PPC bclwdww019 "DpdR Fre LwSyncdWW Rfe" Cycle=DpdR Fre LwSyncdWW Rfe Relax=BCLwSyncdWW Safe=Fre DpdR { 0:r2=x; 0:r4=y; 1:r2=y; 1:r5=x; } P0 | P1 ; li r1,1 | lwz r1,0(r2) ; stw r1,0(r2) | xor r3,r1,r1 ; lwsync | lwzx r4,r3,r5 ; li r3,1 | ; stw r3,0(r4) | ; exists (1:r1=1 /\ 1:r4=0)