diff options
| -rw-r--r-- | lib/CodeGen/UnreachableBlockElim.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/UnreachableBlockElim.cpp b/lib/CodeGen/UnreachableBlockElim.cpp index 6dd333358b..ebf1129d55 100644 --- a/lib/CodeGen/UnreachableBlockElim.cpp +++ b/lib/CodeGen/UnreachableBlockElim.cpp @@ -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); } |