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UnreachableBlockElim could incorrectly return false when it had not modified the CFG, but HAD modified some PHI nodes. Fixes PR8174.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115083 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-09-29 20:57:19 +00:00
parent 36c4debc94
commit b0725316cd
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/UnreachableBlockElim.cpp
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@ -118,6 +118,7 @@ void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
SmallPtrSet<MachineBasicBlock*, 8> Reachable;
bool ModifiedPHI = false;
MMI = getAnalysisIfAvailable<MachineModuleInfo>();
MachineDominatorTree *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
@ -179,6 +180,7 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
ModifiedPHI = true;
}
if (phi->getNumOperands() == 3) {
@ -188,6 +190,7 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
MachineInstr* temp = phi;
++phi;
temp->eraseFromParent();
ModifiedPHI = true;
if (Input != Output)
F.getRegInfo().replaceRegWith(Output, Input);
@ -201,5 +204,5 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
F.RenumberBlocks();
return DeadBlocks.size();
return (DeadBlocks.size() || ModifiedPHI);
}