* [Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
@ 2005-04-11 13:20 ` denis dot nagorny at intel dot com
2005-04-11 13:28 ` pinskia at gcc dot gnu dot org
` (10 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: denis dot nagorny at intel dot com @ 2005-04-11 13:20 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From denis dot nagorny at intel dot com 2005-04-11 13:20 -------
Created an attachment (id=8591)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8591&action=view)
Test for results reproducing
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
2005-04-11 13:20 ` [Bug fortran/20945] " denis dot nagorny at intel dot com
@ 2005-04-11 13:28 ` pinskia at gcc dot gnu dot org
2005-04-11 20:08 ` pinskia at gcc dot gnu dot org
` (9 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-04-11 13:28 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-04-11 13:28 -------
I know that gfortran has some issue with inlining.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
2005-04-11 13:20 ` [Bug fortran/20945] " denis dot nagorny at intel dot com
2005-04-11 13:28 ` pinskia at gcc dot gnu dot org
@ 2005-04-11 20:08 ` pinskia at gcc dot gnu dot org
2005-04-18 15:46 ` hjl at lucon dot org
` (8 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-04-11 20:08 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-04-11 20:08 -------
Note I think this is just the register allocator being stupid.
See PR 18048 for another bug report about this.
Though I note on ppc-darwin, I cannot reproduce the problem you see with your testcase.
--
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |18048
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (2 preceding siblings ...)
2005-04-11 20:08 ` pinskia at gcc dot gnu dot org
@ 2005-04-18 15:46 ` hjl at lucon dot org
2005-06-19 7:34 ` fxcoudert at gcc dot gnu dot org
` (7 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: hjl at lucon dot org @ 2005-04-18 15:46 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl at lucon dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (3 preceding siblings ...)
2005-04-18 15:46 ` hjl at lucon dot org
@ 2005-06-19 7:34 ` fxcoudert at gcc dot gnu dot org
2005-06-22 14:34 ` denis dot nagorny at intel dot com
` (6 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2005-06-19 7:34 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From fxcoudert at gcc dot gnu dot org 2005-06-19 07:34 -------
On Pentium III (Coppermine), 864 MHz, 256 KB cache, with linux. Timing in seconds:
g77: 9.52s
gfortran: 9.49s
g77 -O2: 3.11s
gfortran -O2: 3.39s
g77 -O3 -ffast-math: 3.09s
gfortran -O3 -ffast-math: 3.37s
So, I can't confirm your timings. You should perhaps use longer loops (since
your timings are less than a second, you could see the effect of something
external to the floating-point performance itself).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (4 preceding siblings ...)
2005-06-19 7:34 ` fxcoudert at gcc dot gnu dot org
@ 2005-06-22 14:34 ` denis dot nagorny at intel dot com
2005-06-22 14:37 ` [Bug rtl-optimization/20945] " pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: denis dot nagorny at intel dot com @ 2005-06-22 14:34 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From denis dot nagorny at intel dot com 2005-06-22 14:34 -------
Ok. It seems like this issue is mostly fixed now. I incresead NIT counter up
to 200 and obtained following results:
3.4.2 ~ 3.4s
old 4.0 ~ 6.4s
mainline ~ 4.0s
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug rtl-optimization/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (5 preceding siblings ...)
2005-06-22 14:34 ` denis dot nagorny at intel dot com
@ 2005-06-22 14:37 ` pinskia at gcc dot gnu dot org
2005-06-25 11:36 ` steven at gcc dot gnu dot org
` (4 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-06-22 14:37 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-22 14:37 -------
I think this is the normal register pressure issue in GCC's RA.
See <http://www.gccsummit.org/2005/view_abstract.php?content_key=1> for a discussion which will
happen later today.
--
What |Removed |Added
----------------------------------------------------------------------------
Component|fortran |rtl-optimization
Keywords| |missed-optimization, ra
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug rtl-optimization/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (6 preceding siblings ...)
2005-06-22 14:37 ` [Bug rtl-optimization/20945] " pinskia at gcc dot gnu dot org
@ 2005-06-25 11:36 ` steven at gcc dot gnu dot org
2005-06-25 11:38 ` steven at gcc dot gnu dot org
` (3 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: steven at gcc dot gnu dot org @ 2005-06-25 11:36 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From steven at gcc dot gnu dot org 2005-06-25 11:36 -------
Speculation is not going to help anyone. What does the generated code
look like for 3.4.2, 4.0.0 and CVS HEAD? Bonus points for annotated
assembly output so that it is easier to interpret the results.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug rtl-optimization/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (7 preceding siblings ...)
2005-06-25 11:36 ` steven at gcc dot gnu dot org
@ 2005-06-25 11:38 ` steven at gcc dot gnu dot org
2005-07-09 16:35 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: steven at gcc dot gnu dot org @ 2005-06-25 11:38 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From steven at gcc dot gnu dot org 2005-06-25 11:38 -------
And FWIW, yes there are a number of known issues with optimizing for mgrid
on ia32. Try e.g. -fno-tree-pre, this used to be a major win for mgrid.
What can you expect, when the hot loop has 11 integer register candidates
that GCC all puts in GIMPLE registers, but your silly target only has 6
registers. Long live AMD64!
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug rtl-optimization/20945] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (8 preceding siblings ...)
2005-06-25 11:38 ` steven at gcc dot gnu dot org
@ 2005-07-09 16:35 ` pinskia at gcc dot gnu dot org
2005-07-10 19:55 ` [Bug rtl-optimization/20945] [4.0/4.1 Regresson] " pinskia at gcc dot gnu dot org
2005-09-29 4:08 ` pinskia at gcc dot gnu dot org
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-09 16:35 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
GCC build triplet|i586-suse-linux |
GCC host triplet|i586-suse-linux |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug rtl-optimization/20945] [4.0/4.1 Regresson] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (9 preceding siblings ...)
2005-07-09 16:35 ` pinskia at gcc dot gnu dot org
@ 2005-07-10 19:55 ` pinskia at gcc dot gnu dot org
2005-09-29 4:08 ` pinskia at gcc dot gnu dot org
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-10 19:55 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |18427
Summary|about 2x perfomance |[4.0/4.1 Regresson] about 2x
|regression in comparision |perfomance regression in
|with 3.4.2 |comparision with 3.4.2
Target Milestone|--- |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug rtl-optimization/20945] [4.0/4.1 Regresson] about 2x perfomance regression in comparision with 3.4.2
2005-04-11 13:17 [Bug fortran/20945] New: about 2x perfomance regression in comparision with 3.4.2 denis dot nagorny at intel dot com
` (10 preceding siblings ...)
2005-07-10 19:55 ` [Bug rtl-optimization/20945] [4.0/4.1 Regresson] " pinskia at gcc dot gnu dot org
@ 2005-09-29 4:08 ` pinskia at gcc dot gnu dot org
11 siblings, 0 replies; 13+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-29 4:08 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet|i586-suse-linux |i586-*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945
^ permalink raw reply [flat|nested] 13+ messages in thread