PPC safe416 "SyncsWR Fre SyncdWW Rfe SyncdRR Fre" Cycle=SyncsWR Fre SyncdWW Rfe SyncdRR Fre Relax= Safe=Fre SyncsWR SyncdRR BCSyncdWW { 0:r2=y; 0:r4=x; 1:r2=x; 1:r4=y; 2:r2=y; } P0 | P1 | P2 ; li r1,2 | lwz r1,0(r2) | li r1,1 ; stw r1,0(r2) | sync | stw r1,0(r2) ; sync | lwz r3,0(r4) | sync ; li r3,1 | | lwz r3,0(r2) ; stw r3,0(r4) | | ; exists (y=2 /\ 1:r1=1 /\ 1:r3=0 /\ 2:r3=1)