Gerd Hoffmann (kraxel(a)redhat.com) said:
On 06/17/09 19:52, Bill Nottingham wrote:
> P4 2.4Ghz Athlon 3400+ Core2Duo E6850 Atom N270
> march=i686/ -1.1% +2.0% +0.9% +0.6%
> mtune=generic
> march=i586/ +0.3% -0.3% -0.2% +1.3%
> mtune=atom
> march=i686/ -1.5% +1.2% +0.5% +1.7%
> mtune=atom
2% difference max. You'll hardly notice that. Is that really worth the
effort?
As *already said*, if you're already doing a mass rebuild, it's near
zero effort. (Also, if you think 5-10% is the threshold for any compiler
performance improvements, the GCC team could use your help.)
Bill