fix a bug handling 'not x' when x is undef.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88864 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp
index d5ce86a..de4c118 100644
--- a/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/lib/Transforms/Scalar/JumpThreading.cpp
@@ -350,8 +350,9 @@
// Invert the known values.
for (unsigned i = 0, e = Result.size(); i != e; ++i)
- Result[i].first =
- cast<ConstantInt>(ConstantExpr::getNot(Result[i].first));
+ if (Result[i].first)
+ Result[i].first =
+ cast<ConstantInt>(ConstantExpr::getNot(Result[i].first));
return true;
}
}