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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102448] [12 Regression] wrong codegen in gcc
 in spec2017 since 24f99147b9264f8f7d9cfb2fa6bd431edfa252d2
Date: Thu, 23 Sep 2021 06:35:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102448

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Tamar Christina from comment #2)
> I have double checked the revision and it does start happening with it.
>=20
> Though I can only reproduce it with -flto.  the codegen without lto seems
> the same.
>=20
> Any ideas how to debug further?

Since you identified the offending assembler see what's the corresponding
source portion - there look at the .optimized gimple dumps and see when the=
 bad
code was introduced.  I'll see if the issue reproduces on x86_64.

What options are you using for aarch64 besides -flto and which -march?=