PPC safe468 "SyncsWW Rfe SyncdRW Rfe LwSyncdRR Fre" Cycle=SyncsWW Rfe SyncdRW Rfe LwSyncdRR Fre Relax= Safe=Fre LwSyncdRR BCSyncsWW BCSyncdRW { 0:r2=y; 0:r4=x; 1:r2=x; 1:r4=y; 2:r2=y; } P0 | P1 | P2 ; lwz r1,0(r2) | lwz r1,0(r2) | li r1,1 ; sync | lwsync | stw r1,0(r2) ; li r3,1 | lwz r3,0(r4) | sync ; stw r3,0(r4) | | li r3,2 ; | | stw r3,0(r2) ; exists (y=2 /\ 0:r1=2 /\ 1:r1=1 /\ 1:r3=0)