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=ham 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 8784FC433EF for ; Sun, 19 Sep 2021 19:21:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C21860F9C for ; Sun, 19 Sep 2021 19:21:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229961AbhISTXD (ORCPT ); Sun, 19 Sep 2021 15:23:03 -0400 Received: from mail-ed1-f45.google.com ([209.85.208.45]:43597 "EHLO mail-ed1-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229477AbhISTXC (ORCPT ); Sun, 19 Sep 2021 15:23:02 -0400 Received: by mail-ed1-f45.google.com with SMTP id n10so51395777eda.10; Sun, 19 Sep 2021 12:21:36 -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=YPQno8A85O4WeBnY/bkDmDISB83i8fh43dkMBVfbagg=; b=Wv5zk3qmRhU6wk38WDi5IUQM0oQe4ATvmqg+6PE9Q4TC+9cQY3WWah6myn8GlWp/6i fKfXqP34u0iPHd0kvfcAHb/aR/6mkRSmevwIzb4TCUxcWL6HKDp8NTIgYREc0PbXNsV0 eujsMzSCxNZcwt61z4mbgzITKOb9wA/moELMBQ2k7pMMPq6SI+aaWXIciD35hA3oLbBk TgNje/nQ5kbCrZE3V4WP1QbnckfgSaT929OFIMBZuJD3Tt5ZZ9/YESVyMU6vo0L5Xe77 nBF/X19J59T1wsc3RleVX3LMG+ZR25FXguZBqve8gTBAwSfPpoOAMFKX+pH/C9SBDoGG OONQ== X-Gm-Message-State: AOAM5337B1V+D2/MiF5BiVnTtHat638cH9+0b+lbMwlbgoz0Uj7iGsEZ ic0D4gWU1uS3uwxNtn+WjSE= X-Google-Smtp-Source: ABdhPJw6bKrJh6VBPCsEdw0Z3ZJq549XyeLF8IcT+WCASbLSolRQjT+vBCfpq9w+BytaqdW8R4vjng== X-Received: by 2002:a17:906:6dd4:: with SMTP id j20mr24232036ejt.316.1632079295730; Sun, 19 Sep 2021 12:21:35 -0700 (PDT) Received: from turbo.teknoraver.net (net-2-34-36-22.cust.vodafonedsl.it. [2.34.36.22]) by smtp.gmail.com with ESMTPSA id 10sm5208525eju.12.2021.09.19.12.21.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Sep 2021 12:21:35 -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 v4 0/3] riscv: optimized mem* functions Date: Sun, 19 Sep 2021 21:21:01 +0200 Message-Id: <20210919192104.98592-1-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. v3 -> v4: - incorporate changes from proposed generic version: https://lore.kernel.org/lkml/20210617152754.17960-1-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