1C S+poonceonces
 2
 3(*
 4 * Result: Sometimes
 5 *
 6 * Starting with a two-process release-acquire chain ordering P0()'s
 7 * first store against P1()'s final load, if the smp_store_release()
 8 * is replaced by WRITE_ONCE() and the smp_load_acquire() replaced by
 9 * READ_ONCE(), is ordering preserved?
10 *)
11
12{}
13
14P0(int *x, int *y)
15{
16	WRITE_ONCE(*x, 2);
17	WRITE_ONCE(*y, 1);
18}
19
20P1(int *x, int *y)
21{
22	int r0;
23
24	r0 = READ_ONCE(*y);
25	WRITE_ONCE(*x, 1);
26}
27
28exists (x=2 /\ 1:r0=1)