[Bug target/114481] New: [14 Regression] 14% exec time slowdown of 433.milc on aarch64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114481

            Bug ID: 114481
           Summary: [14 Regression] 14% exec time slowdown of 433.milc 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=686.70.0

between the commits

g:8b483cd5521de79c
g:81ee1298b47d3f3b

there was an 14% runtime slowdown of 433.milc on aarch64. The CPU is Ampere
Altra Neoverse N1. The compilation options were -O2 -flto PGO.

---

Btw here is a plot that also includes GCC13 and GCC12.

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=686.70.0&plot.4=749.70.0&plot.5=869.70.0


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)