From: Xi Ruoyao <xry111@xry111.site>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
libc-alpha@sourceware.org
Subject: Re: [PATCH v5 00/17] Improve generic string routines
Date: Tue, 06 Dec 2022 01:07:16 +0800 [thread overview]
Message-ID: <51f962c19445d29a3187eeedc220558926b56a60.camel@xry111.site> (raw)
In-Reply-To: <20220919195920.956393-1-adhemerval.zanella@linaro.org>
Hi,
Any status update on this series?
On Mon, 2022-09-19 at 16:59 -0300, Adhemerval Zanella via Libc-alpha
wrote:
> It is done by:
>
> 1. parametrizing the internal routines (for instance the find zero
> in a word) so each architecture can reimplement without the need
> to reimplement the whole routine.
>
> 2. vectorizing more string implementations (for instance strcpy
> and strcmp).
>
> 3. Change some implementations to use already possible optimized
> ones (for instance strnlen). It makes new ports to focus on
> only provide optimized implementation of a hardful symbols
> (for instance memchr) and make its improvement to be used in
> a larger set of routines.
>
> For the rest of #5806 I think we can handle them later and if
> performance of generic implementation is closer I think it is better
> to just remove old assembly implementations.
>
> I also checked on x86_64-linux-gnu, i686-linux-gnu, powerpc-linux-gnu,
> and powerpc64-linux-gnu by removing the arch-specific assembly
> implementation and disabling multiarch (it covers both LE and BE
> for 64 and 32 bits). I also checked the string routines on alpha,
> hppa,
> and sh.
>
> Changes since v4:
> * Removed __clz and __ctz in favor of count_leading_zero and
> count_trailing_zeros from longlong.h.
> * Use repeat_bytes more often.
> * Added a comment on strcmp final_cmp on why index_first_zero_ne can
> not be used.
>
> Changes since v3:
> * Rebased against master.
> * Dropped strcpy optimization.
> * Refactor strcmp implementation.
> * Some minor changes in comments.
>
> Changes since v2:
> * Move string-fz{a,b,i} to its own patch.
> * Add a inline implementation for __builtin_c{l,t}z to avoid using
> compiler provided symbols.
> * Add a new header, string-maskoff.h, to handle unaligned accesses
> on some implementation.
> * Fixed strcmp on LE machines.
> * Added a unaligned strcpy variant for architecture that define
> _STRING_ARCH_unaligned.
> * Add SH string-fzb.h (which uses cmp/str instruction to find
> a zero in word).
>
> Changes since v1:
> * Marked ChangeLog entries with [BZ #5806], as appropriate.
> * Reorganized the headers, so that armv6t2 and power6 need override
> as little as possible to use their (integer) zero detection insns.
> * Hopefully fixed all of the coding style issues.
> * Adjusted the memrchr algorithm as discussed.
> * Replaced the #ifdef STRRCHR etc that are used by the multiarch
> * files.
> * Tested on i386, i686, x86_64 (verified this is unused), ppc64,
> ppc64le --with-cpu=power8 (to use power6 in multiarch), armv7,
> aarch64, alpha (qemu) and hppa (qemu).
>
> Adhemerval Zanella (10):
> Add string-maskoff.h generic header
> Add string vectorized find and detection functions
> string: Improve generic strlen
> string: Improve generic strnlen
> string: Improve generic strchr
> string: Improve generic strchrnul
> string: Improve generic strcmp
> string: Improve generic memchr
> string: Improve generic memrchr
> sh: Add string-fzb.h
>
> Richard Henderson (7):
> Parameterize op_t from memcopy.h
> Parameterize OP_T_THRES from memcopy.h
> hppa: Add memcopy.h
> hppa: Add string-fzb.h and string-fzi.h
> alpha: Add string-fzb.h and string-fzi.h
> arm: Add string-fza.h
> powerpc: Add string-fza.h
>
> string/memchr.c | 168 ++++------------
> string/memcmp.c | 4 -
> string/memrchr.c | 189 +++--------------
> -
> string/strchr.c | 172 +++-------------
> string/strchrnul.c | 156 +++------------
> string/strcmp.c | 119 +++++++++--
> string/strlen.c | 90 ++-------
> string/strnlen.c | 137 +------------
> sysdeps/alpha/string-fzb.h | 51 +++++
> sysdeps/alpha/string-fzi.h | 113 +++++++++++
> sysdeps/arm/armv6t2/string-fza.h | 70 +++++++
> sysdeps/generic/memcopy.h | 10 +-
> sysdeps/generic/string-extbyte.h | 37 ++++
> sysdeps/generic/string-fza.h | 106 ++++++++++
> sysdeps/generic/string-fzb.h | 49 +++++
> sysdeps/generic/string-fzi.h | 120 +++++++++++
> sysdeps/generic/string-maskoff.h | 73 +++++++
> sysdeps/generic/string-opthr.h | 25 +++
> sysdeps/generic/string-optype.h | 31 +++
> sysdeps/hppa/memcopy.h | 42 ++++
> sysdeps/hppa/string-fzb.h | 69 +++++++
> sysdeps/hppa/string-fzi.h | 135 +++++++++++++
> sysdeps/i386/i686/multiarch/strnlen-c.c | 14 +-
> sysdeps/i386/memcopy.h | 3 -
> sysdeps/i386/string-opthr.h | 25 +++
> sysdeps/m68k/memcopy.h | 3 -
> sysdeps/powerpc/powerpc32/power4/memcopy.h | 5 -
> .../powerpc32/power4/multiarch/memchr-ppc32.c | 14 +-
> .../power4/multiarch/strchrnul-ppc32.c | 4 -
> .../power4/multiarch/strnlen-ppc32.c | 14 +-
> .../powerpc64/multiarch/memchr-ppc64.c | 9 +-
> sysdeps/powerpc/string-fza.h | 70 +++++++
> sysdeps/s390/strchr-c.c | 11 +-
> sysdeps/s390/strchrnul-c.c | 2 -
> sysdeps/s390/strlen-c.c | 10 +-
> sysdeps/s390/strnlen-c.c | 14 +-
> sysdeps/sh/string-fzb.h | 53 +++++
> 37 files changed, 1366 insertions(+), 851 deletions(-)
> create mode 100644 sysdeps/alpha/string-fzb.h
> create mode 100644 sysdeps/alpha/string-fzi.h
> create mode 100644 sysdeps/arm/armv6t2/string-fza.h
> create mode 100644 sysdeps/generic/string-extbyte.h
> create mode 100644 sysdeps/generic/string-fza.h
> create mode 100644 sysdeps/generic/string-fzb.h
> create mode 100644 sysdeps/generic/string-fzi.h
> create mode 100644 sysdeps/generic/string-maskoff.h
> create mode 100644 sysdeps/generic/string-opthr.h
> create mode 100644 sysdeps/generic/string-optype.h
> create mode 100644 sysdeps/hppa/memcopy.h
> create mode 100644 sysdeps/hppa/string-fzb.h
> create mode 100644 sysdeps/hppa/string-fzi.h
> create mode 100644 sysdeps/i386/string-opthr.h
> create mode 100644 sysdeps/powerpc/string-fza.h
> create mode 100644 sysdeps/sh/string-fzb.h
>
--
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University
next prev parent reply other threads:[~2022-12-05 17:07 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-19 19:59 Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 01/17] Parameterize op_t from memcopy.h Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 02/17] Parameterize OP_T_THRES " Adhemerval Zanella
2022-09-20 10:49 ` Carlos O'Donell
2022-09-19 19:59 ` [PATCH v5 03/17] Add string-maskoff.h generic header Adhemerval Zanella
2022-09-20 11:43 ` Carlos O'Donell
2022-09-22 17:31 ` Adhemerval Zanella Netto
2023-01-05 22:49 ` Noah Goldstein
2023-01-05 23:26 ` Alejandro Colomar
2023-01-09 18:19 ` Adhemerval Zanella Netto
2023-01-09 18:02 ` Adhemerval Zanella Netto
2022-09-19 19:59 ` [PATCH v5 04/17] Add string vectorized find and detection functions Adhemerval Zanella
2023-01-05 22:53 ` Noah Goldstein
2023-01-09 18:51 ` Adhemerval Zanella Netto
2023-01-05 23:04 ` Noah Goldstein
2023-01-09 19:34 ` Adhemerval Zanella Netto
2022-09-19 19:59 ` [PATCH v5 05/17] string: Improve generic strlen Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 06/17] string: Improve generic strnlen Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 07/17] string: Improve generic strchr Adhemerval Zanella
2023-01-05 23:09 ` Noah Goldstein
2023-01-05 23:19 ` Noah Goldstein
2023-01-09 19:39 ` Adhemerval Zanella Netto
2022-09-19 19:59 ` [PATCH v5 08/17] string: Improve generic strchrnul Adhemerval Zanella
2023-01-05 23:17 ` Noah Goldstein
2023-01-09 20:35 ` Adhemerval Zanella Netto
2023-01-09 20:49 ` Richard Henderson
2023-01-09 20:59 ` Noah Goldstein
2023-01-09 21:01 ` Noah Goldstein
2023-01-09 23:33 ` Richard Henderson
2023-01-10 14:18 ` Adhemerval Zanella Netto
2023-01-10 16:24 ` Richard Henderson
2023-01-10 17:16 ` Noah Goldstein
2023-01-10 18:19 ` Adhemerval Zanella Netto
2023-01-10 17:17 ` Noah Goldstein
2023-01-10 18:16 ` Adhemerval Zanella Netto
2022-09-19 19:59 ` [PATCH v5 09/17] string: Improve generic strcmp Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 10/17] string: Improve generic memchr Adhemerval Zanella
2023-01-05 23:47 ` Noah Goldstein
2023-01-09 20:50 ` Adhemerval Zanella Netto
2023-01-05 23:49 ` Noah Goldstein
2023-01-09 20:51 ` Adhemerval Zanella Netto
2023-01-09 21:26 ` Noah Goldstein
2023-01-10 14:33 ` Adhemerval Zanella Netto
2022-09-19 19:59 ` [PATCH v5 11/17] string: Improve generic memrchr Adhemerval Zanella
2023-01-05 23:51 ` Noah Goldstein
2022-09-19 19:59 ` [PATCH v5 12/17] hppa: Add memcopy.h Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 13/17] hppa: Add string-fzb.h and string-fzi.h Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 14/17] alpha: " Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 15/17] arm: Add string-fza.h Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 16/17] powerpc: " Adhemerval Zanella
2022-09-19 19:59 ` [PATCH v5 17/17] sh: Add string-fzb.h Adhemerval Zanella
2022-12-05 17:07 ` Xi Ruoyao [this message]
2023-01-05 21:56 ` [PATCH v5 00/17] Improve generic string routines Adhemerval Zanella Netto
2023-01-05 23:52 ` Noah Goldstein
2023-01-06 13:43 ` Adhemerval Zanella Netto
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=51f962c19445d29a3187eeedc220558926b56a60.camel@xry111.site \
--to=xry111@xry111.site \
--cc=adhemerval.zanella@linaro.org \
--cc=libc-alpha@sourceware.org \
/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).