70       MachineInstr *LastUse;    // Last instr to use reg.  member
77         : LastUse(nullptr), VirtReg(v), PhysReg(0), LastOpNum(0), Dirty(false){}  in LiveReg()
238   if (!LR.LastUse) return;  in addKillFlag()
239   MachineOperand &MO = LR.LastUse->getOperand(LR.LastOpNum);  in addKillFlag()
240   if (MO.isUse() && !LR.LastUse->isRegTiedToDefOperand(LR.LastOpNum)) {  in addKillFlag()
244       LR.LastUse->addRegisterKilled(LR.PhysReg, TRI, true);  in addKillFlag()
287     bool SpillKill = MachineBasicBlock::iterator(LR.LastUse) != MI;  in spillVirtReg()
326       LR.LastUse = nullptr; // Don't kill register again  in spillVirtReg()
617   } else if (LRI->LastUse) {  in defineVirtReg()
620     if (LRI->LastUse != &MI || LRI->LastUse->getOperand(LRI->LastOpNum).isUse())  in defineVirtReg()
624   LRI->LastUse = &MI;  in defineVirtReg()
676   LRI->LastUse = &MI;  in reloadVirtReg()