lib/CodeGen/RegisterCoalescer.cpp

738     MachineOperand &UseMO = *UI;
740     if (UseMO.isUndef())
742     MachineInstr *UseMI = UseMO.getParent();
746       UseMO.setReg(NewReg);
755     UseMO.setIsKill(false);
757       UseMO.substPhysReg(NewReg, *TRI);
759       UseMO.setReg(NewReg);
1068     for (MachineOperand &UseMO : MRI->use_operands(SrcReg)) {
1069       MachineInstr *UseMI = UseMO.getParent();
1071         UseMO.setReg(DstReg);