http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49813
--- Comment #23 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2011-07-22 16:48:35 UTC --- would http://lwg.github.com/issues/lwg-active.html#2013 allow gcc to declare constexpr the x86 builtins (and corresponding wrapper functions)? I would be interested to have constepxr vectors (__m128 etc)