MachineFunction::iterator &mbbi,
unsigned RegB, unsigned RegC, unsigned Dist);
- bool isProfitableToConv3Addr(unsigned RegA);
+ bool isProfitableToConv3Addr(unsigned RegA, unsigned RegB);
bool ConvertInstTo3Addr(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
- unsigned RegB, unsigned Dist);
+ unsigned RegA, unsigned RegB, unsigned Dist);
typedef std::pair<std::pair<unsigned, bool>, MachineInstr*> NewKill;
bool canUpdateDeletedKills(SmallVector<unsigned, 4> &Kills,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
unsigned SrcIdx, unsigned DstIdx,
- unsigned Dist);
+ unsigned Dist,
+ SmallPtrSet<MachineInstr*, 8> &Processed);
+
+ void ScanUses(unsigned DstReg, MachineBasicBlock *MBB,
+ SmallPtrSet<MachineInstr*, 8> &Processed);
void ProcessCopy(MachineInstr *MI, MachineBasicBlock *MBB,
SmallPtrSet<MachineInstr*, 8> &Processed);
AU.addPreserved<LiveVariables>();
AU.addPreservedID(MachineLoopInfoID);
AU.addPreservedID(MachineDominatorsID);
- AU.addPreservedID(StrongPHIEliminationID);
AU.addPreservedID(PHIEliminationID);
MachineFunctionPass::getAnalysisUsage(AU);
}
/// isTwoAddrUse - Return true if the specified MI is using the specified
/// register as a two-address operand.
static bool isTwoAddrUse(MachineInstr *UseMI, unsigned Reg) {
- const TargetInstrDesc &TID = UseMI->getDesc();
- for (unsigned i = 0, e = TID.getNumOperands(); i != e; ++i) {
+ const MCInstrDesc &MCID = UseMI->getDesc();
+ for (unsigned i = 0, e = MCID.getNumOperands(); i != e; ++i) {
MachineOperand &MO = UseMI->getOperand(i);
if (MO.isReg() && MO.getReg() == Reg &&
(MO.isDef() || UseMI->isRegTiedToDefOperand(i)))
/// isTwoAddrUse - Return true if the specified MI uses the specified register
/// as a two-address use. If so, return the destination register by reference.
static bool isTwoAddrUse(MachineInstr &MI, unsigned Reg, unsigned &DstReg) {
- const TargetInstrDesc &TID = MI.getDesc();
- unsigned NumOps = MI.isInlineAsm() ? MI.getNumOperands():TID.getNumOperands();
+ const MCInstrDesc &MCID = MI.getDesc();
+ unsigned NumOps = MI.isInlineAsm()
+ ? MI.getNumOperands() : MCID.getNumOperands();
for (unsigned i = 0; i != NumOps; ++i) {
const MachineOperand &MO = MI.getOperand(i);
if (!MO.isReg() || !MO.isUse() || MO.getReg() != Reg)
unsigned FromRegC = getMappedReg(regC, SrcRegMap);
unsigned ToRegB = getMappedReg(regB, DstRegMap);
unsigned ToRegC = getMappedReg(regC, DstRegMap);
- if (!regsAreCompatible(FromRegB, ToRegB, TRI) &&
+ if ((FromRegB && ToRegB && !regsAreCompatible(FromRegB, ToRegB, TRI)) &&
((!FromRegC && !ToRegC) ||
regsAreCompatible(FromRegB, ToRegC, TRI) ||
regsAreCompatible(FromRegC, ToRegB, TRI)))
/// isProfitableToConv3Addr - Return true if it is profitable to convert the
/// given 2-address instruction to a 3-address one.
bool
-TwoAddressInstructionPass::isProfitableToConv3Addr(unsigned RegA) {
+TwoAddressInstructionPass::isProfitableToConv3Addr(unsigned RegA,unsigned RegB){
// Look for situations like this:
// %reg1024<def> = MOV r1
// %reg1025<def> = MOV r0
// %reg1026<def> = ADD %reg1024, %reg1025
// r2 = MOV %reg1026
// Turn ADD into a 3-address instruction to avoid a copy.
- unsigned FromRegA = getMappedReg(RegA, SrcRegMap);
+ unsigned FromRegB = getMappedReg(RegB, SrcRegMap);
+ if (!FromRegB)
+ return false;
unsigned ToRegA = getMappedReg(RegA, DstRegMap);
- return (FromRegA && ToRegA && !regsAreCompatible(FromRegA, ToRegA, TRI));
+ return (ToRegA && !regsAreCompatible(FromRegB, ToRegA, TRI));
}
/// ConvertInstTo3Addr - Convert the specified two-address instruction into a
TwoAddressInstructionPass::ConvertInstTo3Addr(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
- unsigned RegB, unsigned Dist) {
+ unsigned RegA, unsigned RegB,
+ unsigned Dist) {
MachineInstr *NewMI = TII->convertToThreeAddress(mbbi, mi, LV);
if (NewMI) {
DEBUG(dbgs() << "2addr: CONVERTING 2-ADDR: " << *mi);
mi = NewMI;
nmi = llvm::next(mi);
}
+
+ // Update source and destination register maps.
+ SrcRegMap.erase(RegA);
+ DstRegMap.erase(RegB);
return true;
}
return false;
}
+/// ScanUses - Scan forward recursively for only uses, update maps if the use
+/// is a copy or a two-address instruction.
+void
+TwoAddressInstructionPass::ScanUses(unsigned DstReg, MachineBasicBlock *MBB,
+ SmallPtrSet<MachineInstr*, 8> &Processed) {
+ SmallVector<unsigned, 4> VirtRegPairs;
+ bool IsDstPhys;
+ bool IsCopy = false;
+ unsigned NewReg = 0;
+ unsigned Reg = DstReg;
+ while (MachineInstr *UseMI = findOnlyInterestingUse(Reg, MBB, MRI, TII,IsCopy,
+ NewReg, IsDstPhys)) {
+ if (IsCopy && !Processed.insert(UseMI))
+ break;
+
+ DenseMap<MachineInstr*, unsigned>::iterator DI = DistanceMap.find(UseMI);
+ if (DI != DistanceMap.end())
+ // Earlier in the same MBB.Reached via a back edge.
+ break;
+
+ if (IsDstPhys) {
+ VirtRegPairs.push_back(NewReg);
+ break;
+ }
+ bool isNew = SrcRegMap.insert(std::make_pair(NewReg, Reg)).second;
+ if (!isNew)
+ assert(SrcRegMap[NewReg] == Reg && "Can't map to two src registers!");
+ VirtRegPairs.push_back(NewReg);
+ Reg = NewReg;
+ }
+
+ if (!VirtRegPairs.empty()) {
+ unsigned ToReg = VirtRegPairs.back();
+ VirtRegPairs.pop_back();
+ while (!VirtRegPairs.empty()) {
+ unsigned FromReg = VirtRegPairs.back();
+ VirtRegPairs.pop_back();
+ bool isNew = DstRegMap.insert(std::make_pair(FromReg, ToReg)).second;
+ if (!isNew)
+ assert(DstRegMap[FromReg] == ToReg &&"Can't map to two dst registers!");
+ ToReg = FromReg;
+ }
+ bool isNew = DstRegMap.insert(std::make_pair(DstReg, ToReg)).second;
+ if (!isNew)
+ assert(DstRegMap[DstReg] == ToReg && "Can't map to two dst registers!");
+ }
+}
+
/// ProcessCopy - If the specified instruction is not yet processed, process it
/// if it's a copy. For a copy instruction, we find the physical registers the
/// source and destination registers might be mapped to. These are kept in
assert(SrcRegMap[DstReg] == SrcReg &&
"Can't map to two src physical registers!");
- SmallVector<unsigned, 4> VirtRegPairs;
- bool IsCopy = false;
- unsigned NewReg = 0;
- while (MachineInstr *UseMI = findOnlyInterestingUse(DstReg, MBB, MRI,TII,
- IsCopy, NewReg, IsDstPhys)) {
- if (IsCopy) {
- if (!Processed.insert(UseMI))
- break;
- }
-
- DenseMap<MachineInstr*, unsigned>::iterator DI = DistanceMap.find(UseMI);
- if (DI != DistanceMap.end())
- // Earlier in the same MBB.Reached via a back edge.
- break;
-
- if (IsDstPhys) {
- VirtRegPairs.push_back(NewReg);
- break;
- }
- bool isNew = SrcRegMap.insert(std::make_pair(NewReg, DstReg)).second;
- if (!isNew)
- assert(SrcRegMap[NewReg] == DstReg &&
- "Can't map to two src physical registers!");
- VirtRegPairs.push_back(NewReg);
- DstReg = NewReg;
- }
-
- if (!VirtRegPairs.empty()) {
- unsigned ToReg = VirtRegPairs.back();
- VirtRegPairs.pop_back();
- while (!VirtRegPairs.empty()) {
- unsigned FromReg = VirtRegPairs.back();
- VirtRegPairs.pop_back();
- bool isNew = DstRegMap.insert(std::make_pair(FromReg, ToReg)).second;
- if (!isNew)
- assert(DstRegMap[FromReg] == ToReg &&
- "Can't map to two dst physical registers!");
- ToReg = FromReg;
- }
- }
+ ScanUses(DstReg, MBB, Processed);
}
Processed.insert(MI);
+ return;
}
/// isSafeToDelete - If the specified instruction does not produce any side
static bool isSafeToDelete(MachineInstr *MI,
const TargetInstrInfo *TII,
SmallVector<unsigned, 4> &Kills) {
- const TargetInstrDesc &TID = MI->getDesc();
- if (TID.mayStore() || TID.isCall())
+ const MCInstrDesc &MCID = MI->getDesc();
+ if (MCID.mayStore() || MCID.isCall())
return false;
- if (TID.isTerminator() || TID.hasUnmodeledSideEffects())
+ if (MCID.isTerminator() || MI->hasUnmodeledSideEffects())
return false;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
TryInstructionTransform(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
- unsigned SrcIdx, unsigned DstIdx, unsigned Dist) {
- const TargetInstrDesc &TID = mi->getDesc();
+ unsigned SrcIdx, unsigned DstIdx, unsigned Dist,
+ SmallPtrSet<MachineInstr*, 8> &Processed) {
+ const MCInstrDesc &MCID = mi->getDesc();
unsigned regA = mi->getOperand(DstIdx).getReg();
unsigned regB = mi->getOperand(SrcIdx).getReg();
unsigned regCIdx = ~0U;
bool TryCommute = false;
bool AggressiveCommute = false;
- if (TID.isCommutable() && mi->getNumOperands() >= 3 &&
+ if (MCID.isCommutable() && mi->getNumOperands() >= 3 &&
TII->findCommutedOpIndices(mi, SrcOp1, SrcOp2)) {
if (SrcIdx == SrcOp1)
regCIdx = SrcOp2;
return false;
}
- if (TID.isConvertibleTo3Addr()) {
+ if (TargetRegisterInfo::isVirtualRegister(regA))
+ ScanUses(regA, &*mbbi, Processed);
+
+ if (MCID.isConvertibleTo3Addr()) {
// This instruction is potentially convertible to a true
// three-address instruction. Check if it is profitable.
- if (!regBKilled || isProfitableToConv3Addr(regA)) {
+ if (!regBKilled || isProfitableToConv3Addr(regA, regB)) {
// Try to convert it.
- if (ConvertInstTo3Addr(mi, nmi, mbbi, regB, Dist)) {
+ if (ConvertInstTo3Addr(mi, nmi, mbbi, regA, regB, Dist)) {
++NumConvertedTo3Addr;
return true; // Done with this instruction.
}
// movq (%rax), %rcx
// addq %rdx, %rcx
// because it's preferable to schedule a load than a register copy.
- if (TID.mayLoad() && !regBKilled) {
+ if (MCID.mayLoad() && !regBKilled) {
// Determine if a load can be unfolded.
unsigned LoadRegIndex;
unsigned NewOpc =
/*UnfoldStore=*/false,
&LoadRegIndex);
if (NewOpc != 0) {
- const TargetInstrDesc &UnfoldTID = TII->get(NewOpc);
- if (UnfoldTID.getNumDefs() == 1) {
+ const MCInstrDesc &UnfoldMCID = TII->get(NewOpc);
+ if (UnfoldMCID.getNumDefs() == 1) {
MachineFunction &MF = *mbbi->getParent();
// Unfold the load.
DEBUG(dbgs() << "2addr: UNFOLDING: " << *mi);
const TargetRegisterClass *RC =
- UnfoldTID.OpInfo[LoadRegIndex].getRegClass(TRI);
+ TII->getRegClass(UnfoldMCID, LoadRegIndex, TRI);
unsigned Reg = MRI->createVirtualRegister(RC);
SmallVector<MachineInstr *, 2> NewMIs;
if (!TII->unfoldMemoryOperand(MF, mi, Reg,
MachineBasicBlock::iterator NewMI = NewMIs[1];
bool TransformSuccess =
TryInstructionTransform(NewMI, mi, mbbi,
- NewSrcIdx, NewDstIdx, Dist);
+ NewSrcIdx, NewDstIdx, Dist, Processed);
if (TransformSuccess ||
NewMIs[1]->getOperand(NewSrcIdx).isKill()) {
// Success, or at least we made an improvement. Keep the unfolded
if (LV) {
for (unsigned i = 0, e = mi->getNumOperands(); i != e; ++i) {
MachineOperand &MO = mi->getOperand(i);
- if (MO.isReg() && MO.getReg() != 0 &&
+ if (MO.isReg() &&
TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
if (MO.isUse()) {
if (MO.isKill()) {
<< MF.getFunction()->getName() << '\n');
// ReMatRegs - Keep track of the registers whose def's are remat'ed.
- BitVector ReMatRegs;
- ReMatRegs.resize(MRI->getLastVirtReg()+1);
+ BitVector ReMatRegs(MRI->getNumVirtRegs());
typedef DenseMap<unsigned, SmallVector<std::pair<unsigned, unsigned>, 4> >
TiedOperandMap;
if (mi->isRegSequence())
RegSequences.push_back(&*mi);
- const TargetInstrDesc &TID = mi->getDesc();
+ const MCInstrDesc &MCID = mi->getDesc();
bool FirstTied = true;
DistanceMap.insert(std::make_pair(mi, ++Dist));
// First scan through all the tied register uses in this instruction
// and record a list of pairs of tied operands for each register.
unsigned NumOps = mi->isInlineAsm()
- ? mi->getNumOperands() : TID.getNumOperands();
+ ? mi->getNumOperands() : MCID.getNumOperands();
for (unsigned SrcIdx = 0; SrcIdx < NumOps; ++SrcIdx) {
unsigned DstIdx = 0;
if (!mi->isRegTiedToDefOperand(SrcIdx, &DstIdx))
"two address instruction invalid");
unsigned regB = mi->getOperand(SrcIdx).getReg();
- TiedOperandMap::iterator OI = TiedOperands.find(regB);
- if (OI == TiedOperands.end()) {
- SmallVector<std::pair<unsigned, unsigned>, 4> TiedPair;
- OI = TiedOperands.insert(std::make_pair(regB, TiedPair)).first;
- }
- OI->second.push_back(std::make_pair(SrcIdx, DstIdx));
+ TiedOperands[regB].push_back(std::make_pair(SrcIdx, DstIdx));
}
// Now iterate over the information collected above.
mi->getOperand(DstIdx).getReg())
break; // Done with this instruction.
- if (TryInstructionTransform(mi, nmi, mbbi, SrcIdx, DstIdx, Dist))
+ if (TryInstructionTransform(mi, nmi, mbbi, SrcIdx, DstIdx, Dist,
+ Processed))
break; // The tied operands have been eliminated.
}
+ bool IsEarlyClobber = false;
bool RemovedKillFlag = false;
bool AllUsesCopied = true;
unsigned LastCopiedReg = 0;
for (unsigned tpi = 0, tpe = TiedPairs.size(); tpi != tpe; ++tpi) {
unsigned SrcIdx = TiedPairs[tpi].first;
unsigned DstIdx = TiedPairs[tpi].second;
- unsigned regA = mi->getOperand(DstIdx).getReg();
+
+ const MachineOperand &DstMO = mi->getOperand(DstIdx);
+ unsigned regA = DstMO.getReg();
+ IsEarlyClobber |= DstMO.isEarlyClobber();
+
// Grab regB from the instruction because it may have changed if the
// instruction was commuted.
regB = mi->getOperand(SrcIdx).getReg();
DEBUG(dbgs() << "2addr: REMATTING : " << *DefMI << "\n");
unsigned regASubIdx = mi->getOperand(DstIdx).getSubReg();
TII->reMaterialize(*mbbi, mi, regA, regASubIdx, DefMI, *TRI);
- ReMatRegs.set(regB);
+ ReMatRegs.set(TargetRegisterInfo::virtReg2Index(regB));
++NumReMats;
} else {
BuildMI(*mbbi, mi, mi->getDebugLoc(), TII->get(TargetOpcode::COPY),
}
if (AllUsesCopied) {
- // Replace other (un-tied) uses of regB with LastCopiedReg.
- for (unsigned i = 0, e = mi->getNumOperands(); i != e; ++i) {
- MachineOperand &MO = mi->getOperand(i);
- if (MO.isReg() && MO.getReg() == regB && MO.isUse()) {
- if (MO.isKill()) {
- MO.setIsKill(false);
- RemovedKillFlag = true;
+ if (!IsEarlyClobber) {
+ // Replace other (un-tied) uses of regB with LastCopiedReg.
+ for (unsigned i = 0, e = mi->getNumOperands(); i != e; ++i) {
+ MachineOperand &MO = mi->getOperand(i);
+ if (MO.isReg() && MO.getReg() == regB && MO.isUse()) {
+ if (MO.isKill()) {
+ MO.setIsKill(false);
+ RemovedKillFlag = true;
+ }
+ MO.setReg(LastCopiedReg);
}
- MO.setReg(LastCopiedReg);
}
}
}
// Some remat'ed instructions are dead.
- int VReg = ReMatRegs.find_first();
- while (VReg != -1) {
+ for (int i = ReMatRegs.find_first(); i != -1; i = ReMatRegs.find_next(i)) {
+ unsigned VReg = TargetRegisterInfo::index2VirtReg(i);
if (MRI->use_nodbg_empty(VReg)) {
MachineInstr *DefMI = MRI->getVRegDef(VReg);
DefMI->eraseFromParent();
}
- VReg = ReMatRegs.find_next(VReg);
}
// Eliminate REG_SEQUENCE instructions. Their whole purpose was to preseve