Nicolas Calimet wrote:
>>>maybe more.
> 
> 
>         I was told recently that using profiling-guided optimization could
> also somewhat increase performance on Athlon's.  To do so, you have to
> compile an intermediate binary using "-fprofile-arcs", then run a
> (representative) set of povray scenes, and recompile again this time
> with "-fbranch-probabilities" instead of the option above.
>         Personnaly I had some oddities doing so with gcc-3.4.0 on the
> current POV-Ray 3.6 sources, and the speedup was also negligible.

With gcc 3.4.0 you can use profiling based optimizations with 
-fprofile-generate and -fprofile-use.

Christoph

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