1/* PR middle-end/36106 */
2/* { dg-options "-O2" } */
3/* { dg-options "-O2 -mieee" { target alpha*-*-* } } */
4/* { dg-options "-O2 -march=i586" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
5
6#ifdef __i386__
7# include "cpuid.h"
8#endif
9
10extern void abort (void);
11
12union { unsigned long long l; double d; } u = { .l = 0x7ff0000000072301ULL };
13
14int __attribute__((noinline))
15do_test (void)
16{
17#pragma omp atomic
18  u.d += 1.0L;
19  return 0;
20}
21
22int
23main (void)
24{
25#ifdef __i386__
26  unsigned int eax, ebx, ecx, edx;
27
28  if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
29    return 0;
30
31  if (!(edx & bit_CMPXCHG8B))
32    return 0;
33#endif
34
35  do_test ();
36
37  return 0;
38}
39