[Bug target/119925] New: [15/16 Regression] 4% 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=119925

            Bug ID: 119925
           Summary: [15/16 Regression] 4% slowdown of 538.imagick_r on
                    Aarch64
           Product: gcc
           Version: 16.0
            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=583.507.0

there was a 4% exec time slowdown of the 538.imagick_r SPEC 2017 benchmark
between commits

r15-9236-gb39d5fad621c25
r15-9406-g64319b2ccae2fd

when run with -Ofast -march=native PGO on an Ampere Altra Neoverse N1 machine.

This looks like a regression against GCC 14. See the comparison
here:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.8=1081.507.0&plot.9=583.507.0&;


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)