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Date: Fri, 17 Aug 2012 22:34:45 +0100
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Subject: Re: [gentoo-user] common flags for 2 cpu?
From: Jorge Almeida <jjalmeida@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Fri, Aug 17, 2012 at 10:05 PM, Florian Philipp <lists@binarywings.net> wrote:
> Am 17.08.2012 19:57, schrieb Jorge Almeida:
>> I read in http://forums.gentoo.org/viewtopic-t-895104.html :
>> atom
>> Intel Atom CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3 and SSSE3
>> instruction set support.
>>
>> Does this mean that these flags are pulled by -mtune=atom, or do we need to
>> ask for them explicitly? The WiKi shows how to find which flags are pulled by
>> -march=native, but not the other cases.
>>
>> Thanks
>>
>> Jorge Almeida
>>
>
> Oh, sorry, I didn't think of the second generation atoms. I guess your
> newer atom is a bit more different from prescott than the one I talked
> about. Anyway, using -march=prescott is still viable. It just means you
> lose a bit more in terms of usable SSE extensions on your atom.
>
> Your CFLAGS look good to me. They won't pull in anything that your
> prescott cannot handle.
>
Does -march=prescott not ensure that the prescott will work even if
unsupported flags are added? Of, course such flags wouldn't be of use by the
prescott, but the atom might be able to use them. Can you confirm this?

Thanks,

Jorge Almeida