--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgomp/testsuite/libgomp.c/atomic-2.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,37 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -mcx16" { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
+
+#ifdef __x86_64__
+#include "cpuid.h"
+#endif
+
+double d = 1.5;
+long double ld = 3;
+extern void abort (void);
+
+void
+test (void)
+{
+#pragma omp atomic
+  d *= 1.25;
+#pragma omp atomic
+  ld /= 0.75;
+  if (d != 1.875 || ld != 4.0L)
+    abort ();
+}
+
+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
+  test ();
+  return 0;
+}