bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
SmallPtrSet<MachineBasicBlock*, 8> Reachable;
+ bool ModifiedPHI = false;
MMI = getAnalysisIfAvailable<MachineModuleInfo>();
MachineDominatorTree *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
+ ModifiedPHI = true;
}
if (phi->getNumOperands() == 3) {
MachineInstr* temp = phi;
++phi;
temp->eraseFromParent();
+ ModifiedPHI = true;
if (Input != Output)
F.getRegInfo().replaceRegWith(Output, Input);
F.RenumberBlocks();
- return DeadBlocks.size();
+ return (DeadBlocks.size() || ModifiedPHI);
}