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