* [Bug c++/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
@ 2011-06-21 12:38 ` ismail at namtrac dot org
2011-09-23 21:58 ` paolo.carlini at oracle dot com
` (12 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: ismail at namtrac dot org @ 2011-06-21 12:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #1 from İsmail "cartman" Dönmez <ismail at namtrac dot org> 2011-06-21 12:37:49 UTC ---
Test machine has Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz CPU with 8GB of RAM.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
2011-06-21 12:38 ` [Bug c++/49485] " ismail at namtrac dot org
@ 2011-09-23 21:58 ` paolo.carlini at oracle dot com
2011-10-20 1:02 ` paolo.carlini at oracle dot com
` (11 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-09-23 21:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-09-23 21:54:15 UTC ---
Richard, maybe you are interested in triaging this.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
2011-06-21 12:38 ` [Bug c++/49485] " ismail at namtrac dot org
2011-09-23 21:58 ` paolo.carlini at oracle dot com
@ 2011-10-20 1:02 ` paolo.carlini at oracle dot com
2011-10-20 1:08 ` [Bug target/49485] " pinskia at gcc dot gnu.org
` (10 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-10-20 1:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-20 01:02:10 UTC ---
Adding Jakub too, I'm not sure about the best way to handle this one.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (2 preceding siblings ...)
2011-10-20 1:02 ` paolo.carlini at oracle dot com
@ 2011-10-20 1:08 ` pinskia at gcc dot gnu.org
2011-10-20 1:09 ` pinskia at gcc dot gnu.org
` (9 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-10-20 1:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |i?86-*-*
Component|c++ |target
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-10-20 01:08:13 UTC ---
The slow down only happens on x86 and not x86_64.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (3 preceding siblings ...)
2011-10-20 1:08 ` [Bug target/49485] " pinskia at gcc dot gnu.org
@ 2011-10-20 1:09 ` pinskia at gcc dot gnu.org
2011-10-20 1:15 ` pinskia at gcc dot gnu.org
` (8 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-10-20 1:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-10-20 01:09:02 UTC ---
apinski@apinskidesktop:~$ g++ t.cc -O3 -ffast-math
apinski@apinskidesktop:~$ ./a.out
apinski@apinskidesktop:~$ time ./a.out
real 0m0.329s
user 0m0.328s
sys 0m0.000s
apinski@apinskidesktop:~$ ~/local-gcc/bin/g++ t.cc -O3 -ffast-math
apinski@apinskidesktop:~$ time ./a.out
real 0m0.313s
user 0m0.312s
sys 0m0.000s
apinski@apinskidesktop:~$ ~/local-gcc/bin/g++ t.cc -O3 -ffast-math -m32
apinski@apinskidesktop:~$ time ./a.out
real 0m0.528s
user 0m0.384s
sys 0m0.008s
apinski@apinskidesktop:~$ g++ t.cc -O3 -ffast-math -m32
apinski@apinskidesktop:~$ time ./a.out
real 0m0.471s
user 0m0.464s
sys 0m0.008s
--- CUT ---
gcc version 4.7.0 20111005 (experimental) [trunk revision 179579] (GCC)
gcc version 4.4.5 (Debian 4.4.5-8)
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (4 preceding siblings ...)
2011-10-20 1:09 ` pinskia at gcc dot gnu.org
@ 2011-10-20 1:15 ` pinskia at gcc dot gnu.org
2011-10-20 7:38 ` jakub at gcc dot gnu.org
` (7 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-10-20 1:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-10-20 01:13:54 UTC ---
Looks like vectorizer is causing the slow down at least for me on the trunk
that is -mno-sse makes the slowdown go away.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (5 preceding siblings ...)
2011-10-20 1:15 ` pinskia at gcc dot gnu.org
@ 2011-10-20 7:38 ` jakub at gcc dot gnu.org
2011-10-20 7:58 ` jakub at gcc dot gnu.org
` (6 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-10-20 7:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-20 07:36:40 UTC ---
For me the trunk with vectorization is certainly faster than 4.3, it is true
that 4.6 is slower.
4.3 -O3 -ffast-math 0m0.144s
4.3 -O3 -ffast-math -fno-tree-vectorize 0m0.167s
4.6 -O3 -ffast-math 0m0.194s
4.6 -O3 -ffast-math -fno-tree-vectorize 0m0.195s
4.6 -O3 -ffast-math -mavx 0m0.181s
trunk -O3 -ffast-math 0m0.127s
trunk -O3 -ffast-math -fno-tree-vectorize 0m0.176s
trunk -O3 -ffast-math -mavx 0m0.071s
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (6 preceding siblings ...)
2011-10-20 7:38 ` jakub at gcc dot gnu.org
@ 2011-10-20 7:58 ` jakub at gcc dot gnu.org
2011-10-20 8:20 ` paolo.carlini at oracle dot com
` (5 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-10-20 7:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-20 07:57:10 UTC ---
BTW, 4.6 numbers can be improved to the trunk numbers by applying
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179460
(aka a subset of Eric's r179165 change) - C++ references here prevent the
vectorization of one of the loops.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (7 preceding siblings ...)
2011-10-20 7:58 ` jakub at gcc dot gnu.org
@ 2011-10-20 8:20 ` paolo.carlini at oracle dot com
2011-10-20 8:44 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-10-20 8:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-20 08:19:28 UTC ---
Ah great. Then I wonder if at this point we couldn't even resolve this..
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (8 preceding siblings ...)
2011-10-20 8:20 ` paolo.carlini at oracle dot com
@ 2011-10-20 8:44 ` jakub at gcc dot gnu.org
2011-10-20 9:28 ` [Bug target/49485] [4.6 Regression] " paolo.carlini at oracle dot com
` (3 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-10-20 8:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-20 08:42:55 UTC ---
Certainly not right now, this isn't a kind of change that should be added in
between 4.6.2-RC and 4.6.2. Maybe later.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] [4.6 Regression] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (9 preceding siblings ...)
2011-10-20 8:44 ` jakub at gcc dot gnu.org
@ 2011-10-20 9:28 ` paolo.carlini at oracle dot com
2011-10-27 9:42 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-10-20 9:28 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011-10-20
Summary|Performance problem with |[4.6 Regression]
|C++ code |Performance problem with
| |C++ code
Ever Confirmed|0 |1
--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-20 09:27:32 UTC ---
Of course, assuming you actually mean to backport something. Thanks again.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] [4.6 Regression] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (10 preceding siblings ...)
2011-10-20 9:28 ` [Bug target/49485] [4.6 Regression] " paolo.carlini at oracle dot com
@ 2011-10-27 9:42 ` rguenth at gcc dot gnu.org
2012-03-01 14:56 ` jakub at gcc dot gnu.org
2013-04-12 16:18 ` jakub at gcc dot gnu.org
13 siblings, 0 replies; 15+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-10-27 9:42 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.6.3
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] [4.6 Regression] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (11 preceding siblings ...)
2011-10-27 9:42 ` rguenth at gcc dot gnu.org
@ 2012-03-01 14:56 ` jakub at gcc dot gnu.org
2013-04-12 16:18 ` jakub at gcc dot gnu.org
13 siblings, 0 replies; 15+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-03-01 14:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.6.3 |4.6.4
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-01 14:38:43 UTC ---
GCC 4.6.3 is being released.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug target/49485] [4.6 Regression] Performance problem with C++ code
2011-06-21 12:37 [Bug c++/49485] New: Performance problem with C++ code ismail at namtrac dot org
` (12 preceding siblings ...)
2012-03-01 14:56 ` jakub at gcc dot gnu.org
@ 2013-04-12 16:18 ` jakub at gcc dot gnu.org
13 siblings, 0 replies; 15+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-04-12 16:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|4.6.4 |4.7.0
--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-12 16:17:48 UTC ---
The 4.6 branch has been closed, fixed in GCC 4.7.0.
^ permalink raw reply [flat|nested] 15+ messages in thread