ARM MP+dsb+isb "DSBdWW Rfe ISBdRR Fre" Cycle=Rfe ISBdRR Fre DSBdWW { %x0=x; %y0=y; %y1=y; %x1=x; } P0 | P1 ; MOV R0, #1 | LDR R0, [%y1] ; STR R0, [%x0] | ISB ; DSB | LDR R1, [%x1] ; MOV R1, #1 | ; STR R1, [%y0] | ; Observed 1:R0=1; 1:R1=0;