Test S+lwsyncs

PPC S+lwsyncs
"LwSyncdWW Rfe LwSyncdRW Wse"
Cycle=Rfe LwSyncdRW Wse LwSyncdWW
{
0:r2=x; 0:r4=y;
1:r2=y; 1:r4=x;
}
 P0           | P1           ;
 li r1,2      | lwz r1,0(r2) ;
 stw r1,0(r2) | lwsync       ;
 lwsync       | li r3,1      ;
 li r3,1      | stw r3,0(r4) ;
 stw r3,0(r4) |              ;
exists
(x=2 /\ 1:r1=1)