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From: "goldstein.w.n at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/29611] Optimized AVX2 string functions unconditionally
 use BMI2 instructions
Date: Sun, 25 Sep 2022 14:09:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29611

--- Comment #3 from Noah Goldstein <goldstein.w.n at gmail dot com> ---
(In reply to Noah Goldstein from comment #2)
> This was fixed by:
>=20
> commit 83c5b368226c34a2f0a5287df40fc290b2b34359
> Author: H.J. Lu <hjl.tools@gmail.com>
> Date:   Mon Apr 19 10:45:07 2021 -0700
>=20
>     x86-64: Require BMI2 for strchr-avx2.S
>=20
> Which we can probably backport easily. The issue is that some avx2 changes
> where backported without the surrounding ifunc code.
>

I think this needs to be backported to:
2.28-2.32=20

I applies cleanly on 2.32

but for 2.28 - 2.31 it depends on:

commit 107e6a3c2212ba7a3a4ec7cae8d82d73f7c95d0b (HEAD)
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jun 29 16:36:08 2020 -0700

    x86: Support usable check for all CPU features

>=20
>=20
>=20
> Note: This will also be an issue for memchr-avx2.S

--=20
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