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A few more cases of missing masking in ComputeMaskedBits; found by inspection.

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llvm-svn: 152070
This commit is contained in:
Eli Friedman 2012-03-05 23:22:40 +00:00
parent 91314c2db6
commit eec5df7382
1 changed files with 3 additions and 3 deletions
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6
lib/Analysis/ValueTracking.cpp
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@ -723,17 +723,17 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
// If this call is undefined for 0, the result will be less than 2^n.
if (II->getArgOperand(1) == ConstantInt::getTrue(II->getContext()))
LowBits -= 1;
KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
KnownZero = Mask & APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
break;
}
case Intrinsic::ctpop: {
unsigned LowBits = Log2_32(BitWidth)+1;
KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
KnownZero = Mask & APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
break;
}
case Intrinsic::x86_sse42_crc32_64_8:
case Intrinsic::x86_sse42_crc32_64_64:
KnownZero = APInt::getHighBitsSet(64, 32);
KnownZero = Mask & APInt::getHighBitsSet(64, 32);
break;
}
}