[Bug c++/21316] New: pointer lookup cache misses more frequent

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* [Bug c++/21316] New: pointer lookup cache misses more frequent
@ 2005-05-01 13:23 kpmassey at gmail dot com
  2005-05-01 13:23 ` [Bug c++/21316] " kpmassey at gmail dot com
                   ` (10 more replies)
  0 siblings, 11 replies; 12+ messages in thread
From: kpmassey at gmail dot com @ 2005-05-01 13:23 UTC (permalink / raw)
  To: gcc-bugs

The sample code runs 30-50% slower on my machine when compiled with 3.4.3 as
opposed to 3.3.4.  It creates some objects and then references them via pointer
lookup, so my best guess is that somehow 3.4.3 binaries have many more cache misses.

I have noticed the severe regression on AMD Athlon 3200 running linux 2.6, with
compile options -O3 -march=k8.  Other options (e.g. -O2 instead) don't help.

-- 
           Summary: pointer lookup cache misses more frequent
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kpmassey at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316

^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/21316] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
@ 2005-05-01 13:23 ` kpmassey at gmail dot com
  2005-05-01 13:25 ` kpmassey at gmail dot com
                   ` (9 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: kpmassey at gmail dot com @ 2005-05-01 13:23 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From kpmassey at gmail dot com  2005-05-01 13:23 -------
Created an attachment (id=8781)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8781&action=view)
source file that illustrates problem


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/21316] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
  2005-05-01 13:23 ` [Bug c++/21316] " kpmassey at gmail dot com
@ 2005-05-01 13:25 ` kpmassey at gmail dot com
  2005-05-01 13:26 ` kpmassey at gmail dot com
                   ` (8 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: kpmassey at gmail dot com @ 2005-05-01 13:25 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From kpmassey at gmail dot com  2005-05-01 13:25 -------
Created an attachment (id=8782)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8782&action=view)
.ii file from my compilation


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/21316] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
  2005-05-01 13:23 ` [Bug c++/21316] " kpmassey at gmail dot com
  2005-05-01 13:25 ` kpmassey at gmail dot com
@ 2005-05-01 13:26 ` kpmassey at gmail dot com
  2005-05-01 13:28 ` [Bug target/21316] " pinskia at gcc dot gnu dot org
                   ` (7 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: kpmassey at gmail dot com @ 2005-05-01 13:26 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From kpmassey at gmail dot com  2005-05-01 13:26 -------
Created an attachment (id=8783)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8783&action=view)
.s file from my compilation


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (2 preceding siblings ...)
  2005-05-01 13:26 ` kpmassey at gmail dot com
@ 2005-05-01 13:28 ` pinskia at gcc dot gnu dot org
  2005-05-04  0:16 ` [Bug target/21316] [3.4 Regression] " giovannibajo at libero dot it
                   ` (6 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-05-01 13:28 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |target
           Keywords|                            |missed-optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (3 preceding siblings ...)
  2005-05-01 13:28 ` [Bug target/21316] " pinskia at gcc dot gnu dot org
@ 2005-05-04  0:16 ` giovannibajo at libero dot it
  2005-05-04  1:16 ` pinskia at gcc dot gnu dot org
                   ` (5 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: giovannibajo at libero dot it @ 2005-05-04  0:16 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From giovannibajo at libero dot it  2005-05-04 00:16 -------
Can you try with 4.0.0?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|pointer lookup cache misses |[3.4 Regression] pointer
                   |more frequent               |lookup cache misses more
                   |                            |frequent
   Target Milestone|---                         |3.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (4 preceding siblings ...)
  2005-05-04  0:16 ` [Bug target/21316] [3.4 Regression] " giovannibajo at libero dot it
@ 2005-05-04  1:16 ` pinskia at gcc dot gnu dot org
  2005-05-04  1:20 ` kpmassey at gmail dot com
                   ` (4 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-05-04  1:16 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-04 01:16 -------
I could not reproduce this on a pentium4.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (5 preceding siblings ...)
  2005-05-04  1:16 ` pinskia at gcc dot gnu dot org
@ 2005-05-04  1:20 ` kpmassey at gmail dot com
  2005-05-19 17:34 ` mmitchel at gcc dot gnu dot org
                   ` (3 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: kpmassey at gmail dot com @ 2005-05-04  1:20 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From kpmassey at gmail dot com  2005-05-04 01:20 -------
Subject: Re:  [3.4 Regression] pointer lookup cache misses more frequent

Actually, no.  Gentoo doesn't yet have 4.0.0 in portage, and being a
novice, I am reluctant to build myself.

On 4 May 2005 01:16:33 -0000, pinskia at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
> 
> ------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-04 01:16 -------
> I could not reproduce this on a pentium4.
> 
> --
> 
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316
> 
> ------- You are receiving this mail because: -------
> You reported the bug, or are watching the reporter.
>


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (6 preceding siblings ...)
  2005-05-04  1:20 ` kpmassey at gmail dot com
@ 2005-05-19 17:34 ` mmitchel at gcc dot gnu dot org
  2005-05-22 22:14 ` [Bug target/21316] [3.4/4.0/4.1 " belyshev at depni dot sinp dot msu dot ru
                   ` (2 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2005-05-19 17:34 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.4                       |3.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4/4.0/4.1 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (7 preceding siblings ...)
  2005-05-19 17:34 ` mmitchel at gcc dot gnu dot org
@ 2005-05-22 22:14 ` belyshev at depni dot sinp dot msu dot ru
  2005-07-22 21:36 ` pinskia at gcc dot gnu dot org
  2005-09-27 16:14 ` mmitchel at gcc dot gnu dot org
  10 siblings, 0 replies; 12+ messages in thread
From: belyshev at depni dot sinp dot msu dot ru @ 2005-05-22 22:14 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From belyshev at depni dot sinp dot msu dot ru  2005-05-22 22:14 -------
I can confirm this on amd64:

 gcc        avg. runtime
---------------------------
3.3.6		1.94
3.4.5		2.30
4.0.1		2.64
4.1.0		2.75


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
      Known to fail|                            |3.4.5 4.0.1 4.1.0
      Known to work|                            |3.3.6
   Last reconfirmed|0000-00-00 00:00:00         |2005-05-22 22:14:54
               date|                            |
            Summary|[3.4 Regression] pointer    |[3.4/4.0/4.1 Regression]
                   |lookup cache misses more    |pointer lookup cache misses
                   |frequent                    |more frequent


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4/4.0/4.1 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (8 preceding siblings ...)
  2005-05-22 22:14 ` [Bug target/21316] [3.4/4.0/4.1 " belyshev at depni dot sinp dot msu dot ru
@ 2005-07-22 21:36 ` pinskia at gcc dot gnu dot org
  2005-09-27 16:14 ` mmitchel at gcc dot gnu dot org
  10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-22 21:36 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-07-22 21:13 -------
Moving to 4.0.2 pre Mark.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.5                       |4.0.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug target/21316] [3.4/4.0/4.1 Regression] pointer lookup cache misses more frequent
  2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
                   ` (9 preceding siblings ...)
  2005-07-22 21:36 ` pinskia at gcc dot gnu dot org
@ 2005-09-27 16:14 ` mmitchel at gcc dot gnu dot org
  10 siblings, 0 replies; 12+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2005-09-27 16:14 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.2                       |4.0.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316


^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2005-09-27 16:14 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-05-01 13:23 [Bug c++/21316] New: pointer lookup cache misses more frequent kpmassey at gmail dot com
2005-05-01 13:23 ` [Bug c++/21316] " kpmassey at gmail dot com
2005-05-01 13:25 ` kpmassey at gmail dot com
2005-05-01 13:26 ` kpmassey at gmail dot com
2005-05-01 13:28 ` [Bug target/21316] " pinskia at gcc dot gnu dot org
2005-05-04  0:16 ` [Bug target/21316] [3.4 Regression] " giovannibajo at libero dot it
2005-05-04  1:16 ` pinskia at gcc dot gnu dot org
2005-05-04  1:20 ` kpmassey at gmail dot com
2005-05-19 17:34 ` mmitchel at gcc dot gnu dot org
2005-05-22 22:14 ` [Bug target/21316] [3.4/4.0/4.1 " belyshev at depni dot sinp dot msu dot ru
2005-07-22 21:36 ` pinskia at gcc dot gnu dot org
2005-09-27 16:14 ` mmitchel at gcc dot gnu dot org

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