gcc/testsuite/gcc.dg/builtin-prefetch-1.c

   1 /* Test that __builtin_prefetch does no harm.
   2
   3    Prefetch using some invalid rw and locality values.  These must be
   4    compile-time constants.  */
   5
   6 /* { dg-do run } */
   7
   8 enum locality { none, low, moderate, high, bogus };
   9 enum rw { read, write };
  10
  11 int arr[10];
  12
  13 void
  14 good (int *p)
  15 {
  16   __builtin_prefetch (p, 0, 0);
  17   __builtin_prefetch (p, 0, 1);
  18   __builtin_prefetch (p, 0, 2);
  19   __builtin_prefetch (p, 0, 3);
  20   __builtin_prefetch (p, 1, 0);
  21   __builtin_prefetch (p, 1, 1);
  22   __builtin_prefetch (p, 1, 2);
  23   __builtin_prefetch (p, 1, 3);
  24 }
  25
  26 void
  27 bad (int *p)
  28 {
  29   __builtin_prefetch (p, -1, 0);  /* { dg-warning "invalid second arg to __builtin_prefetch; using zero" } */
  30   __builtin_prefetch (p, 2, 0);   /* { dg-warning "invalid second arg to __builtin_prefetch; using zero" } */
  31   __builtin_prefetch (p, bogus, 0);   /* { dg-warning "invalid second arg to __builtin_prefetch; using zero" } */
  32   __builtin_prefetch (p, 0, -1);  /* { dg-warning "invalid third arg to __builtin_prefetch; using zero" } */
  33   __builtin_prefetch (p, 0, 4);   /* { dg-warning "invalid third arg to __builtin_prefetch; using zero" } */
  34   __builtin_prefetch (p, 0, bogus);   /* { dg-warning "invalid third arg to __builtin_prefetch; using zero" } */
  35 }
  36
  37 int
  38 main ()
  39 {
  40   good (arr);
  41   bad (arr);
  42   exit (0);
  43 }