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Subject: Re: Efficient memcpy()/memmove() for G2/G3 cores...
From: Steven Munroe <munroesj@linux.vnet.ibm.com>
To: benh@kernel.crashing.org
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Date: Wed, 27 Aug 2008 16:04:39 -0500
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Cc: linuxppc-dev@ozlabs.org, David Jander <david.jander@protonic.nl>
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On Tue, 2008-08-26 at 08:28 +1000, Benjamin Herrenschmidt wrote:
> On Mon, 2008-08-25 at 15:06 +0200, David Jander wrote:
> > Hi Matt,
> > 
> > On Monday 25 August 2008 13:00:10 Matt Sealey wrote:
> > > The focus has definitely been on VMX but that's not to say lower power
> > > processors were forgotten :)
> > 
> > lower-power (pun intended) is coming strong these days, as energy-efficiency 
> > is getteing more important every day. And the MPC5121 is a brand-new embedded 
> > processor, that will pop-up in quite a lot devices around you most 
> > probably ;-)
> 
> It would be useful of somebody interested in getting things things
> into glibc did the necessary FSF copyright assignment stuff and worked
> toward integrating them.
> 

Ben makes a very good point!

There is a process for contributing code to GLIBC, which starts with an
FSF copyright assignment.

There is also a framework for adding and maintaining optimizations of
this type:

http://penguinppc.org/dev/glibc/glibc-powerpc-cpu-addon.html

Since this original effort the powerpc changes have been merged into
mainline glibc (GLIBC-2.7) and no longer require a separate
(powerpc-cpu) addon. But the --with-cpu= configure option still works.
This mechanism also works with the glibc ports addon and eglibc.

So it does no good to complain here. If you have core you want to
contribute, Get your FSF CR assignment and join #glibc on freenode IRC.

And we will help you.