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=-5.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 6A6A2C43603 for ; Wed, 11 Dec 2019 13:56:29 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 3C56922B48 for ; Wed, 11 Dec 2019 13:56:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JXkjXJKJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3C56922B48 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=iogearbox.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QKTdnoeGwRiUUvaf3NqCwg1yCPef8d5A8wEzp+2/kxg=; b=JXkjXJKJDCzQ67 zEVVo87HoCWRRQDbAy7nkKWtWAWNAG5OLl5TPi13qUWbBJSGCePasboCLPyzLijYNd8gQlsnfvBRB YURkTRZanG3ktWm77BipzbnVHUr+7xIzG1ffYRjS9u+Xk3aSiHu4x5G00LPGcVePAamLGOQdoVzIV RCSgJ4tKhAF1lkdqQGwJficY0a+PacZTbHwFF6SM+VrZbsufpsFNqx5YAI7s78SK09goddjywFQ0B ZApFE4SfnVrAsHteuGRkC7m4SjEHs2OGw5nd3vz1oicUVBqn2JDGo+33snYAaFk71Nzd4UYmlhndh 6KVp4tYWnNcgXDQh8BiA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1if2Tc-00053I-LN; Wed, 11 Dec 2019 13:56:28 +0000 Received: from www62.your-server.de ([213.133.104.62]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1if2Ta-00052S-HR for linux-arm-kernel@lists.infradead.org; Wed, 11 Dec 2019 13:56:27 +0000 Received: from [2001:1620:665:0:5795:5b0a:e5d5:5944] (helo=localhost) by www62.your-server.de with esmtpsa (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1if2TP-0007p8-I9; Wed, 11 Dec 2019 14:56:15 +0100 Date: Wed, 11 Dec 2019 14:56:15 +0100 From: Daniel Borkmann To: Russell King Subject: Re: [PATCH] ARM: net: bpf: improve prologue code sequence Message-ID: <20191211135615.GA25011@linux.fritz.box> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Authenticated-Sender: daniel@iogearbox.net X-Virus-Scanned: Clear (ClamAV 0.101.4/25660/Wed Dec 11 10:47:07 2019) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191211_055626_577244_1AD820B3 X-CRM114-Status: UNSURE ( 7.70 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , netdev@vger.kernel.org, Alexei Starovoitov , Shubham Bansal , Yonghong Song , bpf@vger.kernel.org, Andrii Nakryiko , Martin KaFai Lau , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Dec 09, 2019 at 11:17:30AM +0000, Russell King wrote: > Improve the prologue code sequence to be able to take advantage of > 64-bit stores, changing the code from: > > push {r4, r5, r6, r7, r8, r9, fp, lr} > mov fp, sp > sub ip, sp, #80 ; 0x50 > sub sp, sp, #600 ; 0x258 > str ip, [fp, #-100] ; 0xffffff9c > mov r6, #0 > str r6, [fp, #-96] ; 0xffffffa0 > mov r4, #0 > mov r3, r4 > mov r2, r0 > str r4, [fp, #-104] ; 0xffffff98 > str r4, [fp, #-108] ; 0xffffff94 > > to the tighter: > > push {r4, r5, r6, r7, r8, r9, fp, lr} > mov fp, sp > mov r3, #0 > sub r2, sp, #80 ; 0x50 > sub sp, sp, #600 ; 0x258 > strd r2, [fp, #-100] ; 0xffffff9c > mov r2, #0 > strd r2, [fp, #-108] ; 0xffffff94 > mov r2, r0 > > resulting in a saving of three instructions. > > Signed-off-by: Russell King Applied, thanks! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel