1 //===- ARMInstrInfo.cpp - ARM Instruction 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 TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "ARMInstrInfo.h"
16 #include "ARMAddressingModes.h"
17 #include "ARMGenInstrInfo.inc"
18 #include "ARMMachineFunctionInfo.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/CodeGen/LiveVariables.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/Target/TargetAsmInfo.h"
25 #include "llvm/Support/CommandLine.h"
28 static cl::opt<bool> EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
29 cl::desc("Enable ARM 2-addr to 3-addr conv"));
32 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
33 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
37 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
41 ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
42 : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)),
47 /// Return true if the instruction is a register to register move and
48 /// leave the source and dest operands in the passed parameters.
50 bool ARMInstrInfo::isMoveInstr(const MachineInstr &MI,
51 unsigned &SrcReg, unsigned &DstReg,
52 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
53 SrcSubIdx = DstSubIdx = 0; // No sub-registers.
55 unsigned oc = MI.getOpcode();
61 SrcReg = MI.getOperand(1).getReg();
62 DstReg = MI.getOperand(0).getReg();
66 assert(MI.getDesc().getNumOperands() >= 2 &&
67 MI.getOperand(0).isReg() &&
68 MI.getOperand(1).isReg() &&
69 "Invalid ARM MOV instruction");
70 SrcReg = MI.getOperand(1).getReg();
71 DstReg = MI.getOperand(0).getReg();
76 unsigned ARMInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
77 int &FrameIndex) const {
78 switch (MI->getOpcode()) {
81 if (MI->getOperand(1).isFI() &&
82 MI->getOperand(2).isReg() &&
83 MI->getOperand(3).isImm() &&
84 MI->getOperand(2).getReg() == 0 &&
85 MI->getOperand(3).getImm() == 0) {
86 FrameIndex = MI->getOperand(1).getIndex();
87 return MI->getOperand(0).getReg();
92 if (MI->getOperand(1).isFI() &&
93 MI->getOperand(2).isImm() &&
94 MI->getOperand(2).getImm() == 0) {
95 FrameIndex = MI->getOperand(1).getIndex();
96 return MI->getOperand(0).getReg();
100 if (MI->getOperand(1).isFI() &&
101 MI->getOperand(2).isImm() &&
102 MI->getOperand(2).getImm() == 0) {
103 FrameIndex = MI->getOperand(1).getIndex();
104 return MI->getOperand(0).getReg();
111 unsigned ARMInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
112 int &FrameIndex) const {
113 switch (MI->getOpcode()) {
116 if (MI->getOperand(1).isFI() &&
117 MI->getOperand(2).isReg() &&
118 MI->getOperand(3).isImm() &&
119 MI->getOperand(2).getReg() == 0 &&
120 MI->getOperand(3).getImm() == 0) {
121 FrameIndex = MI->getOperand(1).getIndex();
122 return MI->getOperand(0).getReg();
127 if (MI->getOperand(1).isFI() &&
128 MI->getOperand(2).isImm() &&
129 MI->getOperand(2).getImm() == 0) {
130 FrameIndex = MI->getOperand(1).getIndex();
131 return MI->getOperand(0).getReg();
135 if (MI->getOperand(1).isFI() &&
136 MI->getOperand(2).isImm() &&
137 MI->getOperand(2).getImm() == 0) {
138 FrameIndex = MI->getOperand(1).getIndex();
139 return MI->getOperand(0).getReg();
146 void ARMInstrInfo::reMaterialize(MachineBasicBlock &MBB,
147 MachineBasicBlock::iterator I,
149 const MachineInstr *Orig) const {
150 if (Orig->getOpcode() == ARM::MOVi2pieces) {
151 RI.emitLoadConstPool(MBB, I, DestReg, Orig->getOperand(1).getImm(),
152 Orig->getOperand(2).getImm(),
153 Orig->getOperand(3).getReg(), this, false);
157 MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
158 MI->getOperand(0).setReg(DestReg);
162 static unsigned getUnindexedOpcode(unsigned Opc) {
175 case ARM::LDRSH_POST:
178 case ARM::LDRSB_POST:
194 ARMInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
195 MachineBasicBlock::iterator &MBBI,
196 LiveVariables *LV) const {
200 MachineInstr *MI = MBBI;
201 MachineFunction &MF = *MI->getParent()->getParent();
202 unsigned TSFlags = MI->getDesc().TSFlags;
204 switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
205 default: return NULL;
206 case ARMII::IndexModePre:
209 case ARMII::IndexModePost:
213 // Try spliting an indexed load / store to a un-indexed one plus an add/sub
215 unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
219 MachineInstr *UpdateMI = NULL;
220 MachineInstr *MemMI = NULL;
221 unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
222 const TargetInstrDesc &TID = MI->getDesc();
223 unsigned NumOps = TID.getNumOperands();
224 bool isLoad = !TID.mayStore();
225 const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
226 const MachineOperand &Base = MI->getOperand(2);
227 const MachineOperand &Offset = MI->getOperand(NumOps-3);
228 unsigned WBReg = WB.getReg();
229 unsigned BaseReg = Base.getReg();
230 unsigned OffReg = Offset.getReg();
231 unsigned OffImm = MI->getOperand(NumOps-2).getImm();
232 ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
235 assert(false && "Unknown indexed op!");
237 case ARMII::AddrMode2: {
238 bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
239 unsigned Amt = ARM_AM::getAM2Offset(OffImm);
241 int SOImmVal = ARM_AM::getSOImmVal(Amt);
243 // Can't encode it in a so_imm operand. This transformation will
244 // add more than 1 instruction. Abandon!
246 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
247 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
248 .addReg(BaseReg).addImm(SOImmVal)
249 .addImm(Pred).addReg(0).addReg(0);
250 } else if (Amt != 0) {
251 ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
252 unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
253 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
254 get(isSub ? ARM::SUBrs : ARM::ADDrs), WBReg)
255 .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc)
256 .addImm(Pred).addReg(0).addReg(0);
258 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
259 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
260 .addReg(BaseReg).addReg(OffReg)
261 .addImm(Pred).addReg(0).addReg(0);
264 case ARMII::AddrMode3 : {
265 bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
266 unsigned Amt = ARM_AM::getAM3Offset(OffImm);
268 // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
269 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
270 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
271 .addReg(BaseReg).addImm(Amt)
272 .addImm(Pred).addReg(0).addReg(0);
274 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
275 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
276 .addReg(BaseReg).addReg(OffReg)
277 .addImm(Pred).addReg(0).addReg(0);
282 std::vector<MachineInstr*> NewMIs;
285 MemMI = BuildMI(MF, MI->getDebugLoc(),
286 get(MemOpc), MI->getOperand(0).getReg())
287 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
289 MemMI = BuildMI(MF, MI->getDebugLoc(),
290 get(MemOpc)).addReg(MI->getOperand(1).getReg())
291 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
292 NewMIs.push_back(MemMI);
293 NewMIs.push_back(UpdateMI);
296 MemMI = BuildMI(MF, MI->getDebugLoc(),
297 get(MemOpc), MI->getOperand(0).getReg())
298 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
300 MemMI = BuildMI(MF, MI->getDebugLoc(),
301 get(MemOpc)).addReg(MI->getOperand(1).getReg())
302 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
304 UpdateMI->getOperand(0).setIsDead();
305 NewMIs.push_back(UpdateMI);
306 NewMIs.push_back(MemMI);
309 // Transfer LiveVariables states, kill / dead info.
311 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
312 MachineOperand &MO = MI->getOperand(i);
313 if (MO.isReg() && MO.getReg() &&
314 TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
315 unsigned Reg = MO.getReg();
317 LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
319 MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
321 LV->addVirtualRegisterDead(Reg, NewMI);
323 if (MO.isUse() && MO.isKill()) {
324 for (unsigned j = 0; j < 2; ++j) {
325 // Look at the two new MI's in reverse order.
326 MachineInstr *NewMI = NewMIs[j];
327 if (!NewMI->readsRegister(Reg))
329 LV->addVirtualRegisterKilled(Reg, NewMI);
330 if (VI.removeKill(MI))
331 VI.Kills.push_back(NewMI);
339 MFI->insert(MBBI, NewMIs[1]);
340 MFI->insert(MBBI, NewMIs[0]);
345 bool ARMInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
346 MachineBasicBlock *&FBB,
347 SmallVectorImpl<MachineOperand> &Cond,
348 bool AllowModify) const {
349 // If the block has no terminators, it just falls into the block after it.
350 MachineBasicBlock::iterator I = MBB.end();
351 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
354 // Get the last instruction in the block.
355 MachineInstr *LastInst = I;
357 // If there is only one terminator instruction, process it.
358 unsigned LastOpc = LastInst->getOpcode();
359 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
360 if (LastOpc == ARM::B || LastOpc == ARM::tB) {
361 TBB = LastInst->getOperand(0).getMBB();
364 if (LastOpc == ARM::Bcc || LastOpc == ARM::tBcc) {
365 // Block ends with fall-through condbranch.
366 TBB = LastInst->getOperand(0).getMBB();
367 Cond.push_back(LastInst->getOperand(1));
368 Cond.push_back(LastInst->getOperand(2));
371 return true; // Can't handle indirect branch.
374 // Get the instruction before it if it is a terminator.
375 MachineInstr *SecondLastInst = I;
377 // If there are three terminators, we don't know what sort of block this is.
378 if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
381 // If the block ends with ARM::B/ARM::tB and a ARM::Bcc/ARM::tBcc, handle it.
382 unsigned SecondLastOpc = SecondLastInst->getOpcode();
383 if ((SecondLastOpc == ARM::Bcc && LastOpc == ARM::B) ||
384 (SecondLastOpc == ARM::tBcc && LastOpc == ARM::tB)) {
385 TBB = SecondLastInst->getOperand(0).getMBB();
386 Cond.push_back(SecondLastInst->getOperand(1));
387 Cond.push_back(SecondLastInst->getOperand(2));
388 FBB = LastInst->getOperand(0).getMBB();
392 // If the block ends with two unconditional branches, handle it. The second
393 // one is not executed, so remove it.
394 if ((SecondLastOpc == ARM::B || SecondLastOpc==ARM::tB) &&
395 (LastOpc == ARM::B || LastOpc == ARM::tB)) {
396 TBB = SecondLastInst->getOperand(0).getMBB();
399 I->eraseFromParent();
403 // Likewise if it ends with a branch table followed by an unconditional branch.
404 // The branch folder can create these, and we must get rid of them for
405 // correctness of Thumb constant islands.
406 if ((SecondLastOpc == ARM::BR_JTr || SecondLastOpc==ARM::BR_JTm ||
407 SecondLastOpc == ARM::BR_JTadd || SecondLastOpc==ARM::tBR_JTr) &&
408 (LastOpc == ARM::B || LastOpc == ARM::tB)) {
411 I->eraseFromParent();
415 // Otherwise, can't handle this.
420 unsigned ARMInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
421 MachineFunction &MF = *MBB.getParent();
422 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
423 int BOpc = AFI->isThumbFunction() ? ARM::tB : ARM::B;
424 int BccOpc = AFI->isThumbFunction() ? ARM::tBcc : ARM::Bcc;
426 MachineBasicBlock::iterator I = MBB.end();
427 if (I == MBB.begin()) return 0;
429 if (I->getOpcode() != BOpc && I->getOpcode() != BccOpc)
432 // Remove the branch.
433 I->eraseFromParent();
437 if (I == MBB.begin()) return 1;
439 if (I->getOpcode() != BccOpc)
442 // Remove the branch.
443 I->eraseFromParent();
447 unsigned ARMInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
448 MachineBasicBlock *FBB,
449 const SmallVectorImpl<MachineOperand> &Cond) const {
450 MachineFunction &MF = *MBB.getParent();
451 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
452 int BOpc = AFI->isThumbFunction() ? ARM::tB : ARM::B;
453 int BccOpc = AFI->isThumbFunction() ? ARM::tBcc : ARM::Bcc;
455 // Shouldn't be a fall through.
456 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
457 assert((Cond.size() == 2 || Cond.size() == 0) &&
458 "ARM branch conditions have two components!");
461 if (Cond.empty()) // Unconditional branch?
462 BuildMI(&MBB, get(BOpc)).addMBB(TBB);
464 BuildMI(&MBB, get(BccOpc)).addMBB(TBB)
465 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
469 // Two-way conditional branch.
470 BuildMI(&MBB, get(BccOpc)).addMBB(TBB)
471 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
472 BuildMI(&MBB, get(BOpc)).addMBB(FBB);
476 bool ARMInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
477 MachineBasicBlock::iterator I,
478 unsigned DestReg, unsigned SrcReg,
479 const TargetRegisterClass *DestRC,
480 const TargetRegisterClass *SrcRC) const {
481 if (DestRC != SrcRC) {
482 // Not yet supported!
486 DebugLoc DL = DebugLoc::getUnknownLoc();
487 if (I != MBB.end()) DL = I->getDebugLoc();
489 if (DestRC == ARM::GPRRegisterClass) {
490 MachineFunction &MF = *MBB.getParent();
491 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
492 if (AFI->isThumbFunction())
493 BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg).addReg(SrcReg);
495 AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr), DestReg)
497 } else if (DestRC == ARM::SPRRegisterClass)
498 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYS), DestReg)
500 else if (DestRC == ARM::DPRRegisterClass)
501 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYD), DestReg)
509 static const MachineInstrBuilder &ARMInstrAddOperand(MachineInstrBuilder &MIB,
510 MachineOperand &MO) {
512 MIB = MIB.addReg(MO.getReg(), MO.isDef(), MO.isImplicit());
514 MIB = MIB.addImm(MO.getImm());
516 MIB = MIB.addFrameIndex(MO.getIndex());
518 assert(0 && "Unknown operand for ARMInstrAddOperand!");
524 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
525 unsigned SrcReg, bool isKill, int FI,
526 const TargetRegisterClass *RC) const {
527 DebugLoc DL = DebugLoc::getUnknownLoc();
528 if (I != MBB.end()) DL = I->getDebugLoc();
530 if (RC == ARM::GPRRegisterClass) {
531 MachineFunction &MF = *MBB.getParent();
532 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
533 if (AFI->isThumbFunction())
534 BuildMI(MBB, I, DL, get(ARM::tSpill))
535 .addReg(SrcReg, false, false, isKill)
536 .addFrameIndex(FI).addImm(0);
538 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STR))
539 .addReg(SrcReg, false, false, isKill)
540 .addFrameIndex(FI).addReg(0).addImm(0));
541 } else if (RC == ARM::DPRRegisterClass) {
542 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTD))
543 .addReg(SrcReg, false, false, isKill)
544 .addFrameIndex(FI).addImm(0));
546 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
547 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTS))
548 .addReg(SrcReg, false, false, isKill)
549 .addFrameIndex(FI).addImm(0));
553 void ARMInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
555 SmallVectorImpl<MachineOperand> &Addr,
556 const TargetRegisterClass *RC,
557 SmallVectorImpl<MachineInstr*> &NewMIs) const{
559 if (RC == ARM::GPRRegisterClass) {
560 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
561 if (AFI->isThumbFunction()) {
562 Opc = Addr[0].isFI() ? ARM::tSpill : ARM::tSTR;
563 MachineInstrBuilder MIB =
564 BuildMI(MF, get(Opc)).addReg(SrcReg, false, false, isKill);
565 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
566 MIB = ARMInstrAddOperand(MIB, Addr[i]);
567 NewMIs.push_back(MIB);
571 } else if (RC == ARM::DPRRegisterClass) {
574 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
578 MachineInstrBuilder MIB =
579 BuildMI(MF, get(Opc)).addReg(SrcReg, false, false, isKill);
580 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
581 MIB = ARMInstrAddOperand(MIB, Addr[i]);
583 NewMIs.push_back(MIB);
588 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
589 unsigned DestReg, int FI,
590 const TargetRegisterClass *RC) const {
591 DebugLoc DL = DebugLoc::getUnknownLoc();
592 if (I != MBB.end()) DL = I->getDebugLoc();
594 if (RC == ARM::GPRRegisterClass) {
595 MachineFunction &MF = *MBB.getParent();
596 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
597 if (AFI->isThumbFunction())
598 BuildMI(MBB, I, DL, get(ARM::tRestore), DestReg)
599 .addFrameIndex(FI).addImm(0);
601 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::LDR), DestReg)
602 .addFrameIndex(FI).addReg(0).addImm(0));
603 } else if (RC == ARM::DPRRegisterClass) {
604 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDD), DestReg)
605 .addFrameIndex(FI).addImm(0));
607 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
608 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDS), DestReg)
609 .addFrameIndex(FI).addImm(0));
613 void ARMInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
614 SmallVectorImpl<MachineOperand> &Addr,
615 const TargetRegisterClass *RC,
616 SmallVectorImpl<MachineInstr*> &NewMIs) const {
618 if (RC == ARM::GPRRegisterClass) {
619 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
620 if (AFI->isThumbFunction()) {
621 Opc = Addr[0].isFI() ? ARM::tRestore : ARM::tLDR;
622 MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
623 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
624 MIB = ARMInstrAddOperand(MIB, Addr[i]);
625 NewMIs.push_back(MIB);
629 } else if (RC == ARM::DPRRegisterClass) {
632 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
636 MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
637 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
638 MIB = ARMInstrAddOperand(MIB, Addr[i]);
640 NewMIs.push_back(MIB);
644 bool ARMInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
645 MachineBasicBlock::iterator MI,
646 const std::vector<CalleeSavedInfo> &CSI) const {
647 MachineFunction &MF = *MBB.getParent();
648 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
649 if (!AFI->isThumbFunction() || CSI.empty())
652 DebugLoc DL = DebugLoc::getUnknownLoc();
653 if (MI != MBB.end()) DL = MI->getDebugLoc();
655 MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, get(ARM::tPUSH));
656 for (unsigned i = CSI.size(); i != 0; --i) {
657 unsigned Reg = CSI[i-1].getReg();
658 // Add the callee-saved register as live-in. It's killed at the spill.
660 MIB.addReg(Reg, false/*isDef*/,false/*isImp*/,true/*isKill*/);
665 bool ARMInstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
666 MachineBasicBlock::iterator MI,
667 const std::vector<CalleeSavedInfo> &CSI) const {
668 MachineFunction &MF = *MBB.getParent();
669 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
670 if (!AFI->isThumbFunction() || CSI.empty())
673 bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
674 MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
675 MBB.insert(MI, PopMI);
676 for (unsigned i = CSI.size(); i != 0; --i) {
677 unsigned Reg = CSI[i-1].getReg();
678 if (Reg == ARM::LR) {
679 // Special epilogue for vararg functions. See emitEpilogue
683 PopMI->setDesc(get(ARM::tPOP_RET));
686 PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
691 MachineInstr *ARMInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
693 const SmallVectorImpl<unsigned> &Ops,
695 if (Ops.size() != 1) return NULL;
697 unsigned OpNum = Ops[0];
698 unsigned Opc = MI->getOpcode();
699 MachineInstr *NewMI = NULL;
703 if (MI->getOperand(4).getReg() == ARM::CPSR)
704 // If it is updating CPSR, then it cannot be foled.
706 unsigned Pred = MI->getOperand(2).getImm();
707 unsigned PredReg = MI->getOperand(3).getReg();
708 if (OpNum == 0) { // move -> store
709 unsigned SrcReg = MI->getOperand(1).getReg();
710 bool isKill = MI->getOperand(1).isKill();
711 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::STR))
712 .addReg(SrcReg, false, false, isKill)
713 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
714 } else { // move -> load
715 unsigned DstReg = MI->getOperand(0).getReg();
716 bool isDead = MI->getOperand(0).isDead();
717 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::LDR))
718 .addReg(DstReg, true, false, false, isDead)
719 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
724 if (OpNum == 0) { // move -> store
725 unsigned SrcReg = MI->getOperand(1).getReg();
726 bool isKill = MI->getOperand(1).isKill();
727 if (RI.isPhysicalRegister(SrcReg) && !RI.isLowRegister(SrcReg))
728 // tSpill cannot take a high register operand.
730 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
731 .addReg(SrcReg, false, false, isKill)
732 .addFrameIndex(FI).addImm(0);
733 } else { // move -> load
734 unsigned DstReg = MI->getOperand(0).getReg();
735 if (RI.isPhysicalRegister(DstReg) && !RI.isLowRegister(DstReg))
736 // tRestore cannot target a high register operand.
738 bool isDead = MI->getOperand(0).isDead();
739 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
740 .addReg(DstReg, true, false, false, isDead)
741 .addFrameIndex(FI).addImm(0);
746 unsigned Pred = MI->getOperand(2).getImm();
747 unsigned PredReg = MI->getOperand(3).getReg();
748 if (OpNum == 0) { // move -> store
749 unsigned SrcReg = MI->getOperand(1).getReg();
750 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTS))
751 .addReg(SrcReg).addFrameIndex(FI)
752 .addImm(0).addImm(Pred).addReg(PredReg);
753 } else { // move -> load
754 unsigned DstReg = MI->getOperand(0).getReg();
755 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS), DstReg)
757 .addImm(0).addImm(Pred).addReg(PredReg);
762 unsigned Pred = MI->getOperand(2).getImm();
763 unsigned PredReg = MI->getOperand(3).getReg();
764 if (OpNum == 0) { // move -> store
765 unsigned SrcReg = MI->getOperand(1).getReg();
766 bool isKill = MI->getOperand(1).isKill();
767 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTD))
768 .addReg(SrcReg, false, false, isKill)
769 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
770 } else { // move -> load
771 unsigned DstReg = MI->getOperand(0).getReg();
772 bool isDead = MI->getOperand(0).isDead();
773 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDD))
774 .addReg(DstReg, true, false, false, isDead)
775 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
784 bool ARMInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
785 const SmallVectorImpl<unsigned> &Ops) const {
786 if (Ops.size() != 1) return false;
788 unsigned OpNum = Ops[0];
789 unsigned Opc = MI->getOpcode();
793 // If it is updating CPSR, then it cannot be foled.
794 return MI->getOperand(4).getReg() != ARM::CPSR;
796 if (OpNum == 0) { // move -> store
797 unsigned SrcReg = MI->getOperand(1).getReg();
798 if (RI.isPhysicalRegister(SrcReg) && !RI.isLowRegister(SrcReg))
799 // tSpill cannot take a high register operand.
801 } else { // move -> load
802 unsigned DstReg = MI->getOperand(0).getReg();
803 if (RI.isPhysicalRegister(DstReg) && !RI.isLowRegister(DstReg))
804 // tRestore cannot target a high register operand.
817 bool ARMInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
818 if (MBB.empty()) return false;
820 switch (MBB.back().getOpcode()) {
821 case ARM::BX_RET: // Return.
824 case ARM::tBX_RET_vararg:
827 case ARM::tB: // Uncond branch.
829 case ARM::BR_JTr: // Jumptable branch.
830 case ARM::BR_JTm: // Jumptable branch through mem.
831 case ARM::BR_JTadd: // Jumptable branch add to pc.
833 default: return false;
838 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
839 ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
840 Cond[0].setImm(ARMCC::getOppositeCondition(CC));
844 bool ARMInstrInfo::isPredicated(const MachineInstr *MI) const {
845 int PIdx = MI->findFirstPredOperandIdx();
846 return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL;
849 bool ARMInstrInfo::PredicateInstruction(MachineInstr *MI,
850 const SmallVectorImpl<MachineOperand> &Pred) const {
851 unsigned Opc = MI->getOpcode();
852 if (Opc == ARM::B || Opc == ARM::tB) {
853 MI->setDesc(get(Opc == ARM::B ? ARM::Bcc : ARM::tBcc));
854 MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
855 MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
859 int PIdx = MI->findFirstPredOperandIdx();
861 MachineOperand &PMO = MI->getOperand(PIdx);
862 PMO.setImm(Pred[0].getImm());
863 MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
870 ARMInstrInfo::SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
871 const SmallVectorImpl<MachineOperand> &Pred2) const{
872 if (Pred1.size() > 2 || Pred2.size() > 2)
875 ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
876 ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
886 return CC2 == ARMCC::HI;
888 return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
890 return CC2 == ARMCC::GT;
892 return CC2 == ARMCC::LT;
896 bool ARMInstrInfo::DefinesPredicate(MachineInstr *MI,
897 std::vector<MachineOperand> &Pred) const {
898 const TargetInstrDesc &TID = MI->getDesc();
899 if (!TID.getImplicitDefs() && !TID.hasOptionalDef())
903 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
904 const MachineOperand &MO = MI->getOperand(i);
905 if (MO.isReg() && MO.getReg() == ARM::CPSR) {
915 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing
916 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
917 unsigned JTI) DISABLE_INLINE;
918 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
920 return JT[JTI].MBBs.size();
923 /// GetInstSize - Return the size of the specified MachineInstr.
925 unsigned ARMInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
926 const MachineBasicBlock &MBB = *MI->getParent();
927 const MachineFunction *MF = MBB.getParent();
928 const TargetAsmInfo *TAI = MF->getTarget().getTargetAsmInfo();
930 // Basic size info comes from the TSFlags field.
931 const TargetInstrDesc &TID = MI->getDesc();
932 unsigned TSFlags = TID.TSFlags;
934 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
936 // If this machine instr is an inline asm, measure it.
937 if (MI->getOpcode() == ARM::INLINEASM)
938 return TAI->getInlineAsmLength(MI->getOperand(0).getSymbolName());
941 switch (MI->getOpcode()) {
943 assert(0 && "Unknown or unset size field for instr!");
945 case TargetInstrInfo::IMPLICIT_DEF:
946 case TargetInstrInfo::DECLARE:
947 case TargetInstrInfo::DBG_LABEL:
948 case TargetInstrInfo::EH_LABEL:
953 case ARMII::Size8Bytes: return 8; // Arm instruction x 2.
954 case ARMII::Size4Bytes: return 4; // Arm instruction.
955 case ARMII::Size2Bytes: return 2; // Thumb instruction.
956 case ARMII::SizeSpecial: {
957 switch (MI->getOpcode()) {
958 case ARM::CONSTPOOL_ENTRY:
959 // If this machine instr is a constant pool entry, its size is recorded as
961 return MI->getOperand(2).getImm();
966 // These are jumptable branches, i.e. a branch followed by an inlined
967 // jumptable. The size is 4 + 4 * number of entries.
968 unsigned NumOps = TID.getNumOperands();
969 MachineOperand JTOP =
970 MI->getOperand(NumOps - (TID.isPredicable() ? 3 : 2));
971 unsigned JTI = JTOP.getIndex();
972 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
973 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
974 assert(JTI < JT.size());
975 // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
976 // 4 aligned. The assembler / linker may add 2 byte padding just before
977 // the JT entries. The size does not include this padding; the
978 // constant islands pass does separate bookkeeping for it.
979 // FIXME: If we know the size of the function is less than (1 << 16) *2
980 // bytes, we can use 16-bit entries instead. Then there won't be an
982 return getNumJTEntries(JT, JTI) * 4 +
983 (MI->getOpcode()==ARM::tBR_JTr ? 2 : 4);
986 // Otherwise, pseudo-instruction sizes are zero.
991 return 0; // Not reached