extern int mmix_shiftable_wyde_value (unsigned HOST_WIDEST_INT);
extern void mmix_output_register_setting (FILE *, int, HOST_WIDEST_INT, int);
extern void mmix_conditional_register_usage (void);
+extern int mmix_opposite_regno (int, int);
extern int mmix_local_regno (int);
extern int mmix_dbx_register_number (int);
extern int mmix_use_simple_return (void);