1 /* Test that __builtin_prefetch does no harm.
2
3 Use addresses that are unlikely to be word-aligned. Some targets
4 have alignment requirements for prefetch addresses, so make sure the
5 compiler takes care of that. This fails if it aborts, anything else
6 is OK. */
7
8 struct S {
9 short a;
10 short b;
11 char c[8];
12 } s;
13
14 char arr[100];
15 char *ptr = arr;
16 int idx = 3;
17
18 void
arg_ptr(char * p)19 arg_ptr (char *p)
20 {
21 __builtin_prefetch (p, 0, 0);
22 }
23
24 void
arg_idx(char * p,int i)25 arg_idx (char *p, int i)
26 {
27 __builtin_prefetch (&p[i], 0, 0);
28 }
29
30 void
glob_ptr(void)31 glob_ptr (void)
32 {
33 __builtin_prefetch (ptr, 0, 0);
34 }
35
36 void
glob_idx(void)37 glob_idx (void)
38 {
39 __builtin_prefetch (&ptr[idx], 0, 0);
40 }
41
42 int
main()43 main ()
44 {
45 __builtin_prefetch (&s.b, 0, 0);
46 __builtin_prefetch (&s.c[1], 0, 0);
47
48 arg_ptr (&s.c[1]);
49 arg_ptr (ptr+3);
50 arg_idx (ptr, 3);
51 arg_idx (ptr+1, 2);
52 idx = 3;
53 glob_ptr ();
54 glob_idx ();
55 ptr++;
56 idx = 2;
57 glob_ptr ();
58 glob_idx ();
59 exit (0);
60 }
61