gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-5.c

   1 /* Test that __builtin_prefetch does no harm.
   2
   3    Use addresses that are unlikely to be word-aligned.  Some targets
   4    have alignment requirements for prefetch addresses, so make sure the
   5    compiler takes care of that.  This fails if it aborts, anything else
   6    is OK.  */
   7
   8 void exit (int);
   9
  10 struct S {
  11   short a;
  12   short b;
  13   char c[8];
  14 } s;
  15
  16 char arr[100];
  17 char *ptr = arr;
  18 int idx = 3;
  19
  20 void
  21 arg_ptr (char *p)
  22 {
  23   __builtin_prefetch (p, 0, 0);
  24 }
  25
  26 void
  27 arg_idx (char *p, int i)
  28 {
  29   __builtin_prefetch (&p[i], 0, 0);
  30 }
  31
  32 void
  33 glob_ptr (void)
  34 {
  35   __builtin_prefetch (ptr, 0, 0);
  36 }
  37
  38 void
  39 glob_idx (void)
  40 {
  41   __builtin_prefetch (&ptr[idx], 0, 0);
  42 }
  43
  44 int
  45 main ()
  46 {
  47   __builtin_prefetch (&s.b, 0, 0);
  48   __builtin_prefetch (&s.c[1], 0, 0);
  49
  50   arg_ptr (&s.c[1]);
  51   arg_ptr (ptr+3);
  52   arg_idx (ptr, 3);
  53   arg_idx (ptr+1, 2);
  54   idx = 3;
  55   glob_ptr ();
  56   glob_idx ();
  57   ptr++;
  58   idx = 2;
  59   glob_ptr ();
  60   glob_idx ();
  61   exit (0);
  62 }