RE: [PATCH] Move Graphite from using PPL over to ISL

["Terry Guo" <terry dot guo at arm dot com>]

> -----Original Message-----
> From: pinskia@gmail.com [mailto:pinskia@gmail.com] On Behalf Of Andrew
> Pinski
> Sent: Wednesday, July 04, 2012 2:58 PM
> To: Terry Guo
> Cc: Richard Guenther; gcc-patches@gcc.gnu.org; tobias@grosser.es;
> sebpop@gmail.com; Michael Matz; Diego Novillo; Joey Ye
> Subject: Re: [PATCH] Move Graphite from using PPL over to ISL
> 
> On Tue, Jul 3, 2012 at 11:51 PM, Terry Guo <terry.guo@arm.com> wrote:
> > Hi Richard,
> >
> > What's the plan for 4.7 branch? Will you back port this patch to 4.7
> and
> > make it use ISL too? I am going to create a upstream GCC SVN branch
> from 4.7
> > for development on ARM embedded processors. If there will be some big
> > changes for 4.7 in near future in terms of replacing PPL with ISL, I
> will
> > delay the creation of my branch. Thanks.
> 
> GCC has a policy of not backporting new features to release branches.
> This can be considered a new feature.  In fact what might happen is
> disabling of the graphite support on the 4.7 branch instead.
> 
> Is there a reason why you can't do development on the trunk?  And then
> support a 4.7 for your own uses?  At Cavium, we try to do development
> on an internal tree and then post them upstream.  Though in the future
> we would like to do things upstream first and then backport features
> to a release branch that we handle internally.
> 

Hi Tobi and Andrew,

Thanks for your timely answers. I just saw Sebastian's comments:

Yes, having GCC only depend on ISL and CLooG-ISL (and not depend
anymore on PPL) is our plan for 4.7.

from http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01161.html.

As for development model, we do work as Andrew said, upstream first and then backport features. The 4.7 branch I mentioned is mainly because we want to make a tool chain release based on 4.7 with some fixes backported from trunk.

BR,
Terry