PPC safe011 "SyncdWW Rfe DpdW Wse" Cycle=SyncdWW Rfe DpdW Wse Relax= Safe=Wse DpdW BCSyncdWW { 0:r2=x; 0:r5=y; 1:r2=y; 1:r4=x; } P0 | P1 ; lwz r1,0(r2) | li r1,2 ; xor r3,r1,r1 | stw r1,0(r2) ; li r4,1 | sync ; stwx r4,r3,r5 | li r3,1 ; | stw r3,0(r4) ; exists (y=2 /\ 0:r1=1)