const TargetInstrInfo *tii_) {
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
- Reg == SrcReg)
+ Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0)
return true;
if (OpIdx == 2 && MI->isSubregToReg())
// Turn a copy use into an implicit_def.
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
- Reg == SrcReg) {
+ Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) {
RMI->setDesc(tii_->get(TargetOpcode::IMPLICIT_DEF));
bool isKill = false;