Changing the default 32-bit x86 arch for Fedora 12 (#2)
Bill Nottingham
notting at redhat.com
Thu Jun 18 13:38:58 UTC 2009
Gerd Hoffmann (kraxel at 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
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