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 X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7719EC48BE8 for ; Thu, 17 Jun 2021 01:25:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 610F8601FE for ; Thu, 17 Jun 2021 01:25:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231953AbhFQB12 (ORCPT ); Wed, 16 Jun 2021 21:27:28 -0400 Received: from mail-ej1-f48.google.com ([209.85.218.48]:46904 "EHLO mail-ej1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229722AbhFQB1V (ORCPT ); Wed, 16 Jun 2021 21:27:21 -0400 Received: by mail-ej1-f48.google.com with SMTP id he7so6773318ejc.13; Wed, 16 Jun 2021 18:25:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=77paSv1vfUnmhsAZFukXy1zk5MAOuc8TBznUAIk9l+0=; b=rTCtRMPI08xficmOwe8Fqy7gefLcZ6io9/IjubWAW+63GDBZVXncyevlwLAtEZ/tmC 1D4YXJB77EuO5aIu2N3xFDeLMS9LQFas1QBDk4v2/unPZ9yMceBkp2oAq0Nl7OxrsDYG 3qIBMi8Y0uzVZ4rtakL1kC9e2VMDo8Qr+U/5uUzHWERuWtmBaymx0DyAFTMBD7+atFMB S5gqHOFOxwT93ZqMqAN9gnOE7qDM3vuk3phvC9Sf8cmR6PyECSW/WuFltdyF/mS4fMWY jqNOMLaiU68/GQ+65S6JrVrBfoFBduPhDL4QUGEKD5f1ywWHk3oFdr8CP+qRapLKnRmV 3ziQ== X-Gm-Message-State: AOAM533h6khEO3F4z9NGhl/IL4e0H+k/pZoONiOiozuguRRtfwoSm4KB PDGsKHqSLr9n9zXzXzqLjrI= X-Google-Smtp-Source: ABdhPJzIDqhwqbWaknEWaMKhzG/aVdOya/Gu7PhYtIOmdbXoWZZbJ0up5/cW8MXQtJo1WIlrq0OsGQ== X-Received: by 2002:a17:906:dff2:: with SMTP id lc18mr2364636ejc.371.1623893112431; Wed, 16 Jun 2021 18:25:12 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-37-119-128-179.cust.vodafonedsl.it. [37.119.128.179]) by smtp.gmail.com with ESMTPSA id lu21sm2624721ejb.31.2021.06.16.18.25.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jun 2021 18:25:11 -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 Subject: [PATCH v2 0/3] riscv: optimized mem* functions Date: Thu, 17 Jun 2021 03:25:06 +0200 Message-Id: <20210617012509.34265-1-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-kernel@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. Tested on a BeagleV Starlight with a SiFive U74 core, where the improvement is noticeable. 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 | 162 ++++++++++++++++++++++++++++++++ 8 files changed, 172 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