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Fix bug: test/Regression/Transforms/LevelRaise/2002-05-02-BadCastElimination.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2429 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-02 17:37:34 +00:00
parent a1be566213
commit bbad858b3a
1 changed files with 9 additions and 0 deletions
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9
lib/Transforms/ExprTypeConvert.cpp
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@ -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