From patchwork Tue May 9 02:22:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhangfei X-Patchwork-Id: 13235305 X-Patchwork-Delegate: palmer@dabbelt.com 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 907EAC77B75 for ; Tue, 9 May 2023 02:23:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Gvow+86ShZINI4ddsb1RTBGf8t1/Yc9yxplz6FC15Y0=; b=UvDoxUmpWDlshz qQWIfJoQ9MXB8I6QKOL2cihofvfEp7RMNQ6CZE/2ymwplkXaibK+t5ECHBiaS3dBMQEmQKKVDl2Bv LxB2sd8ksP1iZnKRx0sypwMIqk+kL0SbfCarYTndz3NpQl2hcn+BF+U8jKa963AAyigjWvLDfTJzt XRoWP+z/lBz5cT2wu0yZphvG5zpWf3zEM4hZpK+SPidq2p+WsjX8f4epe9q7VhbG6q7RvfYFvPidg KjGk5oReBU5TZq7ShAAejQQZiwLb2WkGVs6Qiqrx7F1LREmG2SnI2k8Fu/ykcj+ZXyPnSu8bMdiGV sy/bJBaFdZxOq6v1tszQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pwD0M-0026ct-29; Tue, 09 May 2023 02:23:06 +0000 Received: from m12.mail.163.com ([220.181.12.214]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pwD0K-0026bF-0J for linux-riscv@lists.infradead.org; Tue, 09 May 2023 02:23:05 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=B7r1H xceD8xEK8s87PGYO33d2ZP2EMjWFu6ZqdrIJYA=; b=ewLVubx1vuM7+F2HbEh6V RjjOdHi/nSWdQ/2WLQC1kQqlhrdBUjn+AS3iO1Cl3P/qjYbHFc1y3zO0hmmzArbF 9Cgc7Vdcq6whuRQIhEFyDje45wz+lPNhG/xh+qV7TeztGbge+JIrrPhZ+2HwAu3b l6ArpdN92sy3RAwZeyJsIw= Received: from zhangf-virtual-machine.localdomain (unknown [180.111.102.183]) by zwqz-smtp-mta-g3-4 (Coremail) with SMTP id _____wBXf4dSrllkqHhsBQ--.30265S3; Tue, 09 May 2023 10:22:13 +0800 (CST) From: zhangfei To: ajones@ventanamicro.com Cc: aou@eecs.berkeley.edu, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, paul.walmsley@sifive.com, zhangfei@nj.iscas.ac.cn Subject: [PATCH 2/2] riscv: Optimize memset Date: Tue, 9 May 2023 10:22:06 +0800 Message-Id: <20230509022207.3700-2-zhang_fei_0403@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230509022207.3700-1-zhang_fei_0403@163.com> References: <20230505-9ec599a36801972451e8b17f@orel> <20230509022207.3700-1-zhang_fei_0403@163.com> MIME-Version: 1.0 X-CM-TRANSID: _____wBXf4dSrllkqHhsBQ--.30265S3 X-Coremail-Antispam: 1Uf129KBjvdXoW7GryxZw13AF1kGw15JFW7twb_yoWDZwc_Jr WxCa97JFyDJFZ3Za9rtw15Kry8uFZ8KrykGF1Dtw1UG3WFkr13trWYqry5Ar18XwsrGay3 G3ZrJrWrXr1UGjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUeYNt3UUUUU== X-Originating-IP: [180.111.102.183] X-CM-SenderInfo: x2kd0w5bihxsiquqjqqrwthudrp/1tbiWxZql2I0Z8wmqwAAsA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230508_192304_464107_F6D0AA3E X-CRM114-Status: UNSURE ( 6.48 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: zhangfei This patch has been optimized for memset data sizes less than 16 bytes. Compared to byte by byte storage, significant performance improvement has been achieved. Signed-off-by: Fei Zhang --- arch/riscv/lib/memset.S | 33 ++++++++++++++++++++++++++++++--- 1 file changed, 30 insertions(+), 3 deletions(-) diff --git a/arch/riscv/lib/memset.S b/arch/riscv/lib/memset.S index e613c5c27998..6113a2696e79 100644 --- a/arch/riscv/lib/memset.S +++ b/arch/riscv/lib/memset.S @@ -106,9 +106,36 @@ WEAK(memset) beqz a2, 6f add a3, t0, a2 5: - sb a1, 0(t0) - addi t0, t0, 1 - bltu t0, a3, 5b + sb a1, 0(t0) + sb a1, -1(a3) + li a4, 2 + bgeu a4, a2, 6f + + sb a1, 1(t0) + sb a1, 2(t0) + sb a1, -2(a3) + sb a1, -3(a3) + li a4, 6 + bgeu a4, a2, 6f + + sb a1, 3(t0) + sb a1, -4(a3) + li a4, 8 + bgeu a4, a2, 6f + + sb a1, 4(t0) + sb a1, -5(a3) + li a4, 10 + bgeu a4, a2, 6f + + sb a1, 5(t0) + sb a1, 6(t0) + sb a1, -6(a3) + sb a1, -7(a3) + li a4, 14 + bgeu a4, a2, 6f + + sb a1, 7(t0) 6: ret END(__memset)