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Re: Changing the default 32-bit x86 arch for Fedora 12 (#2)



Gerd Hoffmann (kraxel 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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