PPC WRC+lwsync+isync "Rfe LwSyncdRW Rfe ISyncdRR Fre" Cycle=Rfe LwSyncdRW Rfe ISyncdRR 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) | lwz r1,0(r2) ; stw r1,0(r2) | lwsync | isync ; | li r3,1 | lwz r3,0(r4) ; | stw r3,0(r4) | ; exists (1:r1=1 /\ 2:r1=1 /\ 2:r3=0)