6,
347 // FP is R11, R9 is available.
348 static const unsigned GPREven3[] = {
349 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R8,
350 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7,
353 static const unsigned GPROdd3[] = {
354 ARM::R1, ARM::R3, ARM::R5, ARM::R6, ARM::R9,
355 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R7,
359 // No FP, R9 is not available.
360 static const unsigned GPREven4[] = {
361 ARM::R0, ARM::R2, ARM::R4, ARM::R6, ARM::R10,
362 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8,
365 static const unsigned GPROdd4[] = {
366 ARM::R1, ARM::R3, ARM::R5, ARM::R7, ARM::R11,
367 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
371 // FP is R7, R9 is not available.
372 static const unsigned GPREven5[] = {
373 ARM::R0, ARM::R2, ARM::R4, ARM::R10,
374 ARM::R1, ARM::R3, ARM::R12,ARM::LR, ARM::R5, ARM::R6, ARM::R8,
377 static const unsigned GPROdd5[] = {
378 ARM::R1, ARM::R3, ARM::R5, ARM::R11,
379 ARM::R0, ARM::R2, ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8,
383 // FP is R11, R9 is not available.
384 static const unsigned GPREven6[] = {
385 ARM::R0, ARM::R2, ARM::R4, ARM::R6,
386 ARM::R1, ARM::R3, ARM::R10,ARM::R12,ARM::LR, ARM::R5, ARM::R7, ARM::R8
388 static const unsigned GPROdd6[] = {
389 ARM::R1, ARM::R3, ARM::R5, ARM::R7,
390 ARM::R0, ARM::R2, ARM::R10,ARM::R12,ARM::LR, ARM::R4, ARM::R6, ARM::R8
394 if (HintType == ARMRI::RegPairEven) {
395 if (isPhysicalRegister(HintReg) && getRegisterPairEven(HintReg, MF) == 0)
396 // It's no longer possible to fulfill this hint. Return the default
398 return std::make_pair(RC->allocation_order_begin(MF),
399 RC->allocation_order_end(MF));
401 if (!STI.isTargetDarwin() && !hasFP(MF)) {
402 if (!STI.isR9Reserved())
403 return std::make_pair(GPREven1,
404 GPREven1 + (sizeof(GPREven1)/sizeof(unsigned)));
406 return std::make_pair(GPREven4,
407 GPREven4 + (sizeof(GPREven4)/sizeof(unsigned)));
408 } else if (FramePtr == ARM::R7) {
409 if (!STI.isR9Reserved())
410 return std::make_pair(GPREven2,
411 GPREven2 + (sizeof(GPREven2)/sizeof(unsigned)));
413 return std::make_pair(GPREven5,
414 GPREven5 + (sizeof(GPREven5)/sizeof(unsigned)));
415 } else { // FramePtr == ARM::R11
416 if (!STI.isR9Reserved())
417 return std::make_pair(GPREven3,
418 GPREven3 + (sizeof(GPREven3)/sizeof(unsigned)));
420 return std::make_pair(GPREven6,
421 GPREven6 + (sizeof(GPREven6)/sizeof(unsigned)));
423 } else if (HintType == ARMRI::RegPairOdd) {
424 if (isPhysicalRegister(HintReg) && getRegisterPairOdd(HintReg, MF) == 0)
425 // It's no longer possible to fulfill this hint. Return the default
427 return std::make_pair(RC->allocation_order_begin(MF),
428 RC->allocation_order_end(MF));
430 if (!STI.isTargetDarwin() && !hasFP(MF)) {
431 if (!STI.isR9Reserved())
432 return std::make_pair(GPROdd1,
433 GPROdd1 + (sizeof(GPROdd1)/sizeof(unsigned)));
435 return std::make_pair(GPROdd4,
436 GPROdd4 + (sizeof(GPROdd4)/sizeof(unsigned)));
437 } else if (FramePtr == ARM::R7) {
438 if (!STI.isR9Reserved())
439 return std::make_pair(GPROdd2,
440 GPROdd2 + (sizeof(GPROdd2)/sizeof(unsigned)));
442 return std::make_pair(GPROdd5,
443 GPROdd5 + (sizeof(GPROdd5)/sizeof(unsigned)));
444 } else { // FramePtr == ARM::R11
445 if (!STI.isR9Reserved())
446 return std::make_pair(GPROdd3,
447 GPROdd3 + (sizeof(GPROdd3)/sizeof(unsigned)));
449 return std::make_pair(GPROdd6,
450 GPROdd6 + (sizeof(GPROdd6)/sizeof(unsigned)));
453 return std::make_pair(RC->allocation_order_begin(MF),
454 RC->allocation_order_end(MF));
457 /// ResolveRegAllocHint - Resolves the specified register allocation hint
458 /// to a physical register. Returns the physical register if it is successful.
460 ARMBaseRegisterInfo::ResolveRegAllocHint(unsigned Type, unsigned Reg,
461 const MachineFunction &MF) const {
462 if (Reg == 0 || !isPhysicalRegister(Reg))
466 else if (Type == (unsigned)ARMRI::RegPairOdd)
468 return getRegisterPairOdd(Reg, MF);
469 else if (Type == (unsigned)ARMRI::RegPairEven)
471 return getRegisterPairEven(Reg, MF);
476 ARMBaseRegisterInfo::UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
477 MachineFunction &MF) const {
478 MachineRegisterInfo *MRI = &MF.getRegInfo();
479 std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(Reg);
480 if ((Hint.first == (unsigned)ARMRI::RegPairOdd ||
481 Hint.first == (unsigned)ARMRI::RegPairEven) &&
482 Hint.second && TargetRegisterInfo::isVirtualRegister(Hint.second)) {
483 // If 'Reg' is one of the even / odd register pair and it's now changed
484 // (e.g. coalesced) into a different register. The other register of the
485 // pair allocation hint must be updated to reflect the relationship
487 unsigned OtherReg = Hint.second;
488 Hint = MRI->getRegAllocationHint(OtherReg);
489 if (Hint.second == Reg)
490 // Make sure the pair has not already divorced.
491 MRI->setRegAllocationHint(OtherReg, Hint.first, NewReg);
496 ARMRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
500 /// hasFP - Return true if the specified function should have a dedicated frame
501 /// pointer register. This is true if the function has variable sized allocas
502 /// or if frame pointer elimination is disabled.
504 bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
505 const MachineFrameInfo *MFI = MF.getFrameInfo();
506 return (NoFramePointerElim ||
507 MFI->hasVarSizedObjects() ||
508 MFI->isFrameAddressTaken());
511 // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
512 // not required, we reserve argument space for call sites in the function
513 // immediately on entry to the current function. This eliminates the need for
514 // add/sub sp brackets around call sites. Returns true if the call frame is
515 // included as part of the stack frame.
516 bool ARMRegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
517 const MachineFrameInfo *FFI = MF.getFrameInfo();
518 unsigned CFSize = FFI->getMaxCallFrameSize();
519 // It's not always a good idea to include the call frame as part of the
520 // stack frame. ARM (especially Thumb) has small immediate offset to
521 // address the stack frame. So a large call frame can cause poor codegen
522 // and may even makes it impossible to scavenge a register.
523 if (CFSize >= ((1 << 12) - 1) / 2) // Half of imm12
526 return !MF.getFrameInfo()->hasVarSizedObjects();
529 /// emitARMRegPlusImmediate - Emits a series of instructions to materialize
530 /// a destreg = basereg + immediate in ARM code.
532 void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
533 MachineBasicBlock::iterator &MBBI,
534 unsigned DestReg, unsigned BaseReg, int NumBytes,
535 ARMCC::CondCodes Pred, unsigned PredReg,
536 const TargetInstrInfo &TII,
538 bool isSub = NumBytes < 0;
539 if (isSub) NumBytes = -NumBytes;
542 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
543 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
544 assert(ThisVal && "Didn't extract field correctly");
546 // We will handle these bits from offset, clear them.
547 NumBytes &= ~ThisVal;
549 // Get the properly encoded SOImmVal field.
550 int SOImmVal = ARM_AM::getSOImmVal(ThisVal);
551 assert(SOImmVal != -1 && "Bit extraction didn't work?");
553 // Build the new ADD / SUB.
554 BuildMI(MBB, MBBI, dl, TII.get(isSub ? ARM::SUBri : ARM::ADDri), DestReg)
555 .addReg(BaseReg, RegState::Kill).addImm(SOImmVal)
556 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
561 void ARMRegisterInfo::
562 emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
563 int NumBytes, ARMCC::CondCodes Pred, unsigned PredReg,
564 const TargetInstrInfo &TII, DebugLoc dl) const {
565 emitARMRegPlusImmediate(MBB, MBBI, ARM::SP, ARM::SP, NumBytes,
566 Pred, PredReg, TII, dl);
569 void ARMRegisterInfo::
570 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
571 MachineBasicBlock::iterator I) const {
572 if (!hasReservedCallFrame(MF)) {
573 // If we have alloca, convert as follows:
574 // ADJCALLSTACKDOWN -> sub, sp, sp, amount
575 // ADJCALLSTACKUP -> add, sp, sp, amount
576 MachineInstr *Old = I;
577 DebugLoc dl = Old->getDebugLoc();
578 unsigned Amount = Old->getOperand(0).getImm();
580 // We need to keep the stack aligned properly. To do this, we round the
581 // amount of space needed for the outgoing arguments up to the next
582 // alignment boundary.
583 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
584 Amount = (Amount+Align-1)/Align*Align;
586 // Replace the pseudo instruction with a new instruction...
587 unsigned Opc = Old->getOpcode();
588 ARMCC::CondCodes Pred = (ARMCC::CondCodes)Old->getOperand(1).getImm();
589 if (Opc == ARM::ADJCALLSTACKDOWN || Opc == ARM::tADJCALLSTACKDOWN) {
590 // Note: PredReg is operand 2 for ADJCALLSTACKDOWN.
591 unsigned PredReg = Old->getOperand(2).getReg();
592 emitSPUpdate(MBB, I, -Amount, Pred, PredReg, TII, dl);
594 // Note: PredReg is operand 3 for ADJCALLSTACKUP.
595 unsigned PredReg = Old->getOperand(3).getReg();
596 assert(Opc == ARM::ADJCALLSTACKUP || Opc == ARM::tADJCALLSTACKUP);
597 emitSPUpdate(MBB, I, Amount, Pred, PredReg, TII, dl);
604 /// findScratchRegister - Find a 'free' ARM register. If register scavenger
605 /// is not being used, R12 is available. Otherwise, try for a call-clobbered
606 /// register first and then a spilled callee-saved register if that fails.
608 unsigned findScratchRegister(RegScavenger *RS, const TargetRegisterClass *RC,
609 ARMFunctionInfo *AFI) {
610 unsigned Reg = RS ? RS->FindUnusedReg(RC, true) : (unsigned) ARM::R12;
611 assert (!AFI->isThumbFunction());
613 // Try a already spilled CS register.
614 Reg = RS->FindUnusedReg(RC, AFI->getSpilledCSRegisters());
619 void ARMRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
620 int SPAdj, RegScavenger *RS) const{
622 MachineInstr &MI = *II;
623 MachineBasicBlock &MBB = *MI.getParent();
624 MachineFunction &MF = *MBB.getParent();
625 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
626 DebugLoc dl = MI.getDebugLoc();
628 while (!MI.getOperand(i).isFI()) {
630 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
633 unsigned FrameReg = ARM::SP;
634 int FrameIndex = MI.getOperand(i).getIndex();
635 int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
636 MF.getFrameInfo()->getStackSize() + SPAdj;
638 if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
639 Offset -= AFI->getGPRCalleeSavedArea1Offset();
640 else if (AFI->isGPRCalleeSavedArea2Frame(FrameIndex))
641 Offset -= AFI->getGPRCalleeSavedArea2Offset();
642 else if (AFI->isDPRCalleeSavedAreaFrame(FrameIndex))
643 Offset -= AFI->getDPRCalleeSavedAreaOffset();
644 else if (hasFP(MF)) {
645 assert(SPAdj == 0 && "Unexpected");
646 // There is alloca()'s in this function, must reference off the frame
648 FrameReg = getFrameRegister(MF);
649 Offset -= AFI->getFramePtrSpillOffset();
652 unsigned Opcode = MI.getOpcode();
653 const TargetInstrDesc &Desc = MI.getDesc();
654 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
657 // Memory operands in inline assembly always use AddrMode2.
658 if (Opcode == ARM::INLINEASM)
659 AddrMode = ARMII::AddrMode2;
661 if (Opcode == ARM::ADDri) {
662 Offset += MI.getOperand(i+1).getImm();
664 // Turn it into a move.
665 MI.setDesc(TII.get(ARM::MOVr));
666 MI.getOperand(i).ChangeToRegister(FrameReg, false);
667 MI.RemoveOperand(i+1);
669 } else if (Offset < 0) {
672 MI.setDesc(TII.get(ARM::SUBri));
675 // Common case: small offset, fits into instruction.
676 int ImmedOffset = ARM_AM::getSOImmVal(Offset);
677 if (ImmedOffset != -1) {
678 // Replace the FrameIndex with sp / fp
679 MI.getOperand(i).ChangeToRegister(FrameReg, false);
680 MI.getOperand(i+1).ChangeToImmediate(ImmedOffset);
684 // Otherwise, we fallback to common code below to form the imm offset with
685 // a sequence of ADDri instructions. First though, pull as much of the imm
686 // into this ADDri as possible.
687 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
688 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
690 // We will handle these bits from offset, clear them.
691 Offset &= ~ThisImmVal;
693 // Get the properly encoded SOImmVal field.
694 int ThisSOImmVal = ARM_AM::getSOImmVal(ThisImmVal);
695 assert(ThisSOImmVal != -1 && "Bit extraction didn't work?");
696 MI.getOperand(i+1).ChangeToImmediate(ThisSOImmVal);
700 unsigned NumBits = 0;
703 case ARMII::AddrMode2: {
705 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
706 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
711 case ARMII::AddrMode3: {
713 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
714 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
719 case ARMII::AddrMode5: {
721 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
722 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
729 assert(0 && "Unsupported addressing mode!");
734 Offset += InstrOffs * Scale;
735 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
741 // Common case: small offset, fits into instruction.
742 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
743 int ImmedOffset = Offset / Scale;
744 unsigned Mask = (1 << NumBits) - 1;
745 if ((unsigned)Offset <= Mask * Scale) {
746 // Replace the FrameIndex with sp
747 MI.getOperand(i).ChangeToRegister(FrameReg, false);
749 ImmedOffset |= 1 << NumBits;
750 ImmOp.ChangeToImmediate(ImmedOffset);
754 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
755 ImmedOffset = ImmedOffset & Mask;
757 ImmedOffset |= 1 << NumBits;
758 ImmOp.ChangeToImmediate(ImmedOffset);
759 Offset &= ~(Mask*Scale);
762 // If we get here, the immediate doesn't fit into the instruction. We folded
763 // as much as possible above, handle the rest, providing a register that is
765 assert(Offset && "This code isn't needed if offset already handled!");
767 // Insert a set of r12 with the full address: r12 = sp + offset
768 // If the offset we have is too large to fit into the instruction, we need
769 // to form it with a series of ADDri's. Do this by taking 8-bit chunks
771 unsigned ScratchReg = findScratchRegister(RS, &ARM::GPRRegClass, AFI);
773 // No register is "free". Scavenge a register.
774 ScratchReg = RS->scavengeRegister(&ARM::GPRRegClass, II, SPAdj);
775 int PIdx = MI.findFirstPredOperandIdx();
776 ARMCC::CondCodes Pred = (PIdx == -1)
777 ? ARMCC::AL : (ARMCC::CondCodes)MI.getOperand(PIdx).getImm();
778 unsigned PredReg = (PIdx == -1) ? 0 : MI.getOperand(PIdx+1).getReg();
779 emitARMRegPlusImmediate(MBB, II, ScratchReg, FrameReg,
780 isSub ? -Offset : Offset, Pred, PredReg, TII, dl);
781 MI.getOperand(i).ChangeToRegister(ScratchReg, false, false, true);
784 static unsigned estimateStackSize(MachineFunction &MF, MachineFrameInfo *MFI) {
785 const MachineFrameInfo *FFI = MF.getFrameInfo();
787 for (int i = FFI->getObjectIndexBegin(); i != 0; ++i) {
788 int FixedOff = -FFI->getObjectOffset(i);
789 if (FixedOff > Offset) Offset = FixedOff;
791 for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
792 if (FFI->isDeadObjectIndex(i))
794 Offset += FFI->getObjectSize(i);
795 unsigned Align = FFI->getObjectAlignment(i);
796 // Adjust to alignment boundary
797 Offset = (Offset+Align-1)/Align*Align;
799 return (unsigned)Offset;
803 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
804 RegScavenger *RS) const {
805 // This tells PEI to spill the FP as if it is any other callee-save register
806 // to take advantage the eliminateFrameIndex machinery. This also ensures it
807 // is spilled in the order specified by getCalleeSavedRegs() to make it easier
808 // to combine multiple loads / stores.
809 bool CanEliminateFrame = true;
810 bool CS1Spilled = false;
811 bool LRSpilled = false;
812 unsigned NumGPRSpills = 0;
813 SmallVector<unsigned, 4> UnspilledCS1GPRs;
814 SmallVector<unsigned, 4> UnspilledCS2GPRs;
815 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
817 // Don't spill FP if the frame can be eliminated. This is determined
818 // by scanning the callee-save registers to see if any is used.
819 const unsigned *CSRegs = getCalleeSavedRegs();
820 const TargetRegisterClass* const *CSRegClasses = getCalleeSavedRegClasses();
821 for (unsigned i = 0; CSRegs[i]; ++i) {
822 unsigned Reg = CSRegs[i];
823 bool Spilled = false;
824 if (MF.getRegInfo().isPhysRegUsed(Reg)) {
825 AFI->setCSRegisterIsSpilled(Reg);
827 CanEliminateFrame = false;
829 // Check alias registers too.
830 for (const unsigned *Aliases = getAliasSet(Reg); *Aliases; ++Aliases) {
831 if (MF.getRegInfo().isPhysRegUsed(*Aliases)) {
833 CanEliminateFrame = false;
838 if (CSRegClasses[i] == &ARM::GPRRegClass) {
842 if (!STI.isTargetDarwin()) {
849 // Keep track if LR and any of R4, R5, R6, and R7 is spilled.
864 if (!STI.isTargetDarwin()) {
865 UnspilledCS1GPRs.push_back(Reg);
875 UnspilledCS1GPRs.push_back(Reg);
878 UnspilledCS2GPRs.push_back(Reg);
885 bool ForceLRSpill = false;
886 if (!LRSpilled && AFI->isThumbFunction()) {
887 unsigned FnSize = TII.GetFunctionSizeInBytes(MF);
888 // Force LR to be spilled if the Thumb function size is > 2048. This enables
889 // use of BL to implement far jump. If it turns out that it's not needed
890 // then the branch fix up path will undo it.
891 if (FnSize >= (1 << 11)) {
892 CanEliminateFrame = false;
897 bool ExtraCSSpill = false;
898 if (!CanEliminateFrame || hasFP(MF)) {
899 AFI->setHasStackFrame(true);
901 // If LR is not spilled, but at least one of R4, R5, R6, and R7 is spilled.
902 // Spill LR as well so we can fold BX_RET to the registers restore (LDM).
903 if (!LRSpilled && CS1Spilled) {
904 MF.getRegInfo().setPhysRegUsed(ARM::LR);
905 AFI->setCSRegisterIsSpilled(ARM::LR);
907 UnspilledCS1GPRs.erase(std::find(UnspilledCS1GPRs.begin(),
908 UnspilledCS1GPRs.end(), (unsigned)ARM::LR));
909 ForceLRSpill = false;
913 // Darwin ABI requires FP to point to the stack slot that contains the
915 if (STI.isTargetDarwin() || hasFP(MF)) {
916 MF.getRegInfo().setPhysRegUsed(FramePtr);
920 // If stack and double are 8-byte aligned and we are spilling an odd number
921 // of GPRs. Spill one extra callee save GPR so we won't have to pad between
922 // the integer and double callee save areas.
923 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
924 if (TargetAlign == 8 && (NumGPRSpills & 1)) {
925 if (CS1Spilled && !UnspilledCS1GPRs.empty()) {
926 for (unsigned i = 0, e = UnspilledCS1GPRs.size(); i != e; ++i) {
927 unsigned Reg = UnspilledCS1GPRs[i];
928 // Don't spiil high register if the function is thumb
929 if (!AFI->isThumbFunction() || isLowRegister(Reg) || Reg == ARM::LR) {
930 MF.getRegInfo().setPhysRegUsed(Reg);
931 AFI->setCSRegisterIsSpilled(Reg);
932 if (!isReservedReg(MF, Reg))
937 } else if (!UnspilledCS2GPRs.empty() &&
938 !AFI->isThumbFunction()) {
939 unsigned Reg = UnspilledCS2GPRs.front();
940 MF.getRegInfo().setPhysRegUsed(Reg);
941 AFI->setCSRegisterIsSpilled(Reg);
942 if (!isReservedReg(MF, Reg))
947 // Estimate if we might need to scavenge a register at some point in order
948 // to materialize a stack offset. If so, either spill one additiona
949 // callee-saved register or reserve a special spill slot to facilitate
950 // register scavenging.
951 if (RS && !ExtraCSSpill && !AFI->isThumbFunction()) {
952 MachineFrameInfo *MFI = MF.getFrameInfo();
953 unsigned Size = estimateStackSize(MF, MFI);
954 unsigned Limit = (1 << 12) - 1;
955 for (MachineFunction::iterator BB = MF.begin(),E = MF.end();BB != E; ++BB)
956 for (MachineBasicBlock::iterator I= BB->begin(); I != BB->end(); ++I) {
957 for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
958 if (I->getOperand(i).isFI()) {
959 unsigned Opcode = I->getOpcode();
960 const TargetInstrDesc &Desc = TII.get(Opcode);
961 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
962 if (AddrMode == ARMII::AddrMode3) {
963 Limit = (1 << 8) - 1;
965 } else if (AddrMode == ARMII::AddrMode5) {
966 unsigned ThisLimit = ((1 << 8) - 1) * 4;
967 if (ThisLimit < Limit)
974 // If any non-reserved CS register isn't spilled, just spill one or two
975 // extra. That should take care of it!
976 unsigned NumExtras = TargetAlign / 4;
977 SmallVector<unsigned, 2> Extras;
978 while (NumExtras && !UnspilledCS1GPRs.empty()) {
979 unsigned Reg = UnspilledCS1GPRs.back();
980 UnspilledCS1GPRs.pop_back();
981 if (!isReservedReg(MF, Reg)) {
982 Extras.push_back(Reg);
986 while (NumExtras && !UnspilledCS2GPRs.empty()) {
987 unsigned Reg = UnspilledCS2GPRs.back();
988 UnspilledCS2GPRs.pop_back();
989 if (!isReservedReg(MF, Reg)) {
990 Extras.push_back(Reg);
994 if (Extras.size() && NumExtras == 0) {
995 for (unsigned i = 0, e = Extras.size(); i != e; ++i) {
996 MF.getRegInfo().setPhysRegUsed(Extras[i]);
997 AFI->setCSRegisterIsSpilled(Extras[i]);
1000 // Reserve a slot closest to SP or frame pointer.
1001 const TargetRegisterClass *RC = &ARM::GPRRegClass;
1002 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
1003 RC->getAlignment()));
1010 MF.getRegInfo().setPhysRegUsed(ARM::LR);
1011 AFI->setCSRegisterIsSpilled(ARM::LR);
1012 AFI->setLRIsSpilledForFarJump(true);
1016 /// Move iterator pass the next bunch of callee save load / store ops for
1017 /// the particular spill area (1: integer area 1, 2: integer area 2,
1018 /// 3: fp area, 0: don't care).
1019 static void movePastCSLoadStoreOps(MachineBasicBlock &MBB,
1020 MachineBasicBlock::iterator &MBBI,
1021 int Opc, unsigned Area,
1022 const ARMSubtarget &STI) {
1023 while (MBBI != MBB.end() &&
1024 MBBI->getOpcode() == Opc && MBBI->getOperand(1).isFI()) {
1027 unsigned Category = 0;
1028 switch (MBBI->getOperand(0).getReg()) {
1029 case ARM::R4: case ARM::R5: case ARM::R6: case ARM::R7:
1033 case ARM::R8: case ARM::R9: case ARM::R10: case ARM::R11:
1034 Category = STI.isTargetDarwin() ? 2 : 1;
1036 case ARM::D8: case ARM::D9: case ARM::D10: case ARM::D11:
1037 case ARM::D12: case ARM::D13: case ARM::D14: case ARM::D15:
1044 if (Done || Category != Area)
1052 void ARMRegisterInfo::emitPrologue(MachineFunction &MF) const {
1053 MachineBasicBlock &MBB = MF.front();
1054 MachineBasicBlock::iterator MBBI = MBB.begin();
1055 MachineFrameInfo *MFI = MF.getFrameInfo();
1056 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1057 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1058 unsigned NumBytes = MFI->getStackSize();
1059 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1060 DebugLoc dl = (MBBI != MBB.end() ?
1061 MBBI->getDebugLoc() : DebugLoc::getUnknownLoc());
1063 // Determine the sizes of each callee-save spill areas and record which frame
1064 // belongs to which callee-save spill areas.
1065 unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
1066 int FramePtrSpillFI = 0;
1069 emitSPUpdate(MBB, MBBI, -VARegSaveSize, ARMCC::AL, 0, TII, dl);
1071 if (!AFI->hasStackFrame()) {
1073 emitSPUpdate(MBB, MBBI, -NumBytes, ARMCC::AL, 0, TII, dl);
1077 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1078 unsigned Reg = CSI[i].getReg();
1079 int FI = CSI[i].getFrameIdx();
1086 if (Reg == FramePtr)
1087 FramePtrSpillFI = FI;
1088 AFI->addGPRCalleeSavedArea1Frame(FI);
1095 if (Reg == FramePtr)
1096 FramePtrSpillFI = FI;
1097 if (STI.isTargetDarwin()) {
1098 AFI->addGPRCalleeSavedArea2Frame(FI);
1101 AFI->addGPRCalleeSavedArea1Frame(FI);
1106 AFI->addDPRCalleeSavedAreaFrame(FI);
1111 // Build the new SUBri to adjust SP for integer callee-save spill area 1.
1112 emitSPUpdate(MBB, MBBI, -GPRCS1Size, ARMCC::AL, 0, TII, dl);
1113 movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 1, STI);
1115 // Darwin ABI requires FP to point to the stack slot that contains the
1117 if (STI.isTargetDarwin() || hasFP(MF)) {
1118 MachineInstrBuilder MIB =
1119 BuildMI(MBB, MBBI, dl, TII.get(ARM::ADDri), FramePtr)
1120 .addFrameIndex(FramePtrSpillFI).addImm(0);
1121 AddDefaultCC(AddDefaultPred(MIB));
1124 // Build the new SUBri to adjust SP for integer callee-save spill area 2.
1125 emitSPUpdate(MBB, MBBI, -GPRCS2Size, ARMCC::AL, 0, TII, dl);
1127 // Build the new SUBri to adjust SP for FP callee-save spill area.
1128 movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 2, STI);
1129 emitSPUpdate(MBB, MBBI, -DPRCSSize, ARMCC::AL, 0, TII, dl);
1131 // Determine starting offsets of spill areas.
1132 unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
1133 unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
1134 unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
1135 AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
1136 AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
1137 AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
1138 AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
1140 NumBytes = DPRCSOffset;
1142 // Insert it after all the callee-save spills.
1143 movePastCSLoadStoreOps(MBB, MBBI, ARM::FSTD, 3, STI);
1144 emitSPUpdate(MBB, MBBI, -NumBytes, ARMCC::AL, 0, TII, dl);
1147 if (STI.isTargetELF() && hasFP(MF)) {
1148 MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
1149 AFI->getFramePtrSpillOffset());
1152 AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
1153 AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
1154 AFI->setDPRCalleeSavedAreaSize(DPRCSSize);
1157 static bool isCalleeSavedRegister(unsigned Reg, const unsigned *CSRegs) {
1158 for (unsigned i = 0; CSRegs[i]; ++i)
1159 if (Reg == CSRegs[i])
1164 static bool isCSRestore(MachineInstr *MI, const unsigned *CSRegs) {
1165 return ((MI->getOpcode() == ARM::FLDD ||
1166 MI->getOpcode() == ARM::LDR) &&
1167 MI->getOperand(1).isFI() &&
1168 isCalleeSavedRegister(MI->getOperand(0).getReg(), CSRegs));
1171 void ARMRegisterInfo::emitEpilogue(MachineFunction &MF,
1172 MachineBasicBlock &MBB) const {
1173 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1174 assert(MBBI->getOpcode() == ARM::BX_RET &&
1175 "Can only insert epilog into returning blocks");
1176 DebugLoc dl = MBBI->getDebugLoc();
1177 MachineFrameInfo *MFI = MF.getFrameInfo();
1178 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1179 unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
1180 int NumBytes = (int)MFI->getStackSize();
1182 if (!AFI->hasStackFrame()) {
1184 emitSPUpdate(MBB, MBBI, NumBytes, ARMCC::AL, 0, TII, dl);
1186 // Unwind MBBI to point to first LDR / FLDD.
1187 const unsigned *CSRegs = getCalleeSavedRegs();
1188 if (MBBI != MBB.begin()) {
1191 while (MBBI != MBB.begin() && isCSRestore(MBBI, CSRegs));
1192 if (!isCSRestore(MBBI, CSRegs))
1196 // Move SP to start of FP callee save spill area.
1197 NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
1198 AFI->getGPRCalleeSavedArea2Size() +
1199 AFI->getDPRCalleeSavedAreaSize());
1201 // Darwin ABI requires FP to point to the stack slot that contains the
1203 if ((STI.isTargetDarwin() && NumBytes) || hasFP(MF)) {
1204 NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
1205 // Reset SP based on frame pointer only if the stack frame extends beyond
1206 // frame pointer stack slot or target is ELF and the function has FP.
1207 if (AFI->getGPRCalleeSavedArea2Size() ||
1208 AFI->getDPRCalleeSavedAreaSize() ||
1209 AFI->getDPRCalleeSavedAreaOffset()||
1212 BuildMI(MBB, MBBI, dl, TII.get(ARM::SUBri), ARM::SP).addReg(FramePtr)
1214 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1216 BuildMI(MBB, MBBI, dl, TII.get(ARM::MOVr), ARM::SP).addReg(FramePtr)
1217 .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
1219 } else if (NumBytes) {
1220 emitSPUpdate(MBB, MBBI, NumBytes, ARMCC::AL, 0, TII, dl);
1223 // Move SP to start of integer callee save spill area 2.
1224 movePastCSLoadStoreOps(MBB, MBBI, ARM::FLDD, 3, STI);
1225 emitSPUpdate(MBB, MBBI, AFI->getDPRCalleeSavedAreaSize(), ARMCC::AL, 0,
1228 // Move SP to start of integer callee save spill area 1.
1229 movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 2, STI);
1230 emitSPUpdate(MBB, MBBI, AFI->getGPRCalleeSavedArea2Size(), ARMCC::AL, 0,
1233 // Move SP to SP upon entry to the function.
1234 movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 1, STI);
1235 emitSPUpdate(MBB, MBBI, AFI->getGPRCalleeSavedArea1Size(), ARMCC::AL, 0,
1240 emitSPUpdate(MBB, MBBI, VARegSaveSize, ARMCC::AL, 0, TII, dl);
1244 unsigned ARMBaseRegisterInfo::getRARegister() const {
1248 unsigned ARMBaseRegisterInfo::getFrameRegister(MachineFunction &MF) const {
1249 if (STI.isTargetDarwin() || hasFP(MF))
1254 unsigned ARMBaseRegisterInfo::getEHExceptionRegister() const {
1255 assert(0 && "What is the exception register");
1259 unsigned ARMBaseRegisterInfo::getEHHandlerRegister() const {
1260 assert(0 && "What is the exception handler register");
1264 int ARMBaseRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
1265 return ARMGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
1268 unsigned ARMBaseRegisterInfo::getRegisterPairEven(unsigned Reg,
1269 const MachineFunction &MF) const {
1272 // Return 0 if either register of the pair is a special register.
1278 return STI.isThumb() ? 0 : ARM::R2;
1282 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R6;
1284 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R8;
1286 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R10;
1342 unsigned ARMBaseRegisterInfo::getRegisterPairOdd(unsigned Reg,
1343 const MachineFunction &MF) const {
1346 // Return 0 if either register of the pair is a special register.
1352 return STI.isThumb() ? 0 : ARM::R3;
1356 return isReservedReg(MF, ARM::R7) ? 0 : ARM::R7;
1358 return isReservedReg(MF, ARM::R9) ? 0 :ARM::R9;
1360 return isReservedReg(MF, ARM::R11) ? 0 : ARM::R11;
1416 #include "ARMGenRegisterInfo.inc"