[boost] Re: uBlas and linear algebra questions

From: David Abrahams (dave_at_[hidden])
Date: 2003-07-26 12:03:36

Kresimir Fresl <fresl_at_[hidden]> writes:

> David Abrahams wrote:
>
>> Kirill Lapshin <kir_at_[hidden]> writes:
>
>>>Atlas docs mentioned that it is possible to build atlas with msvc, but
>>>no build procedure available, so it is tricky; also resulting library
>>>going to be slower then one built with cygwin.
>
>> Really? MSVC's optimizer is generally better than GCC's.
>
> http://math-atlas.sourceforge.net/errata.html#WhatComp

Well, that's self contradictory!

     "using a gcc version newer than 2.95.x (including the various
     RedHat compilers from 7.0 on) results in a 50% performance drop
     for Athlons, and 25% drop for Pentium III"

     ...

     "As of this writing, there is one gcc version which works best on
     all platforms we know of other than UltraSparcs: gcc 3.1."

Also, I'm strongly suspicious that they only tested with vc6 and not
with vc7.1.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com