Fedora development switch to GCC 4.1.0-RH prerelease
Arjan van de Ven
arjan at fenrus.demon.nl
Thu Dec 8 18:47:21 UTC 2005
On Thu, 2005-12-08 at 10:36 -0800, Jesse Barnes wrote:
> On Thursday, December 8, 2005 10:15 am, Arjan van de Ven wrote:
> > > Arjan mentioned the other day that the Fedora linker is capable of
> > > loading CPU specific libraries, depending on which ISA extensions
> > > are available. Since gcc 4.1 has a much improved autovectorizer,
> > > maybe now is the time to start making use of it? It seems like
> > > codec libraries are good candidates for autovectorization, maybe
> > > their spec files could build SSE2, SSE3, and 3dnow variants along
> > > with the regular, non-SIMD versions of the libraries?
> >
> > on x86-64 that's already there. on x86.. why ?
>
> There are still lots of x86 machines out there, including the upcoming,
> dual-core Yonah chip, so providing SIMD versions of the libraries for
> x86 is worthwhile, IMO.
>
> Which libraries have vectorized variants on x86-64? I only saw one for
> my x86 box...
on x86-64 all do.. SSE2 etc are "core" features there and don't need
special dirs, it's part of the normal ABI
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