--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgomp/testsuite/libgomp.c/atomic-5.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,41 @@
+/* PR middle-end/36106 */
+/* { dg-options "-O2" } */
+/* { dg-options "-O2 -mcx16" { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
+
+#ifdef __x86_64__
+# include "cpuid.h"
+#endif
+
+extern void abort (void);
+
+int __attribute__((noinline))
+do_test (void)
+{
+  long double d = .0L;
+  int i;
+  #pragma omp parallel for shared (d)
+    for (i = 0; i < 10; i++)
+      #pragma omp atomic
+	d += 1.0L;
+  if (d != 10.0L)
+    abort ();
+  return 0;
+}
+
+int
+main (void)
+{
+#ifdef __x86_64__
+  unsigned int eax, ebx, ecx, edx;
+
+  if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
+    return 0;
+
+  if (!(ecx & bit_CMPXCHG16B))
+    return 0;
+#endif
+
+  do_test ();
+
+  return 0;
+}