Jakub's Recommendations for ia32 Support

Bill Nottingham notting at redhat.com
Wed Feb 4 17:55:30 UTC 2009


Ignacio Vazquez-Abrams (ivazqueznet at gmail.com) said: 
> On Wed, 2009-02-04 at 09:26 -0500, Bill Nottingham wrote:
> > Also, -march=i686 was a win over -march=i586, in general, in testing
> > across Atom, Core2Duo, and a Athlon64, although not a particularly
> > significant one.
> 
> How do they compare versus -march=i386?

Didn't test, on the assumption that:

- keeping around support for i386/i486 is pointless
- if emitting i586/i686 instructions was slower... gcc wouldn't do it

Bill




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