gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c

   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 void exit (int);
   7
   8 int glob_int_arr[100];
   9 int glob_int = 4;
  10 volatile int glob_vol_int_arr[100];
  11 int * volatile glob_vol_ptr_int = glob_int_arr;
  12 volatile int *glob_ptr_vol_int = glob_vol_int_arr;
  13 volatile int * volatile glob_vol_ptr_vol_int = glob_vol_int_arr;
  14 volatile int glob_vol_int;
  15
  16 static int stat_int_arr[100];
  17 static volatile int stat_vol_int_arr[100];
  18 static int * volatile stat_vol_ptr_int = stat_int_arr;
  19 static volatile int *stat_ptr_vol_int = stat_vol_int_arr;
  20 static volatile int * volatile stat_vol_ptr_vol_int = stat_vol_int_arr;
  21 static volatile int stat_vol_int;
  22
  23 struct S {
  24   int a;
  25   short b, c;
  26   char d[8];
  27   struct S *next;
  28 };
  29
  30 struct S str;
  31 volatile struct S vol_str;
  32 struct S * volatile vol_ptr_str = &str;
  33 volatile struct S *ptr_vol_str = &vol_str;
  34 volatile struct S * volatile vol_ptr_vol_str = &vol_str;
  35
  36 /* Prefetch volatile global variables using the address of the variable.  */
  37
  38 void
  39 simple_vol_global ()
  40 {
  41   __builtin_prefetch (glob_vol_int_arr, 0, 0);
  42   __builtin_prefetch (glob_vol_ptr_int, 0, 0);
  43   __builtin_prefetch (glob_ptr_vol_int, 0, 0);
  44   __builtin_prefetch (glob_vol_ptr_vol_int, 0, 0);
  45   __builtin_prefetch (&glob_vol_int, 0, 0);
  46 }
  47
  48 /* Prefetch volatile static variables using the address of the variable.  */
  49
  50 void
  51 simple_vol_file ()
  52 {
  53   __builtin_prefetch (stat_vol_int_arr, 0, 0);
  54   __builtin_prefetch (stat_vol_ptr_int, 0, 0);
  55   __builtin_prefetch (stat_ptr_vol_int, 0, 0);
  56   __builtin_prefetch (stat_vol_ptr_vol_int, 0, 0);
  57   __builtin_prefetch (&stat_vol_int, 0, 0);
  58 }
  59
  60 /* Prefetch using address expressions involving volatile global variables.  */
  61
  62 void
  63 expr_vol_global (void)
  64 {
  65   __builtin_prefetch (&vol_str, 0, 0);
  66   __builtin_prefetch (ptr_vol_str, 0, 0);
  67   __builtin_prefetch (vol_ptr_str, 0, 0);
  68   __builtin_prefetch (vol_ptr_vol_str, 0, 0);
  69   __builtin_prefetch (&vol_str.b, 0, 0);
  70   __builtin_prefetch (&ptr_vol_str->b, 0, 0);
  71   __builtin_prefetch (&vol_ptr_str->b, 0, 0);
  72   __builtin_prefetch (&vol_ptr_vol_str->b, 0, 0);
  73   __builtin_prefetch (&vol_str.d, 0, 0);
  74   __builtin_prefetch (&vol_ptr_str->d, 0, 0);
  75   __builtin_prefetch (&ptr_vol_str->d, 0, 0);
  76   __builtin_prefetch (&vol_ptr_vol_str->d, 0, 0);
  77   __builtin_prefetch (vol_str.next, 0, 0);
  78   __builtin_prefetch (vol_ptr_str->next, 0, 0);
  79   __builtin_prefetch (ptr_vol_str->next, 0, 0);
  80   __builtin_prefetch (vol_ptr_vol_str->next, 0, 0);
  81   __builtin_prefetch (vol_str.next->d, 0, 0);
  82   __builtin_prefetch (vol_ptr_str->next->d, 0, 0);
  83   __builtin_prefetch (ptr_vol_str->next->d, 0, 0);
  84   __builtin_prefetch (vol_ptr_vol_str->next->d, 0, 0);
  85
  86   __builtin_prefetch (&glob_vol_int_arr, 0, 0);
  87   __builtin_prefetch (glob_vol_ptr_int, 0, 0);
  88   __builtin_prefetch (glob_ptr_vol_int, 0, 0);
  89   __builtin_prefetch (glob_vol_ptr_vol_int, 0, 0);
  90   __builtin_prefetch (&glob_vol_int_arr[2], 0, 0);
  91   __builtin_prefetch (&glob_vol_ptr_int[3], 0, 0);
  92   __builtin_prefetch (&glob_ptr_vol_int[3], 0, 0);
  93   __builtin_prefetch (&glob_vol_ptr_vol_int[3], 0, 0);
  94   __builtin_prefetch (glob_vol_int_arr+3, 0, 0);
  95   __builtin_prefetch (glob_vol_int_arr+glob_vol_int, 0, 0);
  96   __builtin_prefetch (glob_vol_ptr_int+5, 0, 0);
  97   __builtin_prefetch (glob_ptr_vol_int+5, 0, 0);
  98   __builtin_prefetch (glob_vol_ptr_vol_int+5, 0, 0);
  99   __builtin_prefetch (glob_vol_ptr_int+glob_vol_int, 0, 0);
 100   __builtin_prefetch (glob_ptr_vol_int+glob_vol_int, 0, 0);
 101   __builtin_prefetch (glob_vol_ptr_vol_int+glob_vol_int, 0, 0);
 102 }
 103
 104 int
 105 main ()
 106 {
 107   simple_vol_global ();
 108   simple_vol_file ();
 109
 110   str.next = &str;
 111   vol_str.next = &str;
 112   expr_vol_global ();
 113
 114   exit (0);
 115 }