1  /* Test __atomic routines for existence and proper execution on 2 byte
       2     values with each valid memory model.  */
       3  /* Duplicate logic as libatomic/testsuite/libatomic.c/atomic-compare-exchange-2.c */
       4  /* { dg-do run } */
       5  /* { dg-options "-minline-atomics" } */
       6  
       7  /* Test the execution of the __atomic_compare_exchange_n builtin for a short.  */
       8  
       9  extern void abort(void);
      10  
      11  short v = 0;
      12  short expected = 0;
      13  short max = ~0;
      14  short desired = ~0;
      15  short zero = 0;
      16  
      17  #define STRONG 0
      18  #define WEAK 1
      19  
      20  int
      21  main ()
      22  {
      23  
      24    if (!__atomic_compare_exchange_n (&v, &expected, max, STRONG , __ATOMIC_RELAXED, __ATOMIC_RELAXED))
      25      abort ();
      26    if (expected != 0)
      27      abort ();
      28  
      29    if (__atomic_compare_exchange_n (&v, &expected, 0, STRONG , __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))
      30      abort ();
      31    if (expected != max)
      32      abort ();
      33  
      34    if (!__atomic_compare_exchange_n (&v, &expected, 0, STRONG , __ATOMIC_RELEASE, __ATOMIC_ACQUIRE))
      35      abort ();
      36    if (expected != max)
      37      abort ();
      38    if (v != 0)
      39      abort ();
      40  
      41    if (__atomic_compare_exchange_n (&v, &expected, desired, WEAK, __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE))
      42      abort ();
      43    if (expected != 0)
      44      abort ();
      45  
      46    if (!__atomic_compare_exchange_n (&v, &expected, desired, STRONG , __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
      47      abort ();
      48    if (expected != 0)
      49      abort ();
      50    if (v != max)
      51      abort ();
      52  
      53    /* Now test the generic version.  */
      54  
      55    v = 0;
      56  
      57    if (!__atomic_compare_exchange (&v, &expected, &max, STRONG, __ATOMIC_RELAXED, __ATOMIC_RELAXED))
      58      abort ();
      59    if (expected != 0)
      60      abort ();
      61  
      62    if (__atomic_compare_exchange (&v, &expected, &zero, STRONG , __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))
      63      abort ();
      64    if (expected != max)
      65      abort ();
      66  
      67    if (!__atomic_compare_exchange (&v, &expected, &zero, STRONG , __ATOMIC_RELEASE, __ATOMIC_ACQUIRE))
      68      abort ();
      69    if (expected != max)
      70      abort ();
      71    if (v != 0)
      72      abort ();
      73  
      74    if (__atomic_compare_exchange (&v, &expected, &desired, WEAK, __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE))
      75      abort ();
      76    if (expected != 0)
      77      abort ();
      78  
      79    if (!__atomic_compare_exchange (&v, &expected, &desired, STRONG , __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
      80      abort ();
      81    if (expected != 0)
      82      abort ();
      83    if (v != max)
      84      abort ();
      85  
      86    return 0;
      87  }