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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/23249] Epyc and other current AMD CPUs do not select the
 "haswell" platform subdirectory
Date: Mon, 04 Jan 2021 08:02:06 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D23249

--- Comment #19 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Joey Riches from comment #18)
> Will glibc still load from from `/usr/lib64/haswell` or will that
> functionality be stripped out?=20

No formal decision has been made about this.

> Unfortunately x86_64-v3 includes XSAVE instructions which excludes haswell
> so moving to x86_64-v3 will be a performance regression for our haswell
> users.

XSAVE is *required* for AVX register support. If a Haswell-based system does
not support this feature, the kernel has been booted with the =E2=80=9Cnoxs=
ave=E2=80=9D option,
or a hypervisor has been misconfigured.

--=20
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