gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-2.c

   1 /* Test that __builtin_prefetch does no harm.
   2
   3    Prefetch data using a variety of storage classes and address
   4    expressions.  */
   5
   6 int glob_int_arr[100];
   7 int *glob_ptr_int = glob_int_arr;
   8 int glob_int = 4;
   9
  10 static stat_int_arr[100];
  11 static int *stat_ptr_int = stat_int_arr;
  12 static int stat_int;
  13
  14 struct S {
  15   int a;
  16   short b, c;
  17   char d[8];
  18   struct S *next;
  19 };
  20
  21 struct S str;
  22 struct S *ptr_str = &str;
  23
  24 /* Prefetch global variables using the address of the variable.  */
  25
  26 void
  27 simple_global ()
  28 {
  29   __builtin_prefetch (glob_int_arr, 0, 0);
  30   __builtin_prefetch (glob_ptr_int, 0, 0);
  31   __builtin_prefetch (&glob_int, 0, 0);
  32 }
  33
  34 /* Prefetch file-level static variables using the address of the variable.  */
  35
  36 void
  37 simple_file ()
  38 {
  39   __builtin_prefetch (stat_int_arr, 0, 0);
  40   __builtin_prefetch (stat_ptr_int, 0, 0);
  41   __builtin_prefetch (&stat_int, 0, 0);
  42 }
  43
  44 /* Prefetch local static variables using the address of the variable.  */
  45
  46 void
  47 simple_static_local ()
  48 {
  49   static int gx[100];
  50   static int *hx = gx;
  51   static int ix;
  52   __builtin_prefetch (gx, 0, 0);
  53   __builtin_prefetch (hx, 0, 0);
  54   __builtin_prefetch (&ix, 0, 0);
  55 }
  56
  57 /* Prefetch local stack variables using the address of the variable.  */
  58
  59 void
  60 simple_local ()
  61 {
  62   int gx[100];
  63   int *hx = gx;
  64   int ix;
  65   __builtin_prefetch (gx, 0, 0);
  66   __builtin_prefetch (hx, 0, 0);
  67   __builtin_prefetch (&ix, 0, 0);
  68 }
  69
  70 /* Prefetch arguments using the address of the variable.  */
  71
  72 void
  73 simple_arg (int g[100], int *h, int i)
  74 {
  75   __builtin_prefetch (g, 0, 0);
  76   __builtin_prefetch (h, 0, 0);
  77   __builtin_prefetch (&i, 0, 0);
  78 }
  79
  80 /* Prefetch using address expressions involving global variables.  */
  81
  82 void
  83 expr_global (void)
  84 {
  85   __builtin_prefetch (&str, 0, 0);
  86   __builtin_prefetch (ptr_str, 0, 0);
  87   __builtin_prefetch (&str.b, 0, 0);
  88   __builtin_prefetch (&ptr_str->b, 0, 0);
  89   __builtin_prefetch (&str.d, 0, 0);
  90   __builtin_prefetch (&ptr_str->d, 0, 0);
  91   __builtin_prefetch (str.next, 0, 0);
  92   __builtin_prefetch (ptr_str->next, 0, 0);
  93   __builtin_prefetch (str.next->d, 0, 0);
  94   __builtin_prefetch (ptr_str->next->d, 0, 0);
  95
  96   __builtin_prefetch (&glob_int_arr, 0, 0);
  97   __builtin_prefetch (glob_ptr_int, 0, 0);
  98   __builtin_prefetch (&glob_int_arr[2], 0, 0);
  99   __builtin_prefetch (&glob_ptr_int[3], 0, 0);
 100   __builtin_prefetch (glob_int_arr+3, 0, 0);
 101   __builtin_prefetch (glob_int_arr+glob_int, 0, 0);
 102   __builtin_prefetch (glob_ptr_int+5, 0, 0);
 103   __builtin_prefetch (glob_ptr_int+glob_int, 0, 0);
 104 }
 105
 106 /* Prefetch using address expressions involving local variables.  */
 107
 108 void
 109 expr_local (void)
 110 {
 111   int b[10];
 112   int *pb = b;
 113   struct S t;
 114   struct S *pt = &t;
 115   int j = 4;
 116
 117   __builtin_prefetch (&t, 0, 0);
 118   __builtin_prefetch (pt, 0, 0);
 119   __builtin_prefetch (&t.b, 0, 0);
 120   __builtin_prefetch (&pt->b, 0, 0);
 121   __builtin_prefetch (&t.d, 0, 0);
 122   __builtin_prefetch (&pt->d, 0, 0);
 123   __builtin_prefetch (t.next, 0, 0);
 124   __builtin_prefetch (pt->next, 0, 0);
 125   __builtin_prefetch (t.next->d, 0, 0);
 126   __builtin_prefetch (pt->next->d, 0, 0);
 127
 128   __builtin_prefetch (&b, 0, 0);
 129   __builtin_prefetch (pb, 0, 0);
 130   __builtin_prefetch (&b[2], 0, 0);
 131   __builtin_prefetch (&pb[3], 0, 0);
 132   __builtin_prefetch (b+3, 0, 0);
 133   __builtin_prefetch (b+j, 0, 0);
 134   __builtin_prefetch (pb+5, 0, 0);
 135   __builtin_prefetch (pb+j, 0, 0);
 136 }
 137
 138 int
 139 main ()
 140 {
 141   simple_global ();
 142   simple_file ();
 143   simple_static_local ();
 144   simple_local ();
 145   simple_arg (glob_int_arr, glob_ptr_int, glob_int);
 146
 147   str.next = &str;
 148   expr_global ();
 149   expr_local ();
 150
 151   exit (0);
 152 }