------- Comment #5 from burnus at gcc dot gnu dot org 2008-11-29 16:18 -------
(In reply to comment #4)
> Timings on x86_64-unknown-linux-gnu:
> matmul = 12.840802 s
> subroutine without explicit interface: 0.88805580 s
> subroutine with explicit interface: 0.87605572 s
> inline with sum 2.0721283 s
With -O2 I get:
matmul = 10.724670 s
subroutine without explicit interface: 7.7324829 s
subroutine with explicit interface: 7.8684921 s
inline with sum 7.7684860 s
Only with I get with -O3 -ffast-math -march=native on AMD64 the following:
matmul = 10.656666 s
subroutine without explicit interface: 0.91205692 s
subroutine with explicit interface: 0.82805157 s
inline with sum 2.4521542 s
For comparison with ifort ("loop was vectorized" in lines 40, 41, 43):
matmul = 2.660166 s
subroutine without explicit interface: 0.0000000E+00 s
subroutine with explicit interface: 0.0000000E+00 s
inline with sum 0.0000000E+00 s
and openf95 -O3:
matmul = 1.26807904 s (-O2: 28.2537651 s)
subroutine without explicit interface: 1.07606697 s (4.07225418)
subroutine with explicit interface: 1.05206609 s (4.08025742)
inline with sum 0.748046875 s (3.7522316)
--
burnus at gcc dot gnu dot org changed:
What |Removed |Added
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CC| |burnus at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37131
