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Make LiveVariables even more optional, by making it optional in the call to TargetInstrInfo::convertToThreeAddressInstruction

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Also, if LV isn't around, then TwoAddr doesn't need to be updating flags, since they won't have been set in the first place.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53058 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2008-07-02 23:41:07 +00:00
parent cd920d9ecf
commit f660c171c8
6 changed files with 31 additions and 71 deletions
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47
lib/CodeGen/TwoAddressInstructionPass.cpp
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@@ -378,27 +378,6 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
if (LV) {
// Update live variables
LV->instructionChanged(mi, NewMI);
} else {
// Update flags manually
for (unsigned i = 0, e = mi->getNumOperands();
i != e; ++i) {
MachineOperand &MO = mi->getOperand(i);
if (MO.isRegister() && MO.getReg() &&
TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
unsigned Reg = MO.getReg();
if (MO.isDef()) {
if (MO.isDead()) {
MO.setIsDead(false);
NewMI->addRegisterDead(Reg, TRI);
}
}
if (MO.isKill()) {
MO.setIsKill(false);
NewMI->addRegisterKilled(Reg, TRI);
}
}
}
}
mbbi->insert(mi, NewMI); // Insert the new inst
@@ -424,7 +403,7 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
assert(TID.getOperandConstraint(i, TOI::TIED_TO) == -1);
#endif
MachineInstr *NewMI = TII->convertToThreeAddress(mbbi, mi, *LV);
MachineInstr *NewMI = TII->convertToThreeAddress(mbbi, mi, LV);
if (NewMI) {
DOUT << "2addr: CONVERTING 2-ADDR: " << *mi;
DOUT << "2addr: TO 3-ADDR: " << *NewMI;
@@ -481,30 +460,6 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
if (LV->removeVirtualRegisterDead(regB, mbbi, mi))
LV->addVirtualRegisterDead(regB, prevMi);
} else {
// Manually update kill/dead flags.
bool RemovedKill = false;
bool RemovedDead = false;
for (unsigned i = 0, e = mi->getNumOperands(); i != e; ++i) {
MachineOperand &MO = mi->getOperand(i);
if (MO.isRegister() && MO.isKill() && MO.getReg() == regB) {
MO.setIsKill(false);
RemovedKill = true;
break;
}
if (MO.isRegister() && MO.isDef() && MO.getReg() == regB) {
MO.setIsDead(false);
RemovedDead = true;
}
if (RemovedKill && RemovedDead) break;
}
if (RemovedKill)
prevMi->addRegisterKilled(regB, TRI);
if (RemovedDead)
prevMi->addRegisterDead(regB, TRI);
}
// Replace all occurences of regB with regA.