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* [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
@ 2023-07-20 21:55 hubicka at gcc dot gnu.org
2023-07-20 21:58 ` [Bug middle-end/110757] [14 Regression] " pinskia at gcc dot gnu.org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: hubicka at gcc dot gnu.org @ 2023-07-20 21:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
Bug ID: 110757
Summary: 7% parest regression on zen3 -Ofast -march=native
-flto between g:4dbb3af1efe55174 (2023-07-14 00:54)
and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
Product: gcc
Version: 13.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hubicka at gcc dot gnu.org
Target Milestone: ---
seems there are two commits producing this regression. Run in between is
d76d19c9bc5ef113 (2023-07-16 00:16)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=475.457.0
There are earlier two jumps between g:52577a301ef1b86d (2023-05-30 02:20) and
g:d0c064c3eabc75cf (2023-05-31 16:46)
and between g:7ebd4a1d61993c0a (2023-04-28 07:23) and g:977a3be3ccbc7f17
(2023-05-01 13:40)
8% regression is also seen on zen1 machine:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=287.457.0
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
@ 2023-07-20 21:58 ` pinskia at gcc dot gnu.org
2023-07-21 17:17 ` jamborm at gcc dot gnu.org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-07-20 21:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Summary|7% parest regression on |[14 Regression] 7% parest
|zen3 -Ofast -march=native |regression on zen3 -Ofast
|-flto between |-march=native -flto between
|g:4dbb3af1efe55174 |g:4dbb3af1efe55174
|(2023-07-14 00:54) and |(2023-07-14 00:54) and
|g:a5088dc3f5ef73c8 |g:a5088dc3f5ef73c8
|(2023-07-17 03:24) |(2023-07-17 03:24)
Target Milestone|--- |14.0
CC| |pinskia at gcc dot gnu.org
Version|13.1.0 |14.0
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
2023-07-20 21:58 ` [Bug middle-end/110757] [14 Regression] " pinskia at gcc dot gnu.org
@ 2023-07-21 17:17 ` jamborm at gcc dot gnu.org
2023-07-21 19:14 ` jamborm at gcc dot gnu.org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jamborm at gcc dot gnu.org @ 2023-07-21 17:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jamborm at gcc dot gnu.org
--- Comment #1 from Martin Jambor <jamborm at gcc dot gnu.org> ---
The first (2%) slowdown seems to be due to r14-2524-gaa6741ef2e0c31
(Turn TODO_rebuild_frequencies to a pass), I'm now bisecting the
bigger one.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
2023-07-20 21:58 ` [Bug middle-end/110757] [14 Regression] " pinskia at gcc dot gnu.org
2023-07-21 17:17 ` jamborm at gcc dot gnu.org
@ 2023-07-21 19:14 ` jamborm at gcc dot gnu.org
2023-07-22 11:41 ` jamborm at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jamborm at gcc dot gnu.org @ 2023-07-21 19:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
--- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> ---
The second slow-down of 4.5% was caused by r14-2546-g061f74c06735e1:
061f74c06735e1fa35b910ae0bcf01b61a74ec23 is the first bad commit
commit 061f74c06735e1fa35b910ae0bcf01b61a74ec23
Author: Jan Hubicka <jh@suse.cz>
Date: Sun Jul 16 23:56:59 2023 +0200
Fix profile update in scale_profile_for_vect_loop
When vectorizing 4 times, we sometimes do
for
<4x vectorized body>
for
<2x vectorized body>
for
<1x vectorized body>
Here the second two fors handling epilogue never iterates.
Currently vecotrizer thinks that the middle for itrates twice.
This turns out to be scale_profile_for_vect_loop that uses
niter_for_unrolled_loop.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
` (2 preceding siblings ...)
2023-07-21 19:14 ` jamborm at gcc dot gnu.org
@ 2023-07-22 11:41 ` jamborm at gcc dot gnu.org
2023-07-26 7:15 ` hubicka at gcc dot gnu.org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jamborm at gcc dot gnu.org @ 2023-07-22 11:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lili.cui at intel dot com,
| |rguenth at gcc dot gnu.org
Last reconfirmed| |2023-07-22
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> ---
And while I am at it, the 2.5% slowdown in April was caused by Richi's
r14-332-g24905a4bd1375c (Adjust costing of emulated vectorized
gather/scatter) and the 2.8% regression in May by 2.8% is caused by
r14-1371-ge5405f065bace0 (Handle FMA friendly in reassoc pass).
Both are small and so may not warrant their own bug-report but together
they make up almost 6% and we are now 13% slower than GCC 13 on zen 3
and 2 (on the Intel machine in LNT it is just 2.7% and I see no
regression on the Aarch64 one).
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
` (3 preceding siblings ...)
2023-07-22 11:41 ` jamborm at gcc dot gnu.org
@ 2023-07-26 7:15 ` hubicka at gcc dot gnu.org
2024-03-07 23:28 ` law at gcc dot gnu.org
2024-05-07 7:41 ` [Bug middle-end/110757] [14/15 " rguenth at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: hubicka at gcc dot gnu.org @ 2023-07-26 7:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Most of the profile based regression is gone between
g:1c6231c05bdccab3 (2023-07-21 03:06)
and
g:f33fdf9e7c038639 (2023-07-23 00:17)
This should be:
commit a31ef26b056d0c4f0a9f08b6eb81456ea257298e
Author: Jan Hubicka <jh@suse.cz>
Date: Fri Jul 21 19:38:26 2023 +0200
Avoid scaling flat loop profiles of vectorized loops
Which "fixes" the overactive scaling of scale_profile_for_vect_loop
for static profiles.
Still not sure why propagating profile later causes regression - will take a
look.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
` (4 preceding siblings ...)
2023-07-26 7:15 ` hubicka at gcc dot gnu.org
@ 2024-03-07 23:28 ` law at gcc dot gnu.org
2024-05-07 7:41 ` [Bug middle-end/110757] [14/15 " rguenth at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: law at gcc dot gnu.org @ 2024-03-07 23:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
Jeffrey A. Law <law at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
CC| |law at gcc dot gnu.org
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/110757] [14/15 Regression] 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
` (5 preceding siblings ...)
2024-03-07 23:28 ` law at gcc dot gnu.org
@ 2024-05-07 7:41 ` rguenth at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-05-07 7:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|14.0 |14.2
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 14.1 is being released, retargeting bugs to GCC 14.2.
^ permalink raw reply [flat|nested] 8+ messages in thread
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2023-07-20 21:55 [Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24) hubicka at gcc dot gnu.org
2023-07-20 21:58 ` [Bug middle-end/110757] [14 Regression] " pinskia at gcc dot gnu.org
2023-07-21 17:17 ` jamborm at gcc dot gnu.org
2023-07-21 19:14 ` jamborm at gcc dot gnu.org
2023-07-22 11:41 ` jamborm at gcc dot gnu.org
2023-07-26 7:15 ` hubicka at gcc dot gnu.org
2024-03-07 23:28 ` law at gcc dot gnu.org
2024-05-07 7:41 ` [Bug middle-end/110757] [14/15 " rguenth at gcc dot gnu.org
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