From: Matteo Croce <mcroce@linux.microsoft.com>
To: linux-riscv@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Atish Patra <atish.patra@wdc.com>,
Emil Renner Berthing <kernel@esmil.dk>,
Akira Tsukamoto <akira.tsukamoto@gmail.com>,
Drew Fustini <drew@beagleboard.org>,
Bin Meng <bmeng.cn@gmail.com>,
David Laight <David.Laight@aculab.com>,
Guo Ren <guoren@kernel.org>
Subject: [PATCH v3 0/3] riscv: optimized mem* functions
Date: Thu, 17 Jun 2021 17:27:51 +0200 [thread overview]
Message-ID: <20210617152754.17960-1-mcroce@linux.microsoft.com> (raw)
From: Matteo Croce <mcroce@microsoft.com>
Replace the assembly mem{cpy,move,set} with C equivalent.
Try to access RAM with the largest bit width possible, but without
doing unaligned accesses.
Tested on a BeagleV Starlight with a SiFive U74 core, where the
improvement is noticeable.
v2 -> v3:
- alias mem* to __mem* and not viceversa
- use __alias instead of a tail call
v1 -> v2:
- reduce the threshold from 64 to 16 bytes
- fix KASAN build
- optimize memset
Matteo Croce (3):
riscv: optimized memcpy
riscv: optimized memmove
riscv: optimized memset
arch/riscv/include/asm/string.h | 18 ++--
arch/riscv/kernel/Makefile | 1 -
arch/riscv/kernel/riscv_ksyms.c | 17 ----
arch/riscv/lib/Makefile | 4 +-
arch/riscv/lib/memcpy.S | 108 ----------------------
arch/riscv/lib/memmove.S | 64 -------------
arch/riscv/lib/memset.S | 113 -----------------------
arch/riscv/lib/string.c | 153 ++++++++++++++++++++++++++++++++
8 files changed, 163 insertions(+), 315 deletions(-)
delete mode 100644 arch/riscv/kernel/riscv_ksyms.c
delete mode 100644 arch/riscv/lib/memcpy.S
delete mode 100644 arch/riscv/lib/memmove.S
delete mode 100644 arch/riscv/lib/memset.S
create mode 100644 arch/riscv/lib/string.c
--
2.31.1
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next reply other threads:[~2021-06-17 15:28 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 15:27 Matteo Croce [this message]
2021-06-17 15:27 ` [PATCH v3 1/3] riscv: optimized memcpy Matteo Croce
2021-06-18 14:06 ` kernel test robot
2021-06-21 14:26 ` Christoph Hellwig
2021-06-22 8:19 ` David Laight
2021-06-22 22:53 ` Matteo Croce
2021-06-22 22:00 ` Matteo Croce
2021-06-22 0:14 ` Nick Kossifidis
2021-06-22 23:35 ` Matteo Croce
2021-06-23 9:48 ` Nick Kossifidis
2021-06-17 15:27 ` [PATCH v3 2/3] riscv: optimized memmove Matteo Croce
2021-06-21 14:28 ` Christoph Hellwig
2021-06-22 0:46 ` Nick Kossifidis
2021-06-30 4:40 ` kernel test robot
2021-06-17 15:27 ` [PATCH v3 3/3] riscv: optimized memset Matteo Croce
2021-06-21 14:32 ` Christoph Hellwig
2021-06-22 1:07 ` Nick Kossifidis
2021-06-22 8:38 ` David Laight
2021-06-23 1:14 ` Matteo Croce
2021-06-23 9:05 ` David Laight
2021-06-23 0:08 ` Matteo Croce
2021-06-22 1:09 ` [PATCH v3 0/3] riscv: optimized mem* functions Nick Kossifidis
2021-06-22 2:39 ` Guo Ren
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=20210617152754.17960-1-mcroce@linux.microsoft.com \
--to=mcroce@linux.microsoft.com \
--cc=David.Laight@aculab.com \
--cc=akira.tsukamoto@gmail.com \
--cc=aou@eecs.berkeley.edu \
--cc=atish.patra@wdc.com \
--cc=bmeng.cn@gmail.com \
--cc=drew@beagleboard.org \
--cc=guoren@kernel.org \
--cc=kernel@esmil.dk \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.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 NNTP newsgroup(s).