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Avoid unnecessary APInt construction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35431 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zhou Sheng 2007-03-28 17:38:21 +00:00
parent e9a61234ce
commit 34a4b38cbd
1 changed files with 2 additions and 3 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -734,11 +734,10 @@ static void ComputeMaskedBits(Value *V, const APInt &Mask, APInt& KnownZero,
// If the sign bit of the input is known set or clear, then we know the
// top bits of the result.
APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
if (KnownZero[SrcBitWidth-1]) // Input sign bit known zero
KnownZero |= NewBits;
KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
else if (KnownOne[SrcBitWidth-1]) // Input sign bit known set
KnownOne |= NewBits;
KnownOne |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
return;
}
case Instruction::Shl: