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Re: GCC 4.0.0 Performance Regressions?
- From: "Giovanni Bajo" <giovannibajo at libero dot it>
- To: "Jason Bucata" <jbucata at tulsaconnect dot com>
- Cc: <gcc at gcc dot gnu dot org>
- Date: Tue, 10 May 2005 02:04:37 +0200
- Subject: Re: GCC 4.0.0 Performance Regressions?
- References: <20050509223233.GA7649@tulsaconnect.com>
Jason Bucata <jbucata@tulsaconnect.com> wrote:
> Is anybody collecting information on performance regressions in 4.0.0
> (vs.
> 3.4.3)? I've got some results on POVRAY and BYTEmark, and BYTEmark
> saw some performance regression, particularly with profiled
> optimization (-fprofile-{generate,use}):
> http://forums.gentoo.org/viewtopic-t-329765.html
You should try and isolate a single BYTEmark test which shows the biggest
regression. It's better if you manage to pack the whole test as a single
preprocessed source file. Theoretically, this file should be compilable and
linkable, and the resulting binary should run for a while doing computations.
With this kind of help, we can analyze the regression and see why it's slower
with 4.0.0.
Giovanni Bajo