[Bug target/116072] New: [15 Regression] 4.5% slowdown of 447.dealII on aarch64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116072

            Bug ID: 116072
           Summary: [15 Regression] 4.5% slowdown of 447.dealII 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=588.140.0

there was a 4.5% exec time slowdown of the 447.dealII SPEC 2006 benchmark
between commits

r15-1803-g038d64f62271dd
r15-1889-gf90ca62566c1d2

when run with -Ofast -march=native -flto on an aarch64 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)