[Bug libstdc++/47913] [C++0x] improve ratio_add to overflow less often

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47913

--- Comment #12 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-03-02 12:07:13 UTC ---
About int/long/long long I see what you mean, but we should double check that
__builtin_clzll is unconditionally available and the same as __builtin_clz if
intmax_t == int (etc): at the moment I'm not 100% sure.