builtin-prefetch-1.c [plain text]
extern void exit (int);
enum locality { none, low, moderate, high, bogus };
enum rw { read, write };
int arr[10];
void
good (int *p)
{
__builtin_prefetch (p, 0, 0);
__builtin_prefetch (p, 0, 1);
__builtin_prefetch (p, 0, 2);
__builtin_prefetch (p, 0, 3);
__builtin_prefetch (p, 1, 0);
__builtin_prefetch (p, 1, 1);
__builtin_prefetch (p, 1, 2);
__builtin_prefetch (p, 1, 3);
}
void
bad (int *p)
{
__builtin_prefetch (p, -1, 0);
__builtin_prefetch (p, 2, 0);
__builtin_prefetch (p, bogus, 0);
__builtin_prefetch (p, 0, -1);
__builtin_prefetch (p, 0, 4);
__builtin_prefetch (p, 0, bogus);
}
int
main ()
{
good (arr);
bad (arr);
exit (0);
}