std::copy() optimization, gcc vs clang

[Oleg Endo]

Hello,

On Tue, 2013-11-19 at 17:05 +0400, niXman wrote:
> Hi,
> 
> I'm curious the thoughts of GCC developers about this topic:
> http://stackoverflow.com/questions/13128430/why-is-stdcopy-5x-slower-than-memcpy-in-my-test-program
> 
> 
> Clang in this case optimizing better than GCC.
> Is there any reason why GCC does not perform the same optimization?

Probably nobody has noticed or reported it yet.
Thanks for reporting this.

I've created a PR for this issue:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59209
See the PR description for a reduced test case and some more detailed
explanation.

Cheers,
Oleg