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[ValueTracking] Consistently propagate DemandedElts in ValueTracking functions #99080

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[ValueTracking] Consistently propagate DemandedElts in ValueTracking functions #99080

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465c853
[ValueTracking] Add tests for `llvm.vector.reverse` with `DemandedElt…
goldsteinn Jul 17, 2024
c6fedfe
[ValueTracking] Consistently propagate `DemandedElts` is `computeKnow…
goldsteinn Jul 16, 2024
3ece17d
[ValueTracking] Consistently propagate `DemandedElts` is `isKnownNonZ…
goldsteinn Jul 16, 2024
3146242
[ValueTracking] Consistently propagate `DemandedElts` is `ComputeNumS…
goldsteinn Jul 16, 2024
7cbaea7
[ValueTracking] Consistently propagate `DemandedElts` is `computeKnow…
goldsteinn Jul 16, 2024
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22 changes: 17 additions & 5 deletions llvm/include/llvm/Analysis/ValueTracking.h
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Original file line number Diff line number Diff line change
Expand Up @@ -526,16 +526,17 @@ inline KnownFPClass computeKnownFPClass(
}

/// Wrapper to account for known fast math flags at the use instruction.
inline KnownFPClass computeKnownFPClass(const Value *V, FastMathFlags FMF,
FPClassTest InterestedClasses,
unsigned Depth,
const SimplifyQuery &SQ) {
inline KnownFPClass
computeKnownFPClass(const Value *V, const APInt &DemandedElts,
FastMathFlags FMF, FPClassTest InterestedClasses,
unsigned Depth, const SimplifyQuery &SQ) {
if (FMF.noNaNs())
InterestedClasses &= ~fcNan;
if (FMF.noInfs())
InterestedClasses &= ~fcInf;

KnownFPClass Result = computeKnownFPClass(V, InterestedClasses, Depth, SQ);
KnownFPClass Result =
computeKnownFPClass(V, DemandedElts, InterestedClasses, Depth, SQ);

if (FMF.noNaNs())
Result.KnownFPClasses &= ~fcNan;
Expand All @@ -544,6 +545,17 @@ inline KnownFPClass computeKnownFPClass(const Value *V, FastMathFlags FMF,
return Result;
}

inline KnownFPClass computeKnownFPClass(const Value *V, FastMathFlags FMF,
FPClassTest InterestedClasses,
unsigned Depth,
const SimplifyQuery &SQ) {
auto *FVTy = dyn_cast<FixedVectorType>(V->getType());
APInt DemandedElts =
FVTy ? APInt::getAllOnes(FVTy->getNumElements()) : APInt(1, 1);
return computeKnownFPClass(V, DemandedElts, FMF, InterestedClasses, Depth,
SQ);
}

/// Return true if we can prove that the specified FP value is never equal to
/// -0.0. Users should use caution when considering PreserveSign
/// denormal-fp-math.
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