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Avoid to assert on "(KnownZero & KnownOne) == 0".

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llvm-svn: 35062
This commit is contained in:
Zhou Sheng 2007-03-12 16:54:56 +00:00
parent c9c53385b8
commit c8583ff888
1 changed files with 1 additions and 1 deletions
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2
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -979,7 +979,7 @@ static bool MaskedValueIsZero(Value *V, uint64_t Mask, unsigned Depth = 0) {
/// this predicate to simplify operations downstream. Mask is known to be zero
/// for bits that V cannot have.
static bool MaskedValueIsZero(Value *V, const APInt& Mask, unsigned Depth = 0) {
APInt KnownZero(Mask), KnownOne(Mask);
APInt KnownZero(Mask.getBitWidth(), 0), KnownOne(Mask.getBitWidth(), 0);
ComputeMaskedBits(V, Mask, KnownZero, KnownOne, Depth);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
return (KnownZero & Mask) == Mask;