Do GEP offset calculations with unsigned math rather than signed math
to avoid undefined behavior on overflow, noticed by John Regehr.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109594 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index 9b207c1..65f514c 100644
--- a/lib/Target/TargetData.cpp
+++ b/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);
}
}