| Re: [eigen] Speed issues, array min,max |
[ Thread Index |
Date Index
| More lists.tuxfamily.org/eigen Archives
]
On 05.10.2015 18:08, Gabriel wrote:
Thanks a lot!
I thought something is flawed, but
I compared the assembler output with comments of the following
(hopefully unflawed problem, random numbers, all the same )
http://pastebin.com/qDvLGBfU
I get close timings, but Eigen3 is still slower what can also be seen
from the assembler output below
Is my example still flawed, the Eigen internal dense assignment loop is
not inlined?
Unfortunately, GCC sometimes fails to properly optimize code inside the
main function. After moving your code into a different function, I get
exactly the same assembly (except for a cmovle/cmovs difference, because
you put the zero in front and not at the end, in the Eigen version).
If you still experience speed-differences, it's because the second loop
can work with already initialized caches.
Christoph
--
Dipl. Inf., Dipl. Math. Christoph Hertzberg
Universität Bremen
FB 3 - Mathematik und Informatik
AG Robotik
Robert-Hooke-Straße 1
28359 Bremen, Germany
Zentrale: +49 421 178 45-6611
Besuchsadresse der Nebengeschäftstelle:
Robert-Hooke-Straße 5
28359 Bremen, Germany
Tel.: +49 421 178 45-4021
Empfang: +49 421 178 45-6600
Fax: +49 421 178 45-4150
E-Mail: chtz@xxxxxxxxxxxxxxxxxxxxxxxx
Weitere Informationen: http://www.informatik.uni-bremen.de/robotik