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We don't need to insert copies for implicit_def's.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56674 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -420,7 +420,6 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
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while (P != MBB->end() && P->getOpcode() == TargetInstrInfo::PHI) {
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while (P != MBB->end() && P->getOpcode() == TargetInstrInfo::PHI) {
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unsigned DestReg = P->getOperand(0).getReg();
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unsigned DestReg = P->getOperand(0).getReg();
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// Don't both doing PHI elimination for dead PHI's.
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// Don't both doing PHI elimination for dead PHI's.
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if (P->registerDefIsDead(DestReg)) {
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if (P->registerDefIsDead(DestReg)) {
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++P;
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++P;
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@ -449,6 +448,11 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
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continue;
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continue;
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}
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}
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// We don't need to insert copies for implicit_defs.
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MachineInstr* DefMI = MRI.getVRegDef(SrcReg);
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if (DefMI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF)
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ProcessedNames.insert(SrcReg);
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// Check for trivial interferences via liveness information, allowing us
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// Check for trivial interferences via liveness information, allowing us
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// to avoid extra work later. Any registers that interfere cannot both
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// to avoid extra work later. Any registers that interfere cannot both
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// be in the renaming set, so choose one and add copies for it instead.
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// be in the renaming set, so choose one and add copies for it instead.
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