1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/991228-1.c b/gcc/testsuite/gcc.c-torture/execute/991228-1.c
new file mode 100644
index 000000000..c6fe78e7d
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/991228-1.c
@@ -0,0 +1,25 @@
+__extension__ union { double d; int i[2]; } u = { d: -0.25 };
+
+/* This assumes the endianness of words in a long long is the same as
+   that for doubles, which doesn't hold for a few platforms, but we
+   can probably special case them here, as appropriate.  */
+long long endianness_test = 1;
+#define MSW (*(int*)&endianness_test)
+
+int
+signbit(double x)
+{
+  __extension__ union { double d; int i[2]; } u = { d: x };
+  return u.i[MSW] < 0;
+}
+    
+int main(void)
+{
+  if (2*sizeof(int) != sizeof(double) || u.i[MSW] >= 0)
+    exit(0);
+
+  if (!signbit(-0.25))
+    abort();
+
+  exit(0);
+}