Re: [PATCH 0/3] Configure support for official CLooG versions.

[Jack Howarth <howarth@bromo.med.uc.edu>]

On Thu, Aug 12, 2010 at 12:25:21AM +0200, Andreas Simbuerger wrote:
>  On 08/11/2010 11:55 PM, Joseph S. Myers wrote:
> > On Wed, 11 Aug 2010, Andreas Simbürger wrote:
> >
> >> this patch series adds configure support for upstream CLooG versions.
> >> The official CLooG is able to use three different backends during
> >> code generation. An ISL backend, a PPL backend and a PolyLib backend.
> > Does ISL involve another library that would be linked against instead of 
> > PPL, that needs installing separately from CLooG?  If so, this patch 
> > series appears incomplete, as it doesn't include any addition of 
> > information about ISL to install.texi, or --with-isl etc. options 
> > analogous to the --with-ppl options, or configure code that adds -lisl or 
> > similar (as opposed to -lcloog-isl).  All these things are needed for 
> > making GCC link with a new host-side library.  In addition it will be 
> > necessary to check the portability of ISL to different hosts, similarly to 
> > how people tested PPL on various hosts before the original Graphite merge, 
> > including cases such as building it with cross compilers.
> >
> The Integer Set Library (ISL) is used within CLooG's backend instead
> of the PPL (Another backend using the PolyLib is available too).
> The official CLooG version provides it's own ISL bundle which
> get's installed alongside CLooG itself. The ISL is exclusively used by
> CLooG for now.

Andreas,
    Are there any benchmarks comparing the performance of graphite with
cloog-isl, cloog-polylib and cloog-ppl? In particular, how do the three
compare in effectiveness of properly finding loops and are there large
differences in the time they require to process the data? I had assumed
that cloog-ppl built against ppl-0.11 would be the preferred option
for graphite in gcc 4.6.
                    Jack
> 
> This patch series only prepare GCC for the transition from the CLooG-PPL
> fork,
> maintained by Graphite to the CLooG versions maintained by upstream.
> 
> Regards,
> Andreas
>