Test IRIW+poacquireacquire+fencembonceonce+OnceRelease

LISA IRIW+poacquireacquire+fencembonceonce+OnceRelease
"RfeOnceAcquire PodRRAcquireAcquire FreAcquireRelease RfeReleaseOnce FenceMbdRROnceOnce FreOnceOnce"
Cycle=PodRRAcquireAcquire FreAcquireRelease RfeReleaseOnce FenceMbdRROnceOnce FreOnceOnce RfeOnceAcquire
Relax=FreAcquireRelease RfeOnceAcquire RfeReleaseOnce
Safe=PodRRAcquireAcquire FreOnceOnce FenceMbdRROnceOnce
Prefetch=1:x=F,1:y=T,3:y=F,3:x=T
Com=Rf Fr Rf Fr
Orig=RfeOnceAcquire PodRRAcquireAcquire FreAcquireRelease RfeReleaseOnce FenceMbdRROnceOnce FreOnceOnce
{
}
 P0          | P1              | P2             | P3           ;
 w[once] x 1 | r[acquire] r0 x | w[release] y 1 | r[once] r0 y ;
             | r[acquire] r1 y |                | f[mb]        ;
             |                 |                | r[once] r1 x ;
Observed
    3:r1=0; 3:r0=1; 1:r1=0; 1:r0=1;