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a6527d6a61
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117477e28b
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@ -734,11 +734,10 @@ static void ComputeMaskedBits(Value *V, const APInt &Mask, APInt& KnownZero,
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// If the sign bit of the input is known set or clear, then we know the
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// top bits of the result.
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APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
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if (KnownZero[SrcBitWidth-1]) // Input sign bit known zero
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KnownZero |= NewBits;
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KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
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else if (KnownOne[SrcBitWidth-1]) // Input sign bit known set
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KnownOne |= NewBits;
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KnownOne |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
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return;
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}
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case Instruction::Shl:
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