Note: Due to technical difficulties, the Archives are currently not up to date.
GMANE provides an alternative service for most mailing lists. c.f. bug 424647
On Monday 22 November 2004 08:47, Matthew Groote-Kirsch wrote:
> I settled on:
>
> CFLAGS="-O2 -frename-registers -ftracer -funroll-loops
> -fomit-frame-pointer -pipe -march=athlon"
>
> Looking around on the forums a bit, it seemed like -O2 is recommended
> over -O3.
Aditionally there have been times when -O2 has been shown to be faster
than -O3. Similarly, the -funroll-loops might actually create slower code
due to more cache misses. Modern processors are complex systems where
nondeterministic parts like the cache can have a significant impact on
performance. The only real way to determine what is fastest would be to
run real-world (not simple loops) tests (with timing) for each option
combination.
Paul
--
Paul de Vrieze
Gentoo Developer
Mail: pauldv@g.o
Homepage: http://www.devrieze.net
|
|
