[mythtv] --arch=athlon-xp problem (was Re: multirec branch - missing MM_SSE... )

[Janne Grunau]

On Thursday 13 December 2007 22:13:19 Daniel Kristjansson wrote:
> On Thu, 2007-12-13 at 22:08 +0100, Petr Stehlik wrote:
> > OK, so --arch=athlon-xp is either broken or gone, nevermind. The
> > question is whether using "pentiumpro" (as autodetected by the
> > configure script) is the right choice for K8 Athlons...
>
> pentium4 would probably give the fastest code when running 32-bit
> code on a K8. But this would need to be tested.

I doubt that but I don't have hard numbers to back it up. Pentium4 has 
different design optimized for high clock rates.

> The athlon-xp gcc 
> target has always performed worse than pentiumpro on the old 32-bit
> Athlons, but the K8 core may behave differently.

march=k8 or opteron should be fastest, probably followed by pentium3.

Time to clean up the automatic processor flag setting patch.

Janne