From:	jmamer AT anderson DOT ucla DOT edu (John Mamer)
Subject:	Re: Win 95 console business
7 Nov 1997 23:51:44 -0800 :
Message-ID:	<Pine.HPP.3.95q.971107233549.26145D-100000.cygnus.gnu-win32@risc.anderson.ucla.edu>
References:	<2 DOT 2 DOT 32 DOT 19971106160345 DOT 009935a8 AT ma DOT ultranet DOT com>
Mime-Version:	1.0
To:	Larry Hall <lhall AT rfk DOT com>
Cc:	Peter Boncz <boncz AT wins DOT uva DOT nl>, gnu-win32 AT cygnus DOT com

Hi!
  I haven't done anything like an exhaustive study, but I
did just happen to have the opportunity to run one of my
own programs using gcc and VC++.  The code was a linear
optimization code, similar in it's general structure to
sparse Gaussian elmination--lots of floating point, a
little disc I/O, nothing fancy. I the VC++ compiled code to
be about 30% faster than the gcc compiled version of the
code.
cheers
john


On Thu, 6 Nov 1997, Larry Hall wrote:

> At 01:43 PM 11/6/97 +0100, Peter Boncz wrote:
> >Hi there:
> >
> >Let me declare that I am totally uninterested i M$ bashing or holy wars,
> >but skimming over this message I saw the following remark:
> >
> >> And have you ever used VC++? It compiles faster and makes better code than
> >> gcc does (last time I looked) and it has a far nicer environment.
> >
> >My question to the net community: is this true, and how much is the
> >difference?? Has anyone compared the two on NT or even Win95?
> >
> >I know that the cygwin library adds overhead on top of WIN32 calls,
> >but apart from that, if you just look at a program spending CPU time
> >on reading/writing memory arrays and the like (i.e. little OS calls), 
> >what kind of performance difference typically comes out of
> >the same program being compiled with gcc -O3 and optimizing VC++?
> >
> >I mean, I always thought that gcc -O3 was pretty competitive, at 
> >least that is my experience with gcc on solaris in comparison
> >with the sun cc/CC.
> >
> 
> I've no experience with this myself but if I remember some other people's
> similar pursuits from the past correctly, differences where mostly of the 
> type that could be shifted one way or the other by setting a few more flags 
> or altering values of existing flags.  I came away with the impression that 
> gcc/g++ was competitive with VC++, each with slight advantages in different
> areas.  Someone else may have specifics that prove this not to be the case
> though....
> 
> Larry Hall                              lhall AT rfk DOT com
> RFK Partners, Inc.                      (781) 239-1053
> 8 Grove Street                          (781) 239-1655 - FAX
> Wellesley, MA  02181                             
> 
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