397   modifySubRegisterOperandStatus(const DeadLaneDetector &DLD,
403   bool isUndefInput(const DeadLaneDetector &DLD, const MachineOperand &MO,
424 bool DetectDeadLanes::isUndefInput(const DeadLaneDetector &DLD,  in isUndefInput()  argument
437   if (!DLD.isDefinedByCopy(DefRegIdx))  in isUndefInput()
440   const DeadLaneDetector::VRegInfo &DefRegInfo = DLD.getVRegInfo(DefRegIdx);  in isUndefInput()
441   LaneBitmask UsedLanes = DLD.transferUsedLanes(MI, DefRegInfo.UsedLanes, MO);  in isUndefInput()
496 DetectDeadLanes::modifySubRegisterOperandStatus(const DeadLaneDetector &DLD,  in modifySubRegisterOperandStatus()  argument
510         const DeadLaneDetector::VRegInfo &RegInfo = DLD.getVRegInfo(RegIdx);  in modifySubRegisterOperandStatus()
524           } else if (isUndefInput(DLD, MO, &CrossCopy)) {  in modifySubRegisterOperandStatus()
554   DeadLaneDetector DLD(MRI, TRI);  in runOnMachineFunction()  local
559     DLD.computeSubRegisterLaneBitInfo();  in runOnMachineFunction()
561     std::tie(LocalChanged, Again) = modifySubRegisterOperandStatus(DLD, MF);  in runOnMachineFunction()