1  /* Test that __builtin_prefetch does no harm.
       2  
       3     Prefetch data using a variety of storage classes and address
       4     expressions with volatile variables and pointers.  */
       5  
       6  int glob_int_arr[100];
       7  int glob_int = 4;
       8  volatile int glob_vol_int_arr[100];
       9  int * volatile glob_vol_ptr_int = glob_int_arr;
      10  volatile int *glob_ptr_vol_int = glob_vol_int_arr;
      11  volatile int * volatile glob_vol_ptr_vol_int = glob_vol_int_arr;
      12  volatile int glob_vol_int;
      13  
      14  static stat_int_arr[100];
      15  static volatile int stat_vol_int_arr[100];
      16  static int * volatile stat_vol_ptr_int = stat_int_arr;
      17  static volatile int *stat_ptr_vol_int = stat_vol_int_arr;
      18  static volatile int * volatile stat_vol_ptr_vol_int = stat_vol_int_arr;
      19  static volatile int stat_vol_int;
      20  
      21  struct S {
      22    int a;
      23    short b, c;
      24    char d[8];
      25    struct S *next;
      26  };
      27  
      28  struct S str;
      29  volatile struct S vol_str;
      30  struct S * volatile vol_ptr_str = &str;
      31  volatile struct S *ptr_vol_str = &vol_str;
      32  volatile struct S * volatile vol_ptr_vol_str = &vol_str;
      33  
      34  /* Prefetch volatile global variables using the address of the variable.  */
      35  
      36  void
      37  simple_vol_global ()
      38  {
      39    __builtin_prefetch (glob_vol_int_arr, 0, 0);
      40    __builtin_prefetch (glob_vol_ptr_int, 0, 0);
      41    __builtin_prefetch (glob_ptr_vol_int, 0, 0);
      42    __builtin_prefetch (glob_vol_ptr_vol_int, 0, 0);
      43    __builtin_prefetch (&glob_vol_int, 0, 0);
      44  }
      45  
      46  /* Prefetch volatile static variables using the address of the variable.  */
      47  
      48  void
      49  simple_vol_file ()
      50  {
      51    __builtin_prefetch (stat_vol_int_arr, 0, 0);
      52    __builtin_prefetch (stat_vol_ptr_int, 0, 0);
      53    __builtin_prefetch (stat_ptr_vol_int, 0, 0);
      54    __builtin_prefetch (stat_vol_ptr_vol_int, 0, 0);
      55    __builtin_prefetch (&stat_vol_int, 0, 0);
      56  }
      57  
      58  /* Prefetch using address expressions involving volatile global variables.  */
      59  
      60  void
      61  expr_vol_global (void)
      62  {
      63    __builtin_prefetch (&vol_str, 0, 0);
      64    __builtin_prefetch (ptr_vol_str, 0, 0);
      65    __builtin_prefetch (vol_ptr_str, 0, 0);
      66    __builtin_prefetch (vol_ptr_vol_str, 0, 0);
      67    __builtin_prefetch (&vol_str.b, 0, 0);
      68    __builtin_prefetch (&ptr_vol_str->b, 0, 0);
      69    __builtin_prefetch (&vol_ptr_str->b, 0, 0);
      70    __builtin_prefetch (&vol_ptr_vol_str->b, 0, 0);
      71    __builtin_prefetch (&vol_str.d, 0, 0);
      72    __builtin_prefetch (&vol_ptr_str->d, 0, 0);
      73    __builtin_prefetch (&ptr_vol_str->d, 0, 0);
      74    __builtin_prefetch (&vol_ptr_vol_str->d, 0, 0);
      75    __builtin_prefetch (vol_str.next, 0, 0);
      76    __builtin_prefetch (vol_ptr_str->next, 0, 0);
      77    __builtin_prefetch (ptr_vol_str->next, 0, 0);
      78    __builtin_prefetch (vol_ptr_vol_str->next, 0, 0);
      79    __builtin_prefetch (vol_str.next->d, 0, 0);
      80    __builtin_prefetch (vol_ptr_str->next->d, 0, 0);
      81    __builtin_prefetch (ptr_vol_str->next->d, 0, 0);
      82    __builtin_prefetch (vol_ptr_vol_str->next->d, 0, 0);
      83  
      84    __builtin_prefetch (&glob_vol_int_arr, 0, 0);
      85    __builtin_prefetch (glob_vol_ptr_int, 0, 0);
      86    __builtin_prefetch (glob_ptr_vol_int, 0, 0);
      87    __builtin_prefetch (glob_vol_ptr_vol_int, 0, 0);
      88    __builtin_prefetch (&glob_vol_int_arr[2], 0, 0);
      89    __builtin_prefetch (&glob_vol_ptr_int[3], 0, 0);
      90    __builtin_prefetch (&glob_ptr_vol_int[3], 0, 0);
      91    __builtin_prefetch (&glob_vol_ptr_vol_int[3], 0, 0);
      92    __builtin_prefetch (glob_vol_int_arr+3, 0, 0);
      93    __builtin_prefetch (glob_vol_int_arr+glob_vol_int, 0, 0);
      94    __builtin_prefetch (glob_vol_ptr_int+5, 0, 0);
      95    __builtin_prefetch (glob_ptr_vol_int+5, 0, 0);
      96    __builtin_prefetch (glob_vol_ptr_vol_int+5, 0, 0);
      97    __builtin_prefetch (glob_vol_ptr_int+glob_vol_int, 0, 0);
      98    __builtin_prefetch (glob_ptr_vol_int+glob_vol_int, 0, 0);
      99    __builtin_prefetch (glob_vol_ptr_vol_int+glob_vol_int, 0, 0);
     100  }
     101  
     102  int
     103  main ()
     104  {
     105    simple_vol_global ();
     106    simple_vol_file ();
     107  
     108    str.next = &str;
     109    vol_str.next = &str;
     110    expr_vol_global ();
     111  
     112    exit (0);
     113  }