[Bug target/117270] New: [15 Regression] 9% 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=117270

            Bug ID: 117270
           Summary: [15 Regression] 9% exec time slowdown of 538.imagick_r
                    on aarch64
           Product: gcc
           Version: 15.0
            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=585.507.0

there was a 9% exec time slowdown of the 538.imagick_r SPEC 2017 benchmark
between commits

r15-4033-g1f619fe25925a5
r15-4183-g517d344e416c76

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


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)