Run S+isb+po in model, using armmem
ARM S+isb+po "ISBdWW Rfe PodRW Wse" Cycle=Rfe PodRW Wse ISBdWW { %x0=x; %y0=y; %y1=y; %x1=x; } P0 | P1 ; MOV R0, #2 | LDR R0, [%y1] ; STR R0, [%x0] | MOV R1, #1 ; ISB | STR R1, [%x1] ; MOV R1, #1 | ; STR R1, [%y0] | ; exists (x=2 /\ 1:R0=1)