gen_ahostop
b0 = gen_ahostop(eaddr, Q_SRC);
b1 = gen_ahostop(eaddr, Q_DST);
b0 = gen_ahostop(eaddr, Q_SRC);
b1 = gen_ahostop(eaddr, Q_DST);
return gen_ahostop(eaddr, (int)q.dir);