builtin-prefetch-6.c [plain text]
#include <limits.h>
#define ARRSIZE 65
int *bad_addr[ARRSIZE];
int arr_used;
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;
}
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);
}