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Reduce the entries in a phi before testing it for deadness, because removing the entries might make it dead.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54535 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -152,6 +152,12 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
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MachineBasicBlock::iterator phi = BB->begin();
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while (phi != BB->end() &&
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phi->getOpcode() == TargetInstrInfo::PHI) {
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for (unsigned i = phi->getNumOperands() - 1; i >= 2; i-=2)
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if (!preds.count(phi->getOperand(i).getMBB())) {
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phi->RemoveOperand(i);
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phi->RemoveOperand(i-1);
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}
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if (phi->getNumOperands() == 3) {
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unsigned Input = phi->getOperand(1).getReg();
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unsigned Output = phi->getOperand(0).getReg();
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@ -166,12 +172,6 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
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continue;
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}
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for (unsigned i = phi->getNumOperands() - 1; i >= 2; i-=2)
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if (!preds.count(phi->getOperand(i).getMBB())) {
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phi->RemoveOperand(i);
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phi->RemoveOperand(i-1);
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}
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++phi;
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}
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}
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