PPC safe196 "SyncdWW Rfe SyncsRW Rfe LwSyncdRW Wse" Cycle=SyncdWW Rfe SyncsRW Rfe LwSyncdRW Wse Relax= Safe=Wse LwSyncdRW BCSyncsRW BCSyncdWW { 0:r2=x; 1:r2=x; 1:r4=y; 2:r2=y; 2:r4=x; } P0 | P1 | P2 ; lwz r1,0(r2) | lwz r1,0(r2) | li r1,2 ; sync | lwsync | stw r1,0(r2) ; li r3,2 | li r3,1 | sync ; stw r3,0(r2) | stw r3,0(r4) | li r3,1 ; | | stw r3,0(r4) ; exists (x=2 /\ y=2 /\ 0:r1=1 /\ 1:r1=2)