| /* Test that __builtin_prefetch does no harm. |
| |
| Prefetch data using a variety of storage classes and address |
| expressions. */ |
| |
| int glob_int_arr[100]; |
| int *glob_ptr_int = glob_int_arr; |
| int glob_int = 4; |
| |
| static stat_int_arr[100]; |
| static int *stat_ptr_int = stat_int_arr; |
| static int stat_int; |
| |
| struct S { |
| int a; |
| short b, c; |
| char d[8]; |
| struct S *next; |
| }; |
| |
| struct S str; |
| struct S *ptr_str = &str; |
| |
| /* Prefetch global variables using the address of the variable. */ |
| |
| void |
| simple_global () |
| { |
| __builtin_prefetch (glob_int_arr, 0, 0); |
| __builtin_prefetch (glob_ptr_int, 0, 0); |
| __builtin_prefetch (&glob_int, 0, 0); |
| } |
| |
| /* Prefetch file-level static variables using the address of the variable. */ |
| |
| void |
| simple_file () |
| { |
| __builtin_prefetch (stat_int_arr, 0, 0); |
| __builtin_prefetch (stat_ptr_int, 0, 0); |
| __builtin_prefetch (&stat_int, 0, 0); |
| } |
| |
| /* Prefetch local static variables using the address of the variable. */ |
| |
| void |
| simple_static_local () |
| { |
| static int gx[100]; |
| static int *hx = gx; |
| static int ix; |
| __builtin_prefetch (gx, 0, 0); |
| __builtin_prefetch (hx, 0, 0); |
| __builtin_prefetch (&ix, 0, 0); |
| } |
| |
| /* Prefetch local stack variables using the address of the variable. */ |
| |
| void |
| simple_local () |
| { |
| int gx[100]; |
| int *hx = gx; |
| int ix; |
| __builtin_prefetch (gx, 0, 0); |
| __builtin_prefetch (hx, 0, 0); |
| __builtin_prefetch (&ix, 0, 0); |
| } |
| |
| /* Prefetch arguments using the address of the variable. */ |
| |
| void |
| simple_arg (int g[100], int *h, int i) |
| { |
| __builtin_prefetch (g, 0, 0); |
| __builtin_prefetch (h, 0, 0); |
| __builtin_prefetch (&i, 0, 0); |
| } |
| |
| /* Prefetch using address expressions involving global variables. */ |
| |
| void |
| expr_global (void) |
| { |
| __builtin_prefetch (&str, 0, 0); |
| __builtin_prefetch (ptr_str, 0, 0); |
| __builtin_prefetch (&str.b, 0, 0); |
| __builtin_prefetch (&ptr_str->b, 0, 0); |
| __builtin_prefetch (&str.d, 0, 0); |
| __builtin_prefetch (&ptr_str->d, 0, 0); |
| __builtin_prefetch (str.next, 0, 0); |
| __builtin_prefetch (ptr_str->next, 0, 0); |
| __builtin_prefetch (str.next->d, 0, 0); |
| __builtin_prefetch (ptr_str->next->d, 0, 0); |
| |
| __builtin_prefetch (&glob_int_arr, 0, 0); |
| __builtin_prefetch (glob_ptr_int, 0, 0); |
| __builtin_prefetch (&glob_int_arr[2], 0, 0); |
| __builtin_prefetch (&glob_ptr_int[3], 0, 0); |
| __builtin_prefetch (glob_int_arr+3, 0, 0); |
| __builtin_prefetch (glob_int_arr+glob_int, 0, 0); |
| __builtin_prefetch (glob_ptr_int+5, 0, 0); |
| __builtin_prefetch (glob_ptr_int+glob_int, 0, 0); |
| } |
| |
| /* Prefetch using address expressions involving local variables. */ |
| |
| void |
| expr_local (void) |
| { |
| int b[10]; |
| int *pb = b; |
| struct S t; |
| struct S *pt = &t; |
| int j = 4; |
| |
| __builtin_prefetch (&t, 0, 0); |
| __builtin_prefetch (pt, 0, 0); |
| __builtin_prefetch (&t.b, 0, 0); |
| __builtin_prefetch (&pt->b, 0, 0); |
| __builtin_prefetch (&t.d, 0, 0); |
| __builtin_prefetch (&pt->d, 0, 0); |
| __builtin_prefetch (t.next, 0, 0); |
| __builtin_prefetch (pt->next, 0, 0); |
| __builtin_prefetch (t.next->d, 0, 0); |
| __builtin_prefetch (pt->next->d, 0, 0); |
| |
| __builtin_prefetch (&b, 0, 0); |
| __builtin_prefetch (pb, 0, 0); |
| __builtin_prefetch (&b[2], 0, 0); |
| __builtin_prefetch (&pb[3], 0, 0); |
| __builtin_prefetch (b+3, 0, 0); |
| __builtin_prefetch (b+j, 0, 0); |
| __builtin_prefetch (pb+5, 0, 0); |
| __builtin_prefetch (pb+j, 0, 0); |
| } |
| |
| int |
| main () |
| { |
| simple_global (); |
| simple_file (); |
| simple_static_local (); |
| simple_local (); |
| simple_arg (glob_int_arr, glob_ptr_int, glob_int); |
| |
| str.next = &str; |
| expr_global (); |
| expr_local (); |
| |
| exit (0); |
| } |