DD_SAVED_NEXT
nd_bsw4(DD_SAVED_NEXT, dd_saved_next);
|| (!turbo && (nd_bsr4(DD_SAVED_NEXT) != dd_saved_next))
dd_saved_next = nd_bsr4(DD_SAVED_NEXT);
#define DD_SAVED_LIMIT (DD_SAVED_NEXT + sizeof(char *))