1 files changed, 11 insertions, 0 deletions
diff --git a/test/C++Frontend/2003-05-21-UnionTest.c b/test/C++Frontend/2003-05-21-UnionTest.c
new file mode 100644
index 0000000000..626ba09d76
--- /dev/null
+++ b/test/C++Frontend/2003-05-21-UnionTest.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int __signbit (double __x) {
+  union { double __d; int __i[3]; } __u = { __d: __x };
+  return __u.__i[1] < 0;
+}
+
+int main() {
+  printf("%d %d\n", __signbit(-1), __signbit(2.0));
+  return 0;
+}