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* [Bug target/111616] New: On Zen2 7% 519.lbm_r regression between g:1d17d58c284fa8c3 (2023-09-14 02:39) and g:c8e9a75085f9725c (2023-09-18 13:09)
@ 2023-09-27 15:02 fkastl at suse dot cz
  2023-10-04 11:38 ` [Bug target/111616] " fkastl at suse dot cz
  0 siblings, 1 reply; 2+ messages in thread
From: fkastl at suse dot cz @ 2023-09-27 15:02 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111616

            Bug ID: 111616
           Summary: On Zen2 7% 519.lbm_r regression between
                    g:1d17d58c284fa8c3 (2023-09-14 02:39) and
                    g:c8e9a75085f9725c (2023-09-18 13:09)
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: needs-bisection
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fkastl at suse dot cz
                CC: mjambor at suse dot cz
  Target Milestone: ---
              Host: x86_64-linux
            Target: x86_64-linux

On x86_64 AMD Zen2 machine with Ofast LTO PGO march=native mtune=native between
commits g:1d17d58c284fa8c3 (2023-09-14 02:39) and g:c8e9a75085f9725c
(2023-09-18 13:09) there is a 519.lbm_r 7% execution time regression.

Here is a plot of recent measurements:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=286.477.0

I confirmed this on another Zen2 machine. This time I measured 9% slowdown.

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug target/111616] On Zen2 7% 519.lbm_r regression between g:1d17d58c284fa8c3 (2023-09-14 02:39) and g:c8e9a75085f9725c (2023-09-18 13:09)
  2023-09-27 15:02 [Bug target/111616] New: On Zen2 7% 519.lbm_r regression between g:1d17d58c284fa8c3 (2023-09-14 02:39) and g:c8e9a75085f9725c (2023-09-18 13:09) fkastl at suse dot cz
@ 2023-10-04 11:38 ` fkastl at suse dot cz
  0 siblings, 0 replies; 2+ messages in thread
From: fkastl at suse dot cz @ 2023-10-04 11:38 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111616

Filip Kastl <fkastl at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #1 from Filip Kastl <fkastl at suse dot cz> ---
I'm not sure which commit fixed the slowdown but it is now gone. 519.lbm_r
performance is back to where it was at g:1d17d58c284fa8c3.

Marking as fixed.

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2023-09-27 15:02 [Bug target/111616] New: On Zen2 7% 519.lbm_r regression between g:1d17d58c284fa8c3 (2023-09-14 02:39) and g:c8e9a75085f9725c (2023-09-18 13:09) fkastl at suse dot cz
2023-10-04 11:38 ` [Bug target/111616] " fkastl at suse dot cz

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