[Bug fortran/34128] slow gfortran 4.x (library?) compared to g77 3.4

[bdavis at gcc dot gnu dot org]

------- Comment #2 from bdavis at gcc dot gnu dot org  2007-11-17 22:35 -------
here is what i got on a P4, running FC8.


[bdavis@localhost gfc]$ /usr/bin/gfortran -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-cpu=generic
--host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20070925 (Red Hat 4.1.2-33)
[bdavis@localhost gfc]$ /usr/bin/gfortran demo1.f
[bdavis@localhost gfc]$ time ./a.out
 result =  -0.690680926641407     

real    0m0.948s
user    0m0.914s
sys     0m0.002s
[bdavis@localhost gfc]$ /usr/bin/gfortran demo2.f
[bdavis@localhost gfc]$ time ./a.out
 result =    1570795059.20410     

real    0m1.853s
user    0m1.808s
sys     0m0.004s
[bdavis@localhost gfc]$ g77 --version
GNU Fortran (GCC) 3.4.6 20060404 (Red Hat 3.4.6-8)
Copyright (C) 2006 Free Software Foundation, Inc.

GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
You may redistribute copies of GNU Fortran
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING
or type the command `info -f g77 Copying'.
[bdavis@localhost gfc]$ g77 demo1.f
[bdavis@localhost gfc]$ time ./a.out
 result =  -0.990368962

real    0m0.938s
user    0m0.912s
sys     0m0.002s
[bdavis@localhost gfc]$ g77 demo2.f
[bdavis@localhost gfc]$ time ./a.out
 result =   1.57079506E+09

real    0m2.386s
user    0m2.354s
sys     0m0.004s



           gfortran      g77
demo1     0m0.948s    0m0.938s
demo2     0m1.853s    0m2.386s


the answers were different on demo1.f


with these versions, and on the P4 under linux, i say gfortran is OK.


--bud


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34128