From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C22D1C433F5 for ; Wed, 29 Sep 2021 17:22:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A954261465 for ; Wed, 29 Sep 2021 17:22:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245346AbhI2RYW (ORCPT ); Wed, 29 Sep 2021 13:24:22 -0400 Received: from mail-wm1-f45.google.com ([209.85.128.45]:51057 "EHLO mail-wm1-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245157AbhI2RYV (ORCPT ); Wed, 29 Sep 2021 13:24:21 -0400 Received: by mail-wm1-f45.google.com with SMTP id j27so2462516wms.0; Wed, 29 Sep 2021 10:22:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/wYiStrhTYDyD6KyMsoACZjcHuOdOYLgD+s4ib2mjlk=; b=7u3FDuO9W+kJdEglo2mSgk+XHe6n89v1c3X+3Drr8QA336yJYk+gAUP5RoQOd6cgQ3 jiYPfb60q4xS+AuDmJvbyjNi0sRzdNWRZC/770iqo5X+Zpkrq5hBbiqwq7gJF1b5iiZC pIxZf/gWUQlfDHoUIkEOvE/JrahVBdpl14Bc5Lqp7sVhcc3iMNidAhm9U06v1EU1a1wN ZvWV18Onz41uzUGNgbg3IbV0yBKlnrdju5fx5tGMcY21m6OXuXE0F4FtSdi9FNR3qtMz 89IjZythynPqWNlhyj/smdSH8TV8E7rIbzpaxKiUVmGtF7r8lokFWc/s2ik5bkvruWDW 0e9g== X-Gm-Message-State: AOAM533MDe9x77+FnKtHQun4TAHmx0NaZBSbUz+d7R/oZfaUOHvMlmR/ vu0ucaMuIBOgdKHhN9jvxWY= X-Google-Smtp-Source: ABdhPJwj+v6Ia/1ewRH90e4P1/TPFUvE8EwF6nwIW4OtRVbDIJFo8m6XaalECnXB7TPk8E2KUUOv5Q== X-Received: by 2002:a7b:cde8:: with SMTP id p8mr11667995wmj.178.1632936159413; Wed, 29 Sep 2021 10:22:39 -0700 (PDT) Received: from msft-t490s.. (mob-31-159-120-132.net.vodafone.it. [31.159.120.132]) by smtp.gmail.com with ESMTPSA id n26sm2267502wmi.43.2021.09.29.10.22.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Sep 2021 10:22:38 -0700 (PDT) From: Matteo Croce To: linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , Atish Patra , Emil Renner Berthing , Akira Tsukamoto , Drew Fustini , Bin Meng , David Laight , Guo Ren , Christoph Hellwig Subject: [PATCH v5 0/3] riscv: optimized mem* functions Date: Wed, 29 Sep 2021 19:22:31 +0200 Message-Id: <20210929172234.31620-1-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org From: Matteo Croce 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. A further improvement could be to use multiple read and writes as the assembly version was trying to do. Tested on a BeagleV Starlight with a SiFive U74 core, where the improvement is noticeable. v4 -> v5: - call __memcpy() instead of memcpy() in memmove() v3 -> v4: - incorporate changes from proposed generic version: https://lore.kernel.org/lkml/20210702123153.14093-1-mcroce@linux.microsoft.com/ 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 | 154 ++++++++++++++++++++++++++++++++ 8 files changed, 164 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