GCC 4.0.0 Performance Regressions?

[Giovanni Bajo]

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