http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57003
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-23 16:00:52 UTC --- But __builtin_memcpy isn't necessarily the inline memcpy code, it can very well be a library call too. Anyway, this bugreport doesn't have a preprocessed source attached to it, nor list of all gcc options to compile it, so there is nothing to look at.