Viewing file:  builtin-prefetch-3.c (3.61 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* Test that __builtin_prefetch does no harm.
Prefetch data using a variety of storage classes and address
expressions with volatile variables and pointers. */
int glob_int_arr[100];
int glob_int = 4;
volatile int glob_vol_int_arr[100];
int * volatile glob_vol_ptr_int = glob_int_arr;
volatile int *glob_ptr_vol_int = glob_vol_int_arr;
volatile int * volatile glob_vol_ptr_vol_int = glob_vol_int_arr;
volatile int glob_vol_int;
static stat_int_arr[100];
static volatile int stat_vol_int_arr[100];
static int * volatile stat_vol_ptr_int = stat_int_arr;
static volatile int *stat_ptr_vol_int = stat_vol_int_arr;
static volatile int * volatile stat_vol_ptr_vol_int = stat_vol_int_arr;
static volatile int stat_vol_int;
struct S {
int a;
short b, c;
char d[8];
struct S *next;
};
struct S str;
volatile struct S vol_str;
struct S * volatile vol_ptr_str = &str;
volatile struct S *ptr_vol_str = &vol_str;
volatile struct S * volatile vol_ptr_vol_str = &vol_str;
/* Prefetch volatile global variables using the address of the variable. */
void
simple_vol_global ()
{
__builtin_prefetch (glob_vol_int_arr, 0, 0);
__builtin_prefetch (glob_vol_ptr_int, 0, 0);
__builtin_prefetch (glob_ptr_vol_int, 0, 0);
__builtin_prefetch (glob_vol_ptr_vol_int, 0, 0);
__builtin_prefetch (&glob_vol_int, 0, 0);
}
/* Prefetch volatile static variables using the address of the variable. */
void
simple_vol_file ()
{
__builtin_prefetch (stat_vol_int_arr, 0, 0);
__builtin_prefetch (stat_vol_ptr_int, 0, 0);
__builtin_prefetch (stat_ptr_vol_int, 0, 0);
__builtin_prefetch (stat_vol_ptr_vol_int, 0, 0);
__builtin_prefetch (&stat_vol_int, 0, 0);
}
/* Prefetch using address expressions involving volatile global variables. */
void
expr_vol_global (void)
{
__builtin_prefetch (&vol_str, 0, 0);
__builtin_prefetch (ptr_vol_str, 0, 0);
__builtin_prefetch (vol_ptr_str, 0, 0);
__builtin_prefetch (vol_ptr_vol_str, 0, 0);
__builtin_prefetch (&vol_str.b, 0, 0);
__builtin_prefetch (&ptr_vol_str->b, 0, 0);
__builtin_prefetch (&vol_ptr_str->b, 0, 0);
__builtin_prefetch (&vol_ptr_vol_str->b, 0, 0);
__builtin_prefetch (&vol_str.d, 0, 0);
__builtin_prefetch (&vol_ptr_str->d, 0, 0);
__builtin_prefetch (&ptr_vol_str->d, 0, 0);
__builtin_prefetch (&vol_ptr_vol_str->d, 0, 0);
__builtin_prefetch (vol_str.next, 0, 0);
__builtin_prefetch (vol_ptr_str->next, 0, 0);
__builtin_prefetch (ptr_vol_str->next, 0, 0);
__builtin_prefetch (vol_ptr_vol_str->next, 0, 0);
__builtin_prefetch (vol_str.next->d, 0, 0);
__builtin_prefetch (vol_ptr_str->next->d, 0, 0);
__builtin_prefetch (ptr_vol_str->next->d, 0, 0);
__builtin_prefetch (vol_ptr_vol_str->next->d, 0, 0);
__builtin_prefetch (&glob_vol_int_arr, 0, 0);
__builtin_prefetch (glob_vol_ptr_int, 0, 0);
__builtin_prefetch (glob_ptr_vol_int, 0, 0);
__builtin_prefetch (glob_vol_ptr_vol_int, 0, 0);
__builtin_prefetch (&glob_vol_int_arr[2], 0, 0);
__builtin_prefetch (&glob_vol_ptr_int[3], 0, 0);
__builtin_prefetch (&glob_ptr_vol_int[3], 0, 0);
__builtin_prefetch (&glob_vol_ptr_vol_int[3], 0, 0);
__builtin_prefetch (glob_vol_int_arr+3, 0, 0);
__builtin_prefetch (glob_vol_int_arr+glob_vol_int, 0, 0);
__builtin_prefetch (glob_vol_ptr_int+5, 0, 0);
__builtin_prefetch (glob_ptr_vol_int+5, 0, 0);
__builtin_prefetch (glob_vol_ptr_vol_int+5, 0, 0);
__builtin_prefetch (glob_vol_ptr_int+glob_vol_int, 0, 0);
__builtin_prefetch (glob_ptr_vol_int+glob_vol_int, 0, 0);
__builtin_prefetch (glob_vol_ptr_vol_int+glob_vol_int, 0, 0);
}
int
main ()
{
simple_vol_global ();
simple_vol_file ();
str.next = &str;
vol_str.next = &str;
expr_vol_global ();
exit (0);
}
|
