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=-5.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 6B12CC4363D for ; Wed, 23 Sep 2020 14:47:49 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 C2C43206FB for ; Wed, 23 Sep 2020 14:47:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="K83TfOin" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C2C43206FB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:39762 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kL63f-0002pV-GN for qemu-devel@archiver.kernel.org; Wed, 23 Sep 2020 10:47:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55660) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kL62O-0002Iv-4H for qemu-devel@nongnu.org; Wed, 23 Sep 2020 10:46:28 -0400 Received: from mail-pj1-x1044.google.com ([2607:f8b0:4864:20::1044]:37992) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kL62M-0007BH-CE for qemu-devel@nongnu.org; Wed, 23 Sep 2020 10:46:27 -0400 Received: by mail-pj1-x1044.google.com with SMTP id u3so3278909pjr.3 for ; Wed, 23 Sep 2020 07:46:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=HATRwnc/nm5QVVZvAFuvVMu82uedF2gD2RdkFq2tlKE=; b=K83TfOinY6unS3bE4CvHM8ePVuvb4f+ww0/e2gGXOtxuv7KfUmTiNDvtwMuUTyAJSx Ogn1t5OfuDaAO/h5RD9in8NnKxGBDqIi+5CALdfqJ2sIsGDGk95OEqyHA/x7YyAgcFoA NLODAIsL+c6wwmOF5tJ5SABf1Vgk6lvQfBB+yilHgYZa8NccmKRtehUzggGO0781ZiRG k801bbYPAdnQWYR4pXZBD6iTtx1/cU8uJ5a9oLjtaQC3ozD6w0/IqygI2xz3/9qvzWwv pLrifRGM9zzWqAFJfIF/Gasp4bSwwfrAC18E03aHxdXADER+GliJkXSiwffwX7ILbn0T NGKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=HATRwnc/nm5QVVZvAFuvVMu82uedF2gD2RdkFq2tlKE=; b=mURu+LLbg04F1GhXaqxShGSGV7km7FStLe/qtPr1H4oGqXNNqv6Xdv24SzEEPYfUVt ik78/jMc4liuZzAN2e0YmIzk19axt1TbGvTaI3psLJYOw2N2gcfjnka9CqQhW+8ftOHn ie10pUhHJQTm/jAm04xlbBZV/wt6CqjJ/YnYEX+n7eK7dT5fPkw1ZTUnywukO22KFl+D ODUzfxydyUzNvgjrfpMBqlGhCQrE5FmHCKp8scTapJIfM3S7Y76TKGn6fRW+uDsr/Gi4 SoezRBzPFNYjUj6eRcyNUkAqSr31lKJ1IeuetPOgRljxqcVNQhVEYTaWaRE2GkZy3/CO Nu1Q== X-Gm-Message-State: AOAM530PovP5Kzl++7RTP5IchsyMCb5ZpxPd1UxQu4+JxbhovjChCmSc PeK5RHpPZXQftm9Nq6WPnT/HTQ== X-Google-Smtp-Source: ABdhPJxRtVXrdf1Pn4I77wTqfTjP2rXqP3ReZzvEnypPJVGESP5VFDVTIlPvhJiJ1+CJ2V3lHAzAAg== X-Received: by 2002:a17:90a:ab8f:: with SMTP id n15mr8385113pjq.139.1600872384950; Wed, 23 Sep 2020 07:46:24 -0700 (PDT) Received: from [192.168.1.11] ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id t186sm174968pgc.49.2020.09.23.07.46.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Sep 2020 07:46:23 -0700 (PDT) Subject: Re: [PATCH v3 51/81] target/arm: Pass separate addend to {U, S}DOT helpers To: LIU Zhiwei , qemu-devel@nongnu.org References: <20200918183751.2787647-1-richard.henderson@linaro.org> <20200918183751.2787647-52-richard.henderson@linaro.org> From: Richard Henderson Message-ID: <300c780c-0167-0a87-58b9-2fff8ab91190@linaro.org> Date: Wed, 23 Sep 2020 07:46:21 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1044; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1044.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 9/23/20 3:01 AM, LIU Zhiwei wrote: > > > On 2020/9/19 2:37, Richard Henderson wrote: >> For SVE, we potentially have a 4th argument coming from the >> movprfx instruction.  Currently we do not optimize movprfx, >> so the problem is not visible. > Hi Richard, > > I am a little confused.  If it is not immediately preceded by a MOVPRFX > instruction, the addend will > still be used. > > Is it right? If movprfx is not used, then the addend register will be the same as the destination register. r~