PPC IRIW+lwsync+po "Rfe LwSyncdRR Fre Rfe PodRR Fre" Cycle=Rfe PodRR Fre Rfe LwSyncdRR Fre { 0:r2=x; 1:r2=x; 1:r4=y; 2:r2=y; 3:r2=y; 3:r4=x; } P0 | P1 | P2 | P3 ; li r1,1 | lwz r1,0(r2) | li r1,1 | lwz r1,0(r2) ; stw r1,0(r2) | lwsync | stw r1,0(r2) | lwz r3,0(r4) ; | lwz r3,0(r4) | | ; exists (1:r1=1 /\ 1:r3=0 /\ 3:r1=1 /\ 3:r3=0)