http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58234
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- > Can you tell me how it is possible to specify the clobber side effects without > requiring output constraints? It is too hard if you have inputs in those registers too. You could push/pop on the stack those registers if you want instead > Is it legal to specify output constraints without variables? No. >the useless movl instead of a movq of the updated address pointer into __d1 on >x86_64. That is due to use of int rather than long/long long but really one instruction is not an issue really and the resulting of that instruction is not used at all.
