PPC LB+lwsync+data "LwSyncdRW Rfe DpDatadW Rfe" Cycle=Rfe LwSyncdRW Rfe DpDatadW { 0:r2=x; 0:r4=y; 1:r2=y; 1:r4=x; } P0 | P1 ; lwz r1,0(r2) | lwz r1,0(r2) ; lwsync | xor r3,r1,r1 ; li r3,1 | addi r3,r3,1 ; stw r3,0(r4) | stw r3,0(r4) ; exists (0:r1=1 /\ 1:r1=1)