diff options
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 76f11a52b2..321b032505 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -2511,8 +2511,10 @@ Instruction *InstCombiner::visitSetCondInst(SetCondInst &I) { if (!CanFold) { // To test for the bad case of the signed shr, see if any // of the bits shifted in could be tested after the mask. - Constant *OShAmt = ConstantUInt::get(Type::UByteTy, - Ty->getPrimitiveSizeInBits()-ShAmt->getValue()); + int ShAmtVal = Ty->getPrimitiveSizeInBits()-ShAmt->getValue(); + if (ShAmtVal < 0) ShAmtVal = 0; // Out of range shift. + + Constant *OShAmt = ConstantUInt::get(Type::UByteTy, ShAmtVal); Constant *ShVal = ConstantExpr::getShl(ConstantInt::getAllOnesValue(Ty), OShAmt); if (ConstantExpr::getAnd(ShVal, AndCST)->isNullValue()) |