https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59401
--- Comment #10 from Oleg Endo <olegendo at gcc dot gnu.org> --- (In reply to Kazumoto Kojima from comment #9) > (In reply to Oleg Endo from comment #8) > > change the > > value for gbr in sh.h CALL_USED_REGISTERS from '1' to '0' and confirm that > > everything is still OK? > > The comment and document about CALL_USED_REGISTERS say that it must be > a superset of FIXED_REGISTERS. CALL_REALLY_USED_REGISTERS might be > a macro for that purpose. Right. In this case it's probably better to do it in sh_conditional_register_usage. It would be nice if '-fcall-saved-gbr' and '-fcall-used-gbr' still remained functional afterwards ... I'll give it a try.
