-mtune=nocona vs. -mtune=k8

[Luciano Miguel Ferreira Rocha]

On Wed, Apr 13, 2005 at 10:11:54AM -0400, Dan Williams wrote:
> On Wed, 2005-04-13 at 09:02 -0500, Justin Conover wrote:
> > I'm just curious if that makes a difference in speed on amd64,  does
> > mtune=nocona affect the way k8 processors perform.  Or do they for the
> > most part have little effect.
> 
> The speed hit (if any) from -mtune=nocona on AMD64 is miniscule, which
> cannot be said for using -mtune=k8/opteron/athon64 with Intel EM64T
> processors, if I understand some of Jakub's past comments correctly.
> Basically, k8+EM64T is worse than nocona+Opteron.  Jakub would be more
> authoritative on this issue though.

What about the speed _gains_? (mtune=k8 on AMD64, mtune=nocona on EM64T)
Any data?

-- lfr
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