i686 ---> i586, i386 ---> i586, x86_64 stays the same
Bill Nottingham
notting at redhat.com
Mon Apr 6 15:17:30 UTC 2009
Jakub Jelinek (jakub at redhat.com) said:
> > Actually, in some testing I did, the fasted was '-march=i686
> > -mtune=generic' (which was ~1% faster than '-march=i586 -mtune=generic'),
> > tested across Core2Duo, Athlon64, and Atom.
> >
> > Twiddling the instruction scheduling (-mtune) invariably made things
> > worse, across the board.
>
> Even with -mtune=atom on Atom CPUs?
At the time I tested (early February), I don't think there was a
-mtune=atom.
Bill
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