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We don't need to insert copies for implicit_def's.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56674 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-09-26 18:50:46 +00:00
parent 0eecd899ea
commit 082d351361
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/StrongPHIElimination.cpp
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@ -419,7 +419,6 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
MachineBasicBlock::iterator P = MBB->begin();
while (P != MBB->end() && P->getOpcode() == TargetInstrInfo::PHI) {
unsigned DestReg = P->getOperand(0).getReg();
// Don't both doing PHI elimination for dead PHI's.
if (P->registerDefIsDead(DestReg)) {
@ -448,6 +447,11 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
ProcessedNames.insert(SrcReg);
continue;
}
// We don't need to insert copies for implicit_defs.
MachineInstr* DefMI = MRI.getVRegDef(SrcReg);
if (DefMI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF)
ProcessedNames.insert(SrcReg);
// Check for trivial interferences via liveness information, allowing us
// to avoid extra work later. Any registers that interfere cannot both