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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111498] New: 951% profile quality regression
 between g:93996cfb308ffc63 (2023-09-18 03:40) and g:95d2ce05fb32e663
 (2023-09-19 03:22)
Date: Wed, 20 Sep 2023 14:42:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111498

            Bug ID: 111498
           Summary: 951% profile quality regression between
                    g:93996cfb308ffc63 (2023-09-18 03:40) and
                    g:95d2ce05fb32e663 (2023-09-19 03:22)
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

This is seen here on tramp3d -fprofile-use -fprofile-report
https://lnt.opensuse.org/db_default/v4/CPP/graph?plot.0=3D463.976.7

Looking at patches in range it may be:

commit d45ddc2c04e471d0dcee016b6edacc00b8341b16
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Sep 14 13:06:51 2023 +0200

    tree-optimization/111294 - backwards threader PHI costing=