old-autovect-branch/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-6.c

   1 /* Test that __builtin_prefetch does no harm.
   2
   3    Data prefetch should not fault if used with an invalid address.  */
   4
   5 #include <limits.h>
   6
   7 #define ARRSIZE 65
   8 int *bad_addr[ARRSIZE];
   9 int arr_used;
  10
  11 /* Fill bad_addr with a range of values in the hopes that on any target
  12    some will be invalid addresses.  */
  13 void
  14 init_addrs (void)
  15 {
  16   int i;
  17   int bits_per_ptr = sizeof (void *) * 8;
  18   for (i = 0; i < bits_per_ptr; i++)
  19     bad_addr[i] = (void *)(1UL << i);
  20   arr_used = bits_per_ptr + 1;  /* The last element used is zero.  */
  21 }
  22
  23 void
  24 prefetch_for_read (void)
  25 {
  26   int i;
  27   for (i = 0; i < ARRSIZE; i++)
  28     __builtin_prefetch (bad_addr[i], 0, 0);
  29 }
  30
  31 void
  32 prefetch_for_write (void)
  33 {
  34   int i;
  35   for (i = 0; i < ARRSIZE; i++)
  36     __builtin_prefetch (bad_addr[i], 1, 0);
  37 }
  38
  39 int
  40 main ()
  41 {
  42   init_addrs ();
  43   prefetch_for_read ();
  44   prefetch_for_write ();
  45   exit (0);
  46 }