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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 40300C433B4 for ; Mon, 17 May 2021 14:49:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 26F1A61074 for ; Mon, 17 May 2021 14:49:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241409AbhEQOu6 (ORCPT ); Mon, 17 May 2021 10:50:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:40386 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241654AbhEQOs5 (ORCPT ); Mon, 17 May 2021 10:48:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9AD826197B; Mon, 17 May 2021 14:22:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621261356; bh=7oYuLHNwzc9jy8+tx7Q4sSHTjfKDMdJFbkcaYmc36R8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oBarlork61kYtLCbCwNWb3Wxldwqs1XAhIZtTyyBMSQj0p+Hf5KfGiXkMO/i3ZgzB jBtUk5u7GtuAWgLG0ETvO2yIte3l+14oIvm6IUiBCrLPB1KXopwbHD4aHFkmkqiJE0 FLuvzg3C9N+qc/eZedSF7rzq+UyUFow/ZmRd4lXg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Maciej W. Rozycki" , Thomas Bogendoerfer Subject: [PATCH 5.12 337/363] MIPS: Avoid DIVU in `__div64_32 is result would be zero Date: Mon, 17 May 2021 16:03:23 +0200 Message-Id: <20210517140314.004843053@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.508966430@linuxfoundation.org> References: <20210517140302.508966430@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Maciej W. Rozycki commit c1d337d45ec0a802299688e17d568c4e3a585895 upstream. We already check the high part of the divident against zero to avoid the costly DIVU instruction in that case, needed to reduce the high part of the divident, so we may well check against the divisor instead and set the high part of the quotient to zero right away. We need to treat the high part the divident in that case though as the remainder that would be calculated by the DIVU instruction we avoided. This has passed correctness verification with test_div64 and reduced the module's average execution time down to 1.0445s and 0.2619s from 1.0668s and 0.2629s respectively for an R3400 CPU @40MHz and a 5Kc CPU @160MHz. Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer Signed-off-by: Greg Kroah-Hartman --- arch/mips/include/asm/div64.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/arch/mips/include/asm/div64.h +++ b/arch/mips/include/asm/div64.h @@ -68,9 +68,11 @@ \ __high = __div >> 32; \ __low = __div; \ - __upper = __high; \ \ - if (__high) { \ + if (__high < __radix) { \ + __upper = __high; \ + __high = 0; \ + } else { \ __asm__("divu $0, %z1, %z2" \ : "=x" (__modquot) \ : "Jr" (__high), "Jr" (__radix)); \