diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/MemCpyOptimizer.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/lib/Transforms/Scalar/MemCpyOptimizer.cpp index be0f0e8a25..8600c9ebf7 100644 --- a/lib/Transforms/Scalar/MemCpyOptimizer.cpp +++ b/lib/Transforms/Scalar/MemCpyOptimizer.cpp @@ -626,8 +626,10 @@ bool MemCpyOpt::performCallSlotOptzn(Instruction *cpy, return false; Type *StructTy = cast<PointerType>(A->getType())->getElementType(); - uint64_t destSize = TD->getTypeAllocSize(StructTy); - + // If StructTy is an opaque type, it should have at least <cpyLen> bytes, + // as implified by the copy-instruction. + uint64_t destSize = StructTy->isSized() ? + TD->getTypeAllocSize(StructTy) : cpyLen; if (destSize < srcSize) return false; } else { |