PPC safe519 "SyncdWW Rfe DpsW Rfe SyncdRR Fre" Cycle=SyncdWW Rfe DpsW Rfe SyncdRR Fre Relax= Safe=Fre DpsW ACSyncdRR 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 r1,1 ; xor r3,r1,r1 | sync | stw r1,0(r2) ; li r4,2 | lwz r3,0(r4) | sync ; stwx r4,r3,r2 | | li r3,1 ; | | stw r3,0(r4) ; exists (x=2 /\ 0:r1=1 /\ 1:r1=2 /\ 1:r3=0)