// Process each use instruction once.
for (MachineRegisterInfo::use_iterator UI = mri_->use_begin(Reg),
UE = mri_->use_end(); UI != UE; ++UI) {
- MachineInstr *RMI = &*UI;
- MachineBasicBlock *RMBB = RMI->getParent();
- if (RMBB == MBB)
+ if (UI.getOperand().isUndef())
continue;
+ MachineInstr *RMI = &*UI;
if (ModInsts.insert(RMI))
RUses.push_back(RMI);
}