ARM S+dsb+isb "DSBdWW Rfe ISBdRW Wse" Cycle=Rfe ISBdRW Wse DSBdWW { %x0=x; %y0=y; %y1=y; %x1=x; } P0 | P1 ; MOV R0, #2 | LDR R0, [%y1] ; STR R0, [%x0] | ISB ; DSB | MOV R1, #1 ; MOV R1, #1 | STR R1, [%x1] ; STR R1, [%y0] | ; Observed 1:R0=1; x=2;