From: Noah Goldstein <goldstein.w.n@gmail.com>
To: Aurelien Jarno <aurelien@aurel32.net>
Cc: libc-alpha@sourceware.org, "H . J . Lu" <hjl.tools@gmail.com>,
Sunil K Pandey <skpgkp2@gmail.com>
Subject: Re: [PATCH v2 3/6] x86-64: Require BMI2 for AVX2 (raw|w)memchr implementations
Date: Sun, 2 Oct 2022 17:08:32 -0400 [thread overview]
Message-ID: <CAFUsyfLa6D_i166gHcxEmcAXS6dqboKe686C1UWHTjAY24krrg@mail.gmail.com> (raw)
In-Reply-To: <20221002123424.3079805-4-aurelien@aurel32.net>
On Sun, Oct 2, 2022 at 8:34 AM Aurelien Jarno <aurelien@aurel32.net> wrote:
>
> The AVX2 memchr, rawmemchr and wmemchr implementations use the 'bzhi'
> and 'sarx' instructions, which belongs to the BMI2 CPU feature.
>
> Fixes: acfd088a1963 ("x86: Optimize memchr-avx2.S")
> Partially resolves: BZ #29611
> ---
> sysdeps/x86_64/multiarch/ifunc-impl-list.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
> index fec8790c11..7c84963d92 100644
> --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
> +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
> @@ -69,10 +69,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
> && CPU_FEATURE_USABLE (BMI2)),
> __memchr_evex_rtm)
> X86_IFUNC_IMPL_ADD_V3 (array, i, memchr,
> - CPU_FEATURE_USABLE (AVX2),
> + (CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI2)),
> __memchr_avx2)
> X86_IFUNC_IMPL_ADD_V3 (array, i, memchr,
> (CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI2)
> && CPU_FEATURE_USABLE (RTM)),
> __memchr_avx2_rtm)
> /* ISA V2 wrapper for SSE2 implementation because the SSE2
> @@ -335,10 +337,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
> && CPU_FEATURE_USABLE (BMI2)),
> __rawmemchr_evex_rtm)
> X86_IFUNC_IMPL_ADD_V3 (array, i, rawmemchr,
> - CPU_FEATURE_USABLE (AVX2),
> + (CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI2)),
> __rawmemchr_avx2)
> X86_IFUNC_IMPL_ADD_V3 (array, i, rawmemchr,
> (CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI2)
> && CPU_FEATURE_USABLE (RTM)),
> __rawmemchr_avx2_rtm)
> /* ISA V2 wrapper for SSE2 implementation because the SSE2
> @@ -927,10 +931,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
> && CPU_FEATURE_USABLE (BMI2)),
> __wmemchr_evex_rtm)
> X86_IFUNC_IMPL_ADD_V3 (array, i, wmemchr,
> - CPU_FEATURE_USABLE (AVX2),
> + (CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI2)),
> __wmemchr_avx2)
> X86_IFUNC_IMPL_ADD_V3 (array, i, wmemchr,
> (CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI2)
> && CPU_FEATURE_USABLE (RTM)),
> __wmemchr_avx2_rtm)
> /* ISA V2 wrapper for SSE2 implementation because the SSE2
> --
> 2.35.1
>
LGTM.
next prev parent reply other threads:[~2022-10-02 21:08 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-02 12:34 [PATCH v2 0/6] x86: Fix AVX2 string functions requiring BMI1, BMI2 or LZCNT (BZ #29611) Aurelien Jarno
2022-10-02 12:34 ` [PATCH v2 1/6] x86: include BMI1 and BMI2 in x86-64-v3 level Aurelien Jarno
2022-10-02 21:07 ` Noah Goldstein
2022-10-02 12:34 ` [PATCH v2 2/6] x86-64: Require BMI2 for AVX2 str*cmp and wcs(n)cmp implementations Aurelien Jarno
2022-10-02 21:08 ` Noah Goldstein
2022-10-03 16:19 ` Sunil Pandey
2022-10-03 17:35 ` Aurelien Jarno
2022-10-03 17:50 ` Noah Goldstein
2022-10-03 18:43 ` Sunil Pandey
2022-10-03 19:21 ` Aurelien Jarno
2022-10-03 19:59 ` Aurelien Jarno
2022-10-03 20:51 ` Sunil Pandey
2022-10-02 12:34 ` [PATCH v2 3/6] x86-64: Require BMI2 for AVX2 (raw|w)memchr implementations Aurelien Jarno
2022-10-02 21:08 ` Noah Goldstein [this message]
2022-10-02 12:34 ` [PATCH v2 4/6] x86-64: Require LZCNT for AVX2 memrchr implementation Aurelien Jarno
2022-10-02 21:08 ` Noah Goldstein
2022-10-02 12:34 ` [PATCH v2 5/6] x86-64: Require BMI1/BMI2 for AVX2 strrchr and wcsrchr implementations Aurelien Jarno
2022-10-02 21:08 ` Noah Goldstein
2022-10-02 12:34 ` [PATCH v2 6/6] x86-64: Require BMI2 for AVX2 memrchr implementation Aurelien Jarno
2022-10-02 21:09 ` Noah Goldstein
2022-10-02 16:21 ` [PATCH v2 0/6] x86: Fix AVX2 string functions requiring BMI1, BMI2 or LZCNT (BZ #29611) Noah Goldstein
2022-10-02 18:09 ` Aurelien Jarno
2022-10-02 21:11 ` Noah Goldstein
2022-10-03 17:36 ` Aurelien Jarno
2022-10-03 17:51 ` Noah Goldstein
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAFUsyfLa6D_i166gHcxEmcAXS6dqboKe686C1UWHTjAY24krrg@mail.gmail.com \
--to=goldstein.w.n@gmail.com \
--cc=aurelien@aurel32.net \
--cc=hjl.tools@gmail.com \
--cc=libc-alpha@sourceware.org \
--cc=skpgkp2@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).