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PeepholeOpt: Remove dead checks for subregister def mismatch #130084

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Mar 7, 2025
Merged

PeepholeOpt: Remove dead checks for subregister def mismatch #130084

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5 changes: 1 addition & 4 deletions llvm/lib/CodeGen/PeepholeOptimizer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1904,11 +1904,8 @@ ValueTrackerResult ValueTracker::getNextSourceFromCopy() {
assert(Def->getNumOperands() - Def->getNumImplicitOperands() == 2 &&
"Invalid number of operands");
assert(!Def->hasImplicitDef() && "Only implicit uses are allowed");
assert(!Def->getOperand(DefIdx).getSubReg() && "no subregister defs in SSA");

if (Def->getOperand(DefIdx).getSubReg() != DefSubReg)
// If we look for a different subreg, it means we want a subreg of src.
// Bails as we do not support composing subregs yet.
return ValueTrackerResult();
// Otherwise, we want the whole source.
const MachineOperand &Src = Def->getOperand(1);
if (Src.isUndef())
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