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Incorporated feedback: Check that the implicitly defined operands aren't used
before deleting the instruction. llvm-svn: 51609
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@ -373,6 +373,8 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
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}
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if (EnableReMat) {
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// Check to see if the instructions that we rematerialized are now dead. If
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// they are, expunge them here.
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SmallPtrSet<MachineInstr*, 8>::iterator I = ReMattedInstrs.begin();
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SmallPtrSet<MachineInstr*, 8>::iterator E = ReMattedInstrs.end();
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@ -385,20 +387,17 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
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if (!MO.isRegister())
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continue;
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unsigned MOReg = MO.getReg();
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if (!MOReg)
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continue;
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if (MO.isDef()) {
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if (MO.isImplicit())
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continue;
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if (MRI->use_begin(MOReg) != MRI->use_end()) {
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InstrDead = false;
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break;
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}
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if (!MOReg || !MO.isDef() || (MO.isImplicit() && MO.isDead()))
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continue;
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if (MRI->use_begin(MOReg) != MRI->use_end()) {
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InstrDead = false;
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break;
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}
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}
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if (InstrDead && MI->getNumOperands() > 0)
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if (InstrDead)
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MI->eraseFromParent();
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}
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}
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