Run S+lwsync+ctrlisync in model, using ppcmem
PPC S+lwsync+ctrlisync "LwSyncdWW Rfe DpCtrlIsyncdW Wse" Cycle=Rfe DpCtrlIsyncdW Wse LwSyncdWW { 0:r2=x; 0:r4=y; 1:r2=y; 1:r4=x; } P0 | P1 ; li r1,2 | lwz r1,0(r2) ; stw r1,0(r2) | cmpw r1,r1 ; lwsync | beq LC00 ; li r3,1 | LC00: ; stw r3,0(r4) | isync ; | li r3,1 ; | stw r3,0(r4) ; exists (x=2 /\ 1:r1=1)