diff options
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineCasts.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineCasts.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCasts.cpp b/lib/Transforms/InstCombine/InstCombineCasts.cpp index 199902aa41..601d9b42f3 100644 --- a/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -71,6 +71,11 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI, // This requires TargetData to get the alloca alignment and size information. if (!TD) return 0; + // Insist that the amount-to-allocate not overflow. + OverflowingBinaryOperator *OBI = + dyn_cast<OverflowingBinaryOperator>(AI.getOperand(0)); + if (OBI && !(OBI->hasNoSignedWrap() || OBI->hasNoUnsignedWrap())) return 0; + const PointerType *PTy = cast<PointerType>(CI.getType()); BuilderTy AllocaBuilder(*Builder); |