Jakub's Recommendations for ia32 Support

[Bill Nottingham]

Warren Togami (wtogami at redhat.com) said: 
> This is a silly notion.   Atom requires code to be built entirely  
> differently from all modern processors in order to get maximum  
> performance.  Code must be optimized for in-line performance.  Atom  
> target support hasn't even hit gcc-4.4 yet.

Interestingly, using the parts of OpenBench that can actually be
cajoled to build and run correctly (why are benchmark suites such
pain?)... the best option for atom is -march=i686 -mtune=generic.
Tuning for i586 (the previous in-order processor) doesn't actually
help.

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.

Bill