Do GEP offset calculations with unsigned math rather than signed math
to avoid undefined behavior on overflow, noticed by John Regehr.
llvm-svn: 109594
diff --git a/llvm/lib/Target/TargetData.cpp b/llvm/lib/Target/TargetData.cpp
index 9b207c1..65f514c 100644
--- a/llvm/lib/Target/TargetData.cpp
+++ b/llvm/lib/Target/TargetData.cpp
@@ -625,7 +625,7 @@
// Get the array index and the size of each array element.
if (int64_t arrayIdx = cast<ConstantInt>(Indices[CurIDX])->getSExtValue())
- Result += arrayIdx * (int64_t)getTypeAllocSize(Ty);
+ Result += (uint64_t)arrayIdx * getTypeAllocSize(Ty);
}
}