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