virtual bool runOnFunction(Function &F);
public:
static char ID; // Pass identification, replacement for typeid
- UnreachableBlockElim() : FunctionPass(&ID) {}
+ UnreachableBlockElim() : FunctionPass(ID) {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<ProfileInfo>();
};
}
char UnreachableBlockElim::ID = 0;
-static RegisterPass<UnreachableBlockElim>
-X("unreachableblockelim", "Remove unreachable blocks from the CFG");
+INITIALIZE_PASS(UnreachableBlockElim, "unreachableblockelim",
+ "Remove unreachable blocks from the CFG", false, false);
FunctionPass *llvm::createUnreachableBlockEliminationPass() {
return new UnreachableBlockElim();
MachineModuleInfo *MMI;
public:
static char ID; // Pass identification, replacement for typeid
- UnreachableMachineBlockElim() : MachineFunctionPass(&ID) {}
+ UnreachableMachineBlockElim() : MachineFunctionPass(ID) {}
};
}
char UnreachableMachineBlockElim::ID = 0;
-static RegisterPass<UnreachableMachineBlockElim>
-Y("unreachable-mbb-elimination",
- "Remove unreachable machine basic blocks");
+INITIALIZE_PASS(UnreachableMachineBlockElim, "unreachable-mbb-elimination",
+ "Remove unreachable machine basic blocks", false, false);
-const PassInfo *const llvm::UnreachableMachineBlockElimID = &Y;
+char &llvm::UnreachableMachineBlockElimID = UnreachableMachineBlockElim::ID;
void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<MachineLoopInfo>();
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);
}