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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101936] New: 538.imagick_r -Ofast regression
 Kabylake
Date: Mon, 16 Aug 2021 12:48:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101936

            Bug ID: 101936
           Summary: 538.imagick_r -Ofast regression Kabylake
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---

When compiling with -Ofast -march=3Dnative, the benchmark is ~27% slower on
-march=3Dskylake machine:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D32.507.0

I'm bisecting that right now on a Znver1 machine with -march=3Dskylake set.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95=
)=