Subversion Repositories openrisc

/* Test that __builtin_prefetch does no harm.

   Data prefetch should not fault if used with an invalid address.  */

#include <limits.h>

#define ARRSIZE 65

int *bad_addr[ARRSIZE];

int arr_used;

/* Fill bad_addr with a range of values in the hopes that on any target

   some will be invalid addresses.  */

void

init_addrs (void)

{

  int i;

  int bits_per_ptr = sizeof (void *) * 8;

  for (i = 0; i < bits_per_ptr; i++)

    bad_addr[i] = (void *)(1UL << i);

  arr_used = bits_per_ptr + 1;  /* The last element used is zero.  */

}

void

prefetch_for_read (void)

{

  int i;

  for (i = 0; i < ARRSIZE; i++)

    __builtin_prefetch (bad_addr[i], 0, 0);

}

void

prefetch_for_write (void)

{

  int i;

  for (i = 0; i < ARRSIZE; i++)

    __builtin_prefetch (bad_addr[i], 1, 0);

}

int

main ()

{

  init_addrs ();

  prefetch_for_read ();

  prefetch_for_write ();

  exit (0);

}