diff options
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 55 |
1 files changed, 27 insertions, 28 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 6f602da569e8..37414de4c240 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -4912,43 +4912,42 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts, break; } - case Intrinsic::trunc: { + case Intrinsic::trunc: + case Intrinsic::floor: + case Intrinsic::ceil: + case Intrinsic::rint: + case Intrinsic::nearbyint: + case Intrinsic::round: + case Intrinsic::roundeven: { KnownFPClass KnownSrc; - FPClassTest InterestedSrcs = InterestedClasses; - if (InterestedClasses & fcZero) - InterestedClasses |= fcNormal | fcSubnormal; - - computeKnownFPClass(II->getArgOperand(0), DemandedElts, InterestedSrcs, - KnownSrc, Depth + 1, Q, TLI); + if (InterestedSrcs & fcPosFinite) + InterestedSrcs |= fcPosFinite; + if (InterestedSrcs & fcNegFinite) + InterestedSrcs |= fcNegFinite; + computeKnownFPClass(II->getArgOperand(0), DemandedElts, + InterestedSrcs, KnownSrc, Depth + 1, Q, TLI); // Integer results cannot be subnormal. Known.knownNot(fcSubnormal); - // trunc passes through infinities. - if (KnownSrc.isKnownNeverPosInfinity()) - Known.knownNot(fcPosInf); - if (KnownSrc.isKnownNeverNegInfinity()) - Known.knownNot(fcNegInf); - - // Non-constrained intrinsics do not guarantee signaling nan quieting. - if (KnownSrc.isKnownNeverNaN()) - Known.knownNot(fcNan); - - if (KnownSrc.isKnownNever(fcPosNormal)) - Known.knownNot(fcPosNormal); - - if (KnownSrc.isKnownNever(fcNegNormal)) - Known.knownNot(fcNegNormal); + Known.propagateNaN(KnownSrc, true); - if (KnownSrc.isKnownNever(fcPosZero | fcPosSubnormal | fcPosNormal)) - Known.knownNot(fcPosZero); + // Pass through infinities, except PPC_FP128 is a special case for + // intrinsics other than trunc. + if (IID == Intrinsic::trunc || !V->getType()->isMultiUnitFPType()) { + if (KnownSrc.isKnownNeverPosInfinity()) + Known.knownNot(fcPosInf); + if (KnownSrc.isKnownNeverNegInfinity()) + Known.knownNot(fcNegInf); + } - if (KnownSrc.isKnownNever(fcNegZero | fcNegSubnormal | fcNegNormal)) - Known.knownNot(fcNegZero); + // Negative round ups to 0 produce -0 + if (KnownSrc.isKnownNever(fcPosFinite)) + Known.knownNot(fcPosFinite); + if (KnownSrc.isKnownNever(fcNegFinite)) + Known.knownNot(fcNegFinite); - // Sign should be preserved - Known.SignBit = KnownSrc.SignBit; break; } case Intrinsic::exp: |