181     MachineBasicBlock::iterator phi = BB->begin();  in runOnMachineFunction()  local
182     while (phi != BB->end() && phi->isPHI()) {  in runOnMachineFunction()
183       for (unsigned i = phi->getNumOperands() - 1; i >= 2; i-=2)  in runOnMachineFunction()
184         if (!preds.count(phi->getOperand(i).getMBB())) {  in runOnMachineFunction()
185           phi->RemoveOperand(i);  in runOnMachineFunction()
186           phi->RemoveOperand(i-1);  in runOnMachineFunction()
190       if (phi->getNumOperands() == 3) {  in runOnMachineFunction()
191         unsigned Input = phi->getOperand(1).getReg();  in runOnMachineFunction()
192         unsigned Output = phi->getOperand(0).getReg();  in runOnMachineFunction()
194         MachineInstr* temp = phi;  in runOnMachineFunction()
195         ++phi;  in runOnMachineFunction()
208       ++phi;  in runOnMachineFunction()