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[SelectionDAGBuilder] Propagate fast-math flags to fpext #167574

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Merged
merged 3 commits into from
Nov 15, 2025
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[SelectionDAGBuilder] Propagate fast-math flags to fpext #167574

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2cc7c09
Propagate fast-math flags through fpext
mikolaj-pirog Nov 11, 2025
bf228bb
Check for arcp on fpext on fdiv combine
mikolaj-pirog Nov 13, 2025
31250ab
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mikolaj-pirog Nov 13, 2025
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5 changes: 4 additions & 1 deletion llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3976,7 +3976,10 @@ void SelectionDAGBuilder::visitFPExt(const User &I) {
SDValue N = getValue(I.getOperand(0));
EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
I.getType());
setValue(&I, DAG.getNode(ISD::FP_EXTEND, getCurSDLoc(), DestVT, N));
SDNodeFlags Flags;
if (auto *TruncInst = dyn_cast<FPMathOperator>(&I))
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@bjope bjope Nov 16, 2025

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TruncInst is confusing here (I guess it has been copied from somewhere). You could perhaps all it Operator or FPExtInst or something, but it seems like FPOp is a common variable name when dyn_cast-ing to a FPMathOperator. So I would suggest FPOp.

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@mikolaj-pirog mikolaj-pirog Nov 17, 2025

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You are right, I will follow-up with a correct name

Flags.copyFMF(*TruncInst);
setValue(&I, DAG.getNode(ISD::FP_EXTEND, getCurSDLoc(), DestVT, N, Flags));
}

void SelectionDAGBuilder::visitFPToUI(const User &I) {
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