PPC safe501 "Rfe SyncdRW Rfe SyncdRW Rfe SyncsRR Fre" Cycle=Rfe SyncdRW Rfe SyncdRW Rfe SyncsRR Fre Relax= Safe=Fre ACSyncsRR ACSyncdRW { 0:r2=y; 0:r4=x; 1:r2=x; 1:r4=y; 2:r2=y; 3:r2=y; } P0 | P1 | P2 | P3 ; lwz r1,0(r2) | lwz r1,0(r2) | lwz r1,0(r2) | li r1,2 ; sync | sync | sync | stw r1,0(r2) ; li r3,1 | li r3,1 | lwz r3,0(r2) | ; stw r3,0(r4) | stw r3,0(r4) | | ; exists (y=2 /\ 0:r1=2 /\ 1:r1=1 /\ 2:r1=1 /\ 2:r3=1)