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 void exit (int);
   7
   8 int glob_int_arr[100];
   9 int *glob_ptr_int = glob_int_arr;
  10 int glob_int = 4;
  11
  12 static int stat_int_arr[100];
  13 static int *stat_ptr_int = stat_int_arr;
  14 static int stat_int;
  15
  16 struct S {
  17   int a;
  18   short b, c;
  19   char d[8];
  20   struct S *next;
  21 };
  22
  23 struct S str;
  24 struct S *ptr_str = &str;
  25
  26 /* Prefetch global variables using the address of the variable.  */
  27
  28 void
  29 simple_global ()
  30 {
  31   __builtin_prefetch (glob_int_arr, 0, 0);
  32   __builtin_prefetch (glob_ptr_int, 0, 0);
  33   __builtin_prefetch (&glob_int, 0, 0);
  34 }
  35
  36 /* Prefetch file-level static variables using the address of the variable.  */
  37
  38 void
  39 simple_file ()
  40 {
  41   __builtin_prefetch (stat_int_arr, 0, 0);
  42   __builtin_prefetch (stat_ptr_int, 0, 0);
  43   __builtin_prefetch (&stat_int, 0, 0);
  44 }
  45
  46 /* Prefetch local static variables using the address of the variable.  */
  47
  48 void
  49 simple_static_local ()
  50 {
  51   static int gx[100];
  52   static int *hx = gx;
  53   static int ix;
  54   __builtin_prefetch (gx, 0, 0);
  55   __builtin_prefetch (hx, 0, 0);
  56   __builtin_prefetch (&ix, 0, 0);
  57 }
  58
  59 /* Prefetch local stack variables using the address of the variable.  */
  60
  61 void
  62 simple_local ()
  63 {
  64   int gx[100];
  65   int *hx = gx;
  66   int ix;
  67   __builtin_prefetch (gx, 0, 0);
  68   __builtin_prefetch (hx, 0, 0);
  69   __builtin_prefetch (&ix, 0, 0);
  70 }
  71
  72 /* Prefetch arguments using the address of the variable.  */
  73
  74 void
  75 simple_arg (int g[100], int *h, int i)
  76 {
  77   __builtin_prefetch (g, 0, 0);
  78   __builtin_prefetch (h, 0, 0);
  79   __builtin_prefetch (&i, 0, 0);
  80 }
  81
  82 /* Prefetch using address expressions involving global variables.  */
  83
  84 void
  85 expr_global (void)
  86 {
  87   __builtin_prefetch (&str, 0, 0);
  88   __builtin_prefetch (ptr_str, 0, 0);
  89   __builtin_prefetch (&str.b, 0, 0);
  90   __builtin_prefetch (&ptr_str->b, 0, 0);
  91   __builtin_prefetch (&str.d, 0, 0);
  92   __builtin_prefetch (&ptr_str->d, 0, 0);
  93   __builtin_prefetch (str.next, 0, 0);
  94   __builtin_prefetch (ptr_str->next, 0, 0);
  95   __builtin_prefetch (str.next->d, 0, 0);
  96   __builtin_prefetch (ptr_str->next->d, 0, 0);
  97
  98   __builtin_prefetch (&glob_int_arr, 0, 0);
  99   __builtin_prefetch (glob_ptr_int, 0, 0);
 100   __builtin_prefetch (&glob_int_arr[2], 0, 0);
 101   __builtin_prefetch (&glob_ptr_int[3], 0, 0);
 102   __builtin_prefetch (glob_int_arr+3, 0, 0);
 103   __builtin_prefetch (glob_int_arr+glob_int, 0, 0);
 104   __builtin_prefetch (glob_ptr_int+5, 0, 0);
 105   __builtin_prefetch (glob_ptr_int+glob_int, 0, 0);
 106 }
 107
 108 /* Prefetch using address expressions involving local variables.  */
 109
 110 void
 111 expr_local (void)
 112 {
 113   int b[10];
 114   int *pb = b;
 115   struct S t;
 116   struct S *pt = &t;
 117   int j = 4;
 118
 119   __builtin_prefetch (&t, 0, 0);
 120   __builtin_prefetch (pt, 0, 0);
 121   __builtin_prefetch (&t.b, 0, 0);
 122   __builtin_prefetch (&pt->b, 0, 0);
 123   __builtin_prefetch (&t.d, 0, 0);
 124   __builtin_prefetch (&pt->d, 0, 0);
 125   __builtin_prefetch (t.next, 0, 0);
 126   __builtin_prefetch (pt->next, 0, 0);
 127   __builtin_prefetch (t.next->d, 0, 0);
 128   __builtin_prefetch (pt->next->d, 0, 0);
 129
 130   __builtin_prefetch (&b, 0, 0);
 131   __builtin_prefetch (pb, 0, 0);
 132   __builtin_prefetch (&b[2], 0, 0);
 133   __builtin_prefetch (&pb[3], 0, 0);
 134   __builtin_prefetch (b+3, 0, 0);
 135   __builtin_prefetch (b+j, 0, 0);
 136   __builtin_prefetch (pb+5, 0, 0);
 137   __builtin_prefetch (pb+j, 0, 0);
 138 }
 139
 140 int
 141 main ()
 142 {
 143   simple_global ();
 144   simple_file ();
 145   simple_static_local ();
 146   simple_local ();
 147   simple_arg (glob_int_arr, glob_ptr_int, glob_int);
 148
 149   str.next = &str;
 150   expr_global ();
 151   expr_local ();
 152
 153   exit (0);
 154 }