diff options
| -rw-r--r-- | lib/IR/Constants.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/IR/Constants.cpp b/lib/IR/Constants.cpp index 0c7effb5ca..70f7e0176e 100644 --- a/lib/IR/Constants.cpp +++ b/lib/IR/Constants.cpp @@ -47,6 +47,19 @@ bool Constant::isNegativeZeroValue() const { if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this)) return CFP->isZero() && CFP->isNegative(); + // Equivalent for a vector of -0.0's. + if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this)) + if (ConstantFP *SplatCFP = dyn_cast_or_null<ConstantFP>(CV->getSplatValue())) + if (SplatCFP && SplatCFP->isZero() && SplatCFP->isNegative()) + return true; + + // However, vectors of zeroes which are floating point represent +0.0's. + if (const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(this)) + if (const VectorType *VT = dyn_cast<VectorType>(CAZ->getType())) + if (VT->getElementType()->isFloatingPointTy()) + // As it's a CAZ, we know it's the zero bit-pattern (ie, +0.0) in each element. + return false; + // Otherwise, just use +0.0. return isNullValue(); } |