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Fix a bug in function ComputeMaskedBits(). 

llvm-svn: 35027
This commit is contained in:
Zhou Sheng 2007-03-08 15:15:18 +00:00
parent ddf082082c
commit d1eb3d593e
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -677,7 +677,7 @@ static void ComputeMaskedBits(Value *V, APInt Mask, APInt& KnownZero,
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
Mask &= SrcTy->getMask().zext(BitWidth);
Mask &= SrcTy->getMask().zextOrTrunc(BitWidth);
ComputeMaskedBits(I->getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
// The top bits are known to be zero.
@ -689,7 +689,7 @@ static void ComputeMaskedBits(Value *V, APInt Mask, APInt& KnownZero,
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
Mask &= SrcTy->getMask().zext(BitWidth);
Mask &= SrcTy->getMask().zextOrTrunc(BitWidth);
ComputeMaskedBits(I->getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");