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Reduce the entries in a phi before testing it for deadness, because removing the entries might make it dead.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54535 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2008-08-08 18:00:05 +00:00
parent 42ccc21ce7
commit b12ab97bbd
1 changed files with 7 additions and 7 deletions
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12
lib/CodeGen/UnreachableBlockElim.cpp
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@@ -152,6 +152,12 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
MachineBasicBlock::iterator phi = BB->begin(); MachineBasicBlock::iterator phi = BB->begin();
while (phi != BB->end() && while (phi != BB->end() &&
phi->getOpcode() == TargetInstrInfo::PHI) { phi->getOpcode() == TargetInstrInfo::PHI) {
for (unsigned i = phi->getNumOperands() - 1; i >= 2; i-=2)
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
}
if (phi->getNumOperands() == 3) { if (phi->getNumOperands() == 3) {
unsigned Input = phi->getOperand(1).getReg(); unsigned Input = phi->getOperand(1).getReg();
unsigned Output = phi->getOperand(0).getReg(); unsigned Output = phi->getOperand(0).getReg();
@@ -166,12 +172,6 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
continue; continue;
} }
for (unsigned i = phi->getNumOperands() - 1; i >= 2; i-=2)
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
}
++phi; ++phi;
} }
} }