[boost] Re: performance using accumulate, bind, and make_transform_iterator

From: David Abrahams (dave_at_[hidden])
Date: 2004-11-13 10:08:01

Valentin Samko <boost_at_[hidden]> writes:

> RN> Do you have specific advice/experience for Linux's g++ that might improve or
> RN> explain what we're seeing here?
>
> g++ does NRVO, which some popular optimising compilers (like VC++ 7.1)
> do not do. In my experience, some programs compiled with g++ are
> noticeably faster than when compiled with vc++ 7.1, mainly due to the
> NRVO. Afaik, NRVO it not implemented in VC++ 7.1 because it conflicts
> with the current C++ standard (3.7.2).

What makes you think it conflicts with the C++ standard?

Anyway, nothing you can say in favor of G++'s optimization
capabilities will help the OP improve or explain the slowdowns he's
seeing, will it?

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com