[Bug tree-optimization/113539] New: [14 Regression] perlbench miscompiled on aarch64 since r14-8223-g1c1853a70f

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113539

            Bug ID: 113539
           Summary: [14 Regression] perlbench miscompiled on aarch64 since
                    r14-8223-g1c1853a70f
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

I'm seeing miscompares of perlbench (both from SPEC CPU 2006 and SPEC CPU 2017)
on aarch64 with recent trunk changes, a bisect pointed to
r14-8223-g1c1853a70f9422169190e65e568dcccbce02d95c :

commit 1c1853a70f9422169190e65e568dcccbce02d95c
Author: Richard Biener <rguent...@suse.de>
Date:   Thu Jan 18 10:22:34 2024

    Fix memory leak in vect_analyze_loop_form

The miscompares are with the checkspam.pl workload, I see:

*** Miscompare of checkspam.2500.5.25.11.150.1.1.1.1.out

I've seen this with:

-flto=auto -fomit-frame-pointer -O3 -fno-strict-aliasing

and various -mcpu options (at least -mcpu=cortex-a72 and -mcpu=neoverse-v1).