diff options
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/ExprTypeConvert.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Transforms/ExprTypeConvert.cpp b/lib/Transforms/ExprTypeConvert.cpp index 02ee7b2d95..7e9c9aff2b 100644 --- a/lib/Transforms/ExprTypeConvert.cpp +++ b/lib/Transforms/ExprTypeConvert.cpp @@ -616,6 +616,15 @@ static bool OperandConvertableToType(User *U, Value *V, const Type *Ty, I->getType() == I->getOperand(0)->getType()) return false; + // Do not allow a 'cast ushort %V to uint' to have it's first operand be + // converted to a 'short' type. Doing so changes the way sign promotion + // happens, and breaks things. Only allow the cast to take place if the + // signedness doesn't change... or if the current cast is not a lossy + // conversion. + // + if (!I->getType()->isLosslesslyConvertableTo(I->getOperand(0)->getType()) && + I->getOperand(0)->getType()->isSigned() != Ty->isSigned()) + return false; #if 1 // We also do not allow conversion of a cast that casts from a ptr to array |