diff options
Diffstat (limited to 'lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index 7ab4d2b..a612f13 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/lib/Analysis/ValueTracking.cpp @@ -255,14 +255,13 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask, else SrcBitWidth = SrcTy->getScalarSizeInBits(); - APInt MaskIn(Mask); - MaskIn.zextOrTrunc(SrcBitWidth); - KnownZero.zextOrTrunc(SrcBitWidth); - KnownOne.zextOrTrunc(SrcBitWidth); + APInt MaskIn = Mask.zextOrTrunc(SrcBitWidth); + KnownZero = KnownZero.zextOrTrunc(SrcBitWidth); + KnownOne = KnownOne.zextOrTrunc(SrcBitWidth); ComputeMaskedBits(I->getOperand(0), MaskIn, KnownZero, KnownOne, TD, Depth+1); - KnownZero.zextOrTrunc(BitWidth); - KnownOne.zextOrTrunc(BitWidth); + KnownZero = KnownZero.zextOrTrunc(BitWidth); + KnownOne = KnownOne.zextOrTrunc(BitWidth); // Any top bits are known to be zero. if (BitWidth > SrcBitWidth) KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth); @@ -284,15 +283,14 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask, // Compute the bits in the result that are not present in the input. unsigned SrcBitWidth = I->getOperand(0)->getType()->getScalarSizeInBits(); - APInt MaskIn(Mask); - MaskIn.trunc(SrcBitWidth); - KnownZero.trunc(SrcBitWidth); - KnownOne.trunc(SrcBitWidth); + APInt MaskIn = Mask.trunc(SrcBitWidth); + KnownZero = KnownZero.trunc(SrcBitWidth); + KnownOne = KnownOne.trunc(SrcBitWidth); ComputeMaskedBits(I->getOperand(0), MaskIn, KnownZero, KnownOne, TD, Depth+1); assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); - KnownZero.zext(BitWidth); - KnownOne.zext(BitWidth); + KnownZero = KnownZero.zext(BitWidth); + KnownOne = KnownOne.zext(BitWidth); // If the sign bit of the input is known set or clear, then we know the // top bits of the result. |