PPC WRW+WR+lwsyncs "Rfe LwSyncdRW Wse LwSyncdWR Fre" Cycle=Rfe LwSyncdRW Wse LwSyncdWR Fre { 0:r2=x; 1:r2=x; 1:r4=y; 2:r2=y; 2:r4=x; } P0 | P1 | P2 ; li r1,1 | lwz r1,0(r2) | li r1,2 ; stw r1,0(r2) | lwsync | stw r1,0(r2) ; | li r3,1 | lwsync ; | stw r3,0(r4) | lwz r3,0(r4) ; exists (y=2 /\ 1:r1=1 /\ 2:r3=0)