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 extern void exit (int);
   9
  10 enum locality { none, low, moderate, high, bogus };
  11 enum rw { read, write };
  12
  13 int arr[10];
  14
  15 void
  16 good (int *p)
  17 {
  18   __builtin_prefetch (p, 0, 0);
  19   __builtin_prefetch (p, 0, 1);
  20   __builtin_prefetch (p, 0, 2);
  21   __builtin_prefetch (p, 0, 3);
  22   __builtin_prefetch (p, 1, 0);
  23   __builtin_prefetch (p, 1, 1);
  24   __builtin_prefetch (p, 1, 2);
  25   __builtin_prefetch (p, 1, 3);
  26 }
  27
  28 void
  29 bad (int *p)
  30 {
  31   __builtin_prefetch (p, -1, 0);  /* { dg-warning "invalid second argument to '__builtin_prefetch'; using zero" } */
  32   __builtin_prefetch (p, 2, 0);   /* { dg-warning "invalid second argument to '__builtin_prefetch'; using zero" } */
  33   __builtin_prefetch (p, bogus, 0);   /* { dg-warning "invalid second argument to '__builtin_prefetch'; using zero" } */
  34   __builtin_prefetch (p, 0, -1);  /* { dg-warning "invalid third argument to '__builtin_prefetch'; using zero" } */
  35   __builtin_prefetch (p, 0, 4);   /* { dg-warning "invalid third argument to '__builtin_prefetch'; using zero" } */
  36   __builtin_prefetch (p, 0, bogus);   /* { dg-warning "invalid third argument to '__builtin_prefetch'; using zero" } */
  37 }
  38
  39 int
  40 main ()
  41 {
  42   good (arr);
  43   bad (arr);
  44   exit (0);
  45 }