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Fix a bug in APIntified ComputeMaskedBits().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35022 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -675,11 +675,9 @@ static void ComputeMaskedBits(Value *V, APInt Mask, APInt& KnownZero,
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case Instruction::ZExt: {
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// Compute the bits in the result that are not present in the input.
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const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
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APInt NotIn(~SrcTy->getMask());
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APInt NewBits = APInt::getAllOnesValue(BitWidth) &
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NotIn.zext(BitWidth);
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APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
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Mask &= ~NotIn;
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Mask &= SrcTy->getMask().zext(BitWidth);
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ComputeMaskedBits(I->getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
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assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
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// The top bits are known to be zero.
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@ -689,11 +687,9 @@ static void ComputeMaskedBits(Value *V, APInt Mask, APInt& KnownZero,
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case Instruction::SExt: {
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// Compute the bits in the result that are not present in the input.
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const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
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APInt NotIn(~SrcTy->getMask());
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APInt NewBits = APInt::getAllOnesValue(BitWidth) &
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NotIn.zext(BitWidth);
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APInt NewBits(APInt::getAllOnesValue(BitWidth).shl(SrcTy->getBitWidth()));
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Mask &= ~NotIn;
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Mask &= SrcTy->getMask().zext(BitWidth);
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ComputeMaskedBits(I->getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
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assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
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