https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113744
--- Comment #3 from kong lingling <lingling.kong7 at gmail dot com> --- *add<mode>_4 and *adddi_4 are for shorter opcode from cmp to inc/dec or add $128. But NDD code is longer than the cmp code, so there is no need to support ndd.
