1C dep+plain
 2
 3(*
 4 * Result: Never
 5 *
 6 * This litmus test demonstrates that in LKMM, plain accesses
 7 * carry dependencies much like accesses to registers:
 8 * The data stored to *z1 and *z2 by P0() originates from P0()'s
 9 * READ_ONCE(), and therefore using that data to compute the
10 * conditional of P0()'s if-statement creates a control dependency
11 * from that READ_ONCE() to P0()'s WRITE_ONCE().
12 *)
13
14{}
15
16P0(int *x, int *y, int *z1, int *z2)
17{
18	int a = READ_ONCE(*x);
19	*z1 = a;
20	*z2 = *z1;
21	if (*z2 == 1)
22		WRITE_ONCE(*y, 1);
23}
24
25P1(int *x, int *y)
26{
27	int r = smp_load_acquire(y);
28	smp_store_release(x, r);
29}
30
31exists (x=1 /\ y=1)