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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 DFF5EC4338F for ; Sun, 15 Aug 2021 06:51:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BD20460F11 for ; Sun, 15 Aug 2021 06:51:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236103AbhHOGwD (ORCPT ); Sun, 15 Aug 2021 02:52:03 -0400 Received: from mail-out.m-online.net ([212.18.0.9]:57920 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235870AbhHOGvy (ORCPT ); Sun, 15 Aug 2021 02:51:54 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4GnScm1Dk2z1qwGb; Sun, 15 Aug 2021 08:51:20 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 4GnScl6phrz1qqkg; Sun, 15 Aug 2021 08:51:19 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id hHSQV9_8Ah4W; Sun, 15 Aug 2021 08:51:18 +0200 (CEST) X-Auth-Info: GWNgGf1u5wZ3SJAJGg4o0/Ef+Whqz2y6LrK66NNI+d1HWkCmWlUNECf3gZjZXuRE Received: from tiger.home (ppp-46-244-191-201.dynamic.mnet-online.de [46.244.191.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Sun, 15 Aug 2021 08:51:18 +0200 (CEST) Received: by tiger.home (Postfix, from userid 1000) id 286DA5153E; Sun, 15 Aug 2021 08:51:18 +0200 (CEST) From: Andreas Schwab To: Akira Tsukamoto Cc: Paul Walmsley , Palmer Dabbelt , Guenter Roeck , Geert Uytterhoeven , Qiu Wenbo , Albert Ou , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/1] riscv: __asm_copy_to-from_user: Improve using word copy if size < 9*SZREG References: <65f08f01-d4ce-75c2-030b-f8759003e061@gmail.com> X-Yow: ..Am I in a SOAP OPERA?? Date: Sun, 15 Aug 2021 08:51:18 +0200 In-Reply-To: (Akira Tsukamoto's message of "Fri, 30 Jul 2021 22:52:44 +0900") Message-ID: <87bl5z42vt.fsf@linux-m68k.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Jul 30 2021, Akira Tsukamoto wrote: > .Lword_copy: > - /* > - * Both src and dst are aligned, unrolled word copy > + /* > + * Both src and dst are aligned > + * None unrolled word copy with every 1*SZREG iteration > + * > + * a0 - start of aligned dst > + * a1 - start of aligned src > + * t0 - end of aligned dst > + */ > + bgeu a0, t0, .Lbyte_copy_tail /* check if end of copy */ > + addi t0, t0, -(SZREG) /* not to over run */ > +1: > + REG_L a5, 0(a1) > + addi a1, a1, SZREG > + REG_S a5, 0(a0) > + addi a0, a0, SZREG > + bltu a0, t0, 1b This is missing fixups. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."