diff --git a/test/CodeGen/union.c b/test/CodeGen/union.c
new file mode 100644
index 0000000..8102f9b
--- /dev/null
+++ b/test/CodeGen/union.c
@@ -0,0 +1,18 @@
+// RUN: clang %s -emit-llvm
+
+union {
+  int a;
+  float b;
+} u;
+
+void f() {
+  u.b = 11;
+}
+
+int f2( float __x ) { 
+  union{ 
+    float __f; 
+    unsigned int __u; 
+  }__u;
+  return (int)(__u.__u >> 31); 
+}