================
@@ -1905,7 +1905,28 @@ ValueTrackerResult ValueTracker::getNextSourceFromCopy()
{
const MachineOperand &Src = Def->getOperand(1);
if (Src.isUndef())
return ValueTrackerResult();
- return ValueTrackerResult(Src.getReg(), Src.getSubReg());
+
+ Register SrcReg = Src.getReg();
+ unsigned SubReg = Src.getSubReg();
+ if (DefSubReg) {
+ const TargetRegisterInfo *TRI = MRI.getTargetRegisterInfo();
+ SubReg = TRI->composeSubRegIndices(SubReg, DefSubReg);
+ if (SubReg) {
----------------
jayfoad wrote:
I don't think SubReg can ever be 0 here, since you previously checked that
DefSubReg is not 0.
https://github.com/llvm/llvm-project/pull/161310
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