| /* 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); |
| } |