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| author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2023-04-17 22:14:36 -0400 |
|---|---|---|
| committer | Matt Arsenault <arsenm2@gmail.com> | 2023-05-17 23:40:06 +0100 |
| commit | dd61b63b5ca1c8a15013e2154bf3b30243df66bd (patch) | |
| tree | 20ac548e78dfabddf682bf7b3fe8f2f28857c71d /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | 6666969a08001c37b564cdd9e8da7b5c7291788c (diff) | |
| download | llvm-dd61b63b5ca1c8a15013e2154bf3b30243df66bd.tar.gz | |
ValueTracking: Handle sign bit for fptrunc in computeKnownFPClass
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 37414de4c240..05ed497b7601 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -4617,17 +4617,22 @@ static void computeKnownFPClassForFPTrunc(const Operator *Op, KnownFPClass &Known, unsigned Depth, const Query &Q, const TargetLibraryInfo *TLI) { - if ((InterestedClasses & fcNan) == fcNone) + if ((InterestedClasses & + (KnownFPClass::OrderedLessThanZeroMask | fcNan)) == fcNone) return; KnownFPClass KnownSrc; computeKnownFPClass(Op->getOperand(0), DemandedElts, InterestedClasses, KnownSrc, Depth + 1, Q, TLI); - if (KnownSrc.isKnownNeverNaN()) - Known.knownNot(fcNan); + + // Sign should be preserved + // TODO: Handle cannot be ordered greater than zero + if (KnownSrc.cannotBeOrderedLessThanZero()) + Known.knownNot(KnownFPClass::OrderedLessThanZeroMask); + + Known.propagateNaN(KnownSrc, true); // Infinity needs a range check. - // TODO: Sign bit should be preserved } // TODO: Merge implementations of isKnownNeverNaN, isKnownNeverInfinity, |