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[Bug fortran/34128] slow gfortran 4.x (library?) compared to g77 3.4
- From: "jvdelisle at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Dec 2007 19:00:00 -0000
- Subject: [Bug fortran/34128] slow gfortran 4.x (library?) compared to g77 3.4
- References: <bug-34128-15355@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from jvdelisle at gcc dot gnu dot org 2007-12-08 18:59 -------
On x86-64 (gfc = gfortran)
$ gfc -m32 demo1.f
$ time ./a.out
result = -0.69068092664140723
real 0m0.552s
user 0m0.551s
sys 0m0.001s
$ gfc -m64 demo1.f
$ time ./a.out
result = -0.69068092107772827
real 0m8.533s
user 0m8.532s
sys 0m0.002s
$ g77 -m32 demo1.f
$ time ./a.out
result = -0.990368962
real 0m0.546s
user 0m0.545s
sys 0m0.002s
$ g77 -m64 demo1.f
$ time ./a.out
result = -0.690680921
real 0m0.877s
user 0m0.874s
sys 0m0.003s
$
Something definitely wrong here.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34128