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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94373] 548.exchange2_r run time is 16-35% worse than GCC 9 at -O2 and generic march/mtune
Date: Thu, 04 Feb 2021 17:15:32 +0000	[thread overview]
Message-ID: <bug-94373-4-h3IAUBmXep@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94373-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94373

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=98782
            Summary|548.exchange2_r run time is |548.exchange2_r run time is
                   |7-12% worse than GCC 9 at   |16-35% worse than GCC 9 at
                   |-O2 and generic march/mtune |-O2 and generic march/mtune
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-02-04

--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
The regression is confirmed, it is now 35% on Cascadelake, 20% on Zen3
and 16% on Zen2 against GCC 9 (19%, 12% and 8% respectively against
GCC 10)

LNT sees it too:
  - on znver2 (though with LTO):
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=278.407.0&plot.1=298.407.0&
  - on znver1:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=303.407.0&plot.1=31.407.0&
  - on a Kabylake:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=206.407.0&plot.1=30.407.0&

I wonder whether the RA issue PR 98782 might be also related, although
it mostly focuses on -O3.

  parent reply	other threads:[~2021-02-04 17:15 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27 21:49 [Bug tree-optimization/94373] New: 548.exchange2_r run time is 7-12% " jamborm at gcc dot gnu.org
2020-03-27 22:06 ` [Bug target/94373] " pinskia at gcc dot gnu.org
2020-03-30  5:09 ` crazylht at gmail dot com
2020-03-30  6:26 ` crazylht at gmail dot com
2020-03-30  7:59 ` rguenth at gcc dot gnu.org
2021-02-04 17:15 ` jamborm at gcc dot gnu.org [this message]
2023-01-18 16:57 ` [Bug target/94373] 548.exchange2_r run time is 16-35% " jamborm at gcc dot gnu.org

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