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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