[Bug libstdc++/51078] [PATCH] performance improvement of std::count algorithm

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51078

--- Comment #16 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-11-12 12:11:48 UTC ---
By the way, without having investigated at all what the optimizers are actually
doing, in mainline, on an i7-980X I have here at hand I don't see the manual
unrolling providing any advantage over -funroll-loops: I'm using  g++ -Ofast
-march=native -funroll-loops test.cc. Numbers attached.