1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGen/2002-08-02-UnionTest.c b/test/CodeGen/2002-08-02-UnionTest.c
new file mode 100644
index 000000000000..2be149909be5
--- /dev/null
+++ b/test/CodeGen/2002-08-02-UnionTest.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -emit-llvm %s  -o /dev/null
+
+/* In this testcase, the return value of foo() is being promoted to a register
+ * which breaks stuff
+ */
+int printf(const char * restrict format, ...);
+
+union X { char X; void *B; int a, b, c, d;};
+
+union X foo() {
+  union X Global;
+  Global.B = (void*)123;   /* Interesting part */
+  return Global;
+}
+
+int main() {
+  union X test = foo();
+  printf("0x%p", test.B);
+}