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[X86][Windows] use LowerWin64_INT128_TO_FP for u128 to f128 conversion #207285

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Merged
folkertdev merged 1 commit into from
Jul 7, 2026
Merged

[X86][Windows] use LowerWin64_INT128_TO_FP for u128 to f128 conversion #207285

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22 changes: 11 additions & 11 deletions llvm/lib/Target/X86/X86ISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -21439,32 +21439,32 @@ SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
bool IsStrict = Op->isStrictFPOpcode();
unsigned OpNo = IsStrict ? 1 : 0;
SDValue Src = Op.getOperand(OpNo);
SDLoc dl(Op);
SDValue Chain = IsStrict ? Op.getOperand(0) : DAG.getEntryNode();
auto PtrVT = getPointerTy(DAG.getDataLayout());
MVT SrcVT = Src.getSimpleValueType();
MVT DstVT = Op->getSimpleValueType(0);
SDValue Chain = IsStrict ? Op.getOperand(0) : DAG.getEntryNode();

// Bail out when we don't have native conversion instructions.
if (DstVT == MVT::f128)
return SDValue();
SDLoc dl(Op);

if (isBF16orSoftF16(DstVT, Subtarget))
return promoteXINT_TO_FP(Op, dl, DAG);
else if (isLegalConversion(SrcVT, DstVT, false, Subtarget))
return Op;

if (Subtarget.isTargetWin64() && SrcVT == MVT::i128)
return LowerWin64_INT128_TO_FP(Op, DAG);

if (SDValue Extract = vectorizeExtractedCast(Op, dl, DAG, Subtarget))
return Extract;

if (SDValue V = lowerFPToIntToFP(Op, dl, DAG, Subtarget))
return V;

if (DstVT.isVector())
return lowerUINT_TO_FP_vec(Op, dl, DAG, Subtarget);

if (Subtarget.isTargetWin64() && SrcVT == MVT::i128)
return LowerWin64_INT128_TO_FP(Op, DAG);

if (SDValue Extract = vectorizeExtractedCast(Op, dl, DAG, Subtarget))
return Extract;
// Bail out when we don't have native conversion instructions.
if (DstVT == MVT::f128)
return SDValue();

if (Subtarget.hasAVX512() && isScalarFPTypeInSSEReg(DstVT) &&
(SrcVT == MVT::i32 || (SrcVT == MVT::i64 && Subtarget.is64Bit()))) {
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