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From: Florian Weimer <fweimer@redhat.com>
To: "H.J. Lu via Libc-alpha" <libc-alpha@sourceware.org>
Subject: Re: [PATCH] x86-64: Require BMI2 for strchr-avx2.S
References: <20210419175136.2495152-1-hjl.tools@gmail.com>
Date: Mon, 19 Apr 2021 19:58:37 +0200
In-Reply-To: <20210419175136.2495152-1-hjl.tools@gmail.com> (H. J. Lu via
 Libc-alpha's message of "Mon, 19 Apr 2021 10:51:36 -0700")
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* H. J. Lu via Libc-alpha:

> Since strchr-avx2.S updated by
>
> commit 1f745ecc2109890886b161d4791e1406fdfc29b8
> Author: noah <goldstein.w.n@gmail.com>
> Date:   Wed Feb 3 00:38:59 2021 -0500
>
>     x86-64: Refactor and improve performance of strchr-avx2.S
>
> uses sarx:
>
> c4 e2 72 f7 c0       	sarx   %ecx,%eax,%eax
>
> for strchr-avx2 family functions, require BMI2 in ifunc-impl-list.c and
> ifunc-avx2.h.

Seems reasonable, thanks.

Florian