rs_set_end_raw
rs_set_end_raw(&newseg, rt, rs_get_end_raw(rs, rt));
rs_set_end_raw(&rsearch, rt, rs_get_start_raw(&rsearch, rt) + 1);
rs_set_end_raw(&starting_rs, removefrom, rs_get_start_raw(&starting_rs,
rs_set_end_raw(rs, rt, (end - rt->rt_start) >> rt->rt_shift);