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From: "spop at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107409] Perf loss ~5% on 519.lbm_r SPEC
 cpu2017 benchmark with r10-5090-ga9a4edf0e71bba
Date: Thu, 02 Feb 2023 21:35:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107409

Sebastian Pop <spop at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |spop at gcc dot gnu.org

--- Comment #18 from Sebastian Pop <spop at gcc dot gnu.org> ---
A new 5% regression happened in gcc-trunk more recently and may be due to
another patch.

Rama was bisecting a 15% perf regression on lbm when updating gcc-7 to gcc-=
10.
The regression can be seen on the LNT graph link from comment#3=20

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D633.477.0&plot.1=
=3D683.477.0&plot.2=3D664.477.0&plot.3=3D648.477.0&plot.4=3D618.477.0&plot.=
5=3D605.477.0&plot.6=3D759.477.0&plot.7=3D584.477.0

gcc-6 has execution time of 213 seconds
gcc-7 is at 215 seconds
gcc-8 is at 266
gcc-9 at 259
gcc-10 at 260

Honza's patch seems to be unrelated as it was committed to trunk before gcc=
-10
release on May 7, 2020:

commit a9a4edf0e71bbac9f1b5dcecdcf9250111d16889
Author: Jan Hubicka <hubicka@ucw.cz>
Date:   Sat Nov 30 22:25:24 2019 +0100

    Update max_bb_count in execute_fixup_cfg


We need to git-bisect between gcc-7 and gcc-8.=