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[Bug rtl-optimization/31021] gfortran 20% slower than ifort on CP2K computational kernel
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Feb 2009 07:50:27 -0000
- Subject: [Bug rtl-optimization/31021] gfortran 20% slower than ifort on CP2K computational kernel
- References: <bug-31021-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #10 from jv244 at cam dot ac dot uk 2009-02-07 07:50 -------
(In reply to comment #9)
> Confirmed with gcc 4.3. Where do we stand today?
same place:
gfortran -O3 -march=native -ffast-math -ffree-form -ftree-vectorize
gcc version 4.4.0 20090207 (experimental) (GCC)
> ./a.out
# of primitives 154502
# computational kernel timings 5
Kernel time 4.4882798
Kernel time 4.4922795
Kernel time 4.4882793
ifort -v
Version 9.1
./a.out
# of primitives 154502
# computational kernel timings 5
Kernel time 3.800237
Kernel time 3.792237
Kernel time 3.796237
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31021