This is the mail archive of the fortran@gcc.gnu.org mailing list for the GNU Fortran project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: Polyhedron performance regression

From: Paul Thomas <paulthomas2 at wanadoo dot fr>
To: Steven Bosscher <stevenb dot gcc at gmail dot com>
Cc: Richard Guenther <richard dot guenther at gmail dot com>, FX Coudert <fxcoudert at gmail dot com>, Jerry DeLisle <jvdelisle at verizon dot net>, Fortran List <fortran at gcc dot gnu dot org>, GCC Development <gcc at gcc dot gnu dot org>, rguenth at gcc dot gnu dot org, Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
Date: Sat, 11 Nov 2006 23:59:56 +0100
Subject: Re: Polyhedron performance regression
References: <4556312C.5020101@verizon.net> <C246BC64-8A20-400F-832D-2BB9E491988B@gmail.com> <84fc9c000611111316y292b66f8sae0e1653c792bdc1@mail.gmail.com> <4556430D.6080201@wanadoo.fr> <571f6b510611111341g3bf61296peec53665037501c@mail.gmail.com>

Steven and Jerry,

If someone can confirm that this patch causes the drop, I can help
trying to find a fix.

amd64/Cygwin_NT

$ /irun/bin/gfortran -O3 -funroll-loops -ffast-math -march=opteron ac.f90

118372     20.2s
118475     20.4s  Bonzini's patch
118704     16.2s

I believe that the improvement is FX's and my patch for MOD.

Notice that this is a single core machine and that there is a PR out on the vectorizer. Could this be the problem, since the suse tests are done on a two core machine, if I understood correctly?

Paul

Follow-Ups:
- Re: Polyhedron performance regression
  - From: Richard Guenther

References:
- Polyhedron performance regression
  - From: Jerry DeLisle
- Re: Polyhedron performance regression
  - From: FX Coudert
- Re: Polyhedron performance regression
  - From: Richard Guenther
- Re: Polyhedron performance regression
  - From: Paul Thomas
- Re: Polyhedron performance regression
  - From: Steven Bosscher

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]