i486 base architecture

William M. Quarles quarlewm at jmu.edu
Tue Nov 30 06:40:06 UTC 2004


Nicholas Miell wrote:

> On Mon, 2004-11-29 at 10:32 +0100, Arjan van de Ven wrote:
> 
>>branch prediction on p4 actually takes hints from the compiler now ;)
> 
> That turned out to be useless, Intel no longer recommends it (or even
> documents it, IIRC). I'm not sure if gcc still generates the hints when
> targeting P4s.
> 
>>we *already* optimize for i686 even in the i386 rpms
> 
> I meant in terms of using i686 specific instructions (i.e. SSE, SSE2,
> etc.), not i686 instruction scheduling.

SSE is not an i686 instruction set, it's a Pentium-III-and-better 
instruction set.  SSE2 is Pentium-4-and-better.  Other 9686 processors 
are not compatible with those instruction sets.  I hope that you don't 
run into further problems over this when building packages.

----
Peace,
William




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