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avoid constructing out of range shift amounts.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22230 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2511,8 +2511,10 @@ Instruction *InstCombiner::visitSetCondInst(SetCondInst &I) {
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if (!CanFold) {
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// To test for the bad case of the signed shr, see if any
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// of the bits shifted in could be tested after the mask.
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Constant *OShAmt = ConstantUInt::get(Type::UByteTy,
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Ty->getPrimitiveSizeInBits()-ShAmt->getValue());
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int ShAmtVal = Ty->getPrimitiveSizeInBits()-ShAmt->getValue();
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if (ShAmtVal < 0) ShAmtVal = 0; // Out of range shift.
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Constant *OShAmt = ConstantUInt::get(Type::UByteTy, ShAmtVal);
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Constant *ShVal =
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ConstantExpr::getShl(ConstantInt::getAllOnesValue(Ty), OShAmt);
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if (ConstantExpr::getAnd(ShVal, AndCST)->isNullValue())
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