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From: "pheeck at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114656] New: ~5% slowdown of 538.imagick_r on aarch64
Date: Tue, 09 Apr 2024 13:22:00 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization, needs-bisection
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pheeck at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114656

            Bug ID: 114656
           Summary: ~5% slowdown of 538.imagick_r on aarch64
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, needs-bisection
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pheeck at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---
              Host: aarch64-gnu-linux
            Target: aarch64-gnu-linux

As seen here

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D585.507.0

between commits

r14-9649-gbb04a11418f54c
r14-9728-g6fc84f680d098f

there was a 5% exec time slowdown of 538.imagick_r SPEC2017 benchmark on
aarch64 with compilation options -Ofast

5% slowdown can be also seen with -Ofast -march=3Dnative

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D584.507.0

The CPU is Ampere Altra Neoverse N1.

Btw here are the same graphs including also data for GCC13. It is clear that
this isn't a regression against GCC13.

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.7=3D882.507.0&plot.8=
=3D585.507.0&
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.7=3D881.507.0&plot.8=
=3D584.507.0&


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=
)=