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[GISel] Avoid creating a virtual register we don't need. #119305

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Merged
merged 1 commit into from
Dec 10, 2024
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[GISel] Avoid creating a virtual register we don't need. #119305

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4 changes: 3 additions & 1 deletion llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6406,10 +6406,12 @@ LegalizerHelper::narrowScalarAddSub(MachineInstr &MI, unsigned TypeIdx,
for (int i = 0, e = Src1Regs.size(); i != e; ++i) {
Register DstReg =
MRI.createGenericVirtualRegister(MRI.getType(Src1Regs[i]));
Register CarryOut = MRI.createGenericVirtualRegister(LLT::scalar(1));
Register CarryOut;
// Forward the final carry-out to the destination register
if (i == e - 1 && CarryDst)
CarryOut = CarryDst;
else
CarryOut = MRI.createGenericVirtualRegister(LLT::scalar(1));

if (!CarryIn) {
MIRBuilder.buildInstr(OpO, {DstReg, CarryOut},
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