Run LB+datas in model, using ppcmem
PPC LB+datas "DpDatadW Rfe DpDatadW Rfe" Cycle=Rfe DpDatadW Rfe DpDatadW { 0:r2=x; 0:r4=y; 1:r2=y; 1:r4=x; } P0 | P1 ; lwz r1,0(r2) | lwz r1,0(r2) ; xor r3,r1,r1 | xor r3,r1,r1 ; addi r3,r3,1 | addi r3,r3,1 ; stw r3,0(r4) | stw r3,0(r4) ; ~exists (0:r1=1 /\ 1:r1=1)