[Bug target/116759] New: [15 Regression] 5% exec time slowdown of 538.imagick_r on aarch64

[pheeck at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116759

            Bug ID: 116759
           Summary: [15 Regression] 5% exec time slowdown of 538.imagick_r
                    on aarch64
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: 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=583.507.0

there was a 5% execution time regression of the 2017 SPEC CPU 538.imagick_r
benchmark when compiled with -Ofast -march=native PGO on aarch64. This happened
between commits

r15-3244-g3178786c88761e
r15-3390-g539fcaae67c888

The machine on which this was measured is Ampere Altra - Neoverse N1.


Referenced Bugs:

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