https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92729
--- Comment #3 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> --- (In reply to Max from comment #2) > Is there anyone more familiar with GCC internals and/or the AVR backend who > I would be able to consult or possibly work with on this? I think Jeff Law mentioned on the gcc-patches mailing list that he would be willing to answer questions and assist anyone willing to work on MODE_CC conversion. So, I would ask on the list: https://gcc.gnu.org/mailman/listinfo/gcc-patches