From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-184526-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 24686 invoked by alias); 2 May 2006 05:01:45 -0000
Received: (qmail 24657 invoked by uid 48); 2 May 2006 05:01:42 -0000
Date: Tue, 02 May 2006 05:01:00 -0000
Message-ID: <20060502050142.24656.qmail@sourceware.org>
X-Bugzilla-Reason: CC
References: <bug-17088-6642@http.gcc.gnu.org/bugzilla/>
Subject: [Bug rtl-optimization/17088] poor fortran optimisation at -O2/3
In-Reply-To: <bug-17088-6642@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "jvdelisle at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2006-05/txt/msg00082.txt.bz2
List-Id: <gcc-bugs.sourceware.org>



------- Comment #12 from jvdelisle at gcc dot gnu dot org  2006-05-02 05:01 -------
With:
$ gfc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../main/configure --prefix=/home/jerry/gcc/usr
--enable-languages=c,fortran --disable-libmudflap
Thread model: posix
gcc version 4.2.0 20060424 (experimental)

$ gfc -O2 -march=pentium4 test-optimize.f90      <gfortran
$ ./a.out
  4.440892098500626E-016
  0.748046000000000       0.544034000000000
$ ifc -O2 test-optimize.f90                      <intel
$ ./a.out
  0.000000000000000E+000
  0.460028000000000       0.436027000000000

Still a lot of room for improvement here.  The bottom left number is time using
matmul and the right is time hardcoded.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17088