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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 3AC99C433EF for ; Sat, 25 Dec 2021 22:02:53 +0000 (UTC) Received: from localhost ([::1]:41782 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n1F7r-0004Yl-Sq for qemu-devel@archiver.kernel.org; Sat, 25 Dec 2021 17:02:51 -0500 Received: from eggs.gnu.org ([209.51.188.92]:34286) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n1F5q-0002I2-3D for qemu-devel@nongnu.org; Sat, 25 Dec 2021 17:00:50 -0500 Received: from [2607:f8b0:4864:20::52f] (port=41900 helo=mail-pg1-x52f.google.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1n1F5m-0007xj-KS for qemu-devel@nongnu.org; Sat, 25 Dec 2021 17:00:45 -0500 Received: by mail-pg1-x52f.google.com with SMTP id f8so272507pgf.8 for ; Sat, 25 Dec 2021 14:00:33 -0800 (PST) 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=huojoUY6Ut1L3Ad37ePmEFVp69bi+GgWjz+LBsWI8I4=; b=rG+QkeLACkFycXwmZ5gZsUUhOQ2vo8/N+jGlESo/TA+K7euFt/wx6gejtG/8EFBFFX tdLWDukH1kSvYGafxWHM9ORtGWJCy7TOtuxg2m8A2Nzt4M2e6bAMkK8m0qhPPDObMreX 6Lg1DekmCOss6wyFNVNRDH4IpxQxSJ4VCMKJAYwKxd9AZDTvnhnTC9lmgMfVuxyn4xBV 6Toqq0gIKTOXlKVN9UAPdgCbF5kffYZGPS3+MviVRX+5g1M8p0xzGpFz07/npPyApWP9 reHFJjPP/G94/9JJM7QVfD1K3eaUmDs1XJdWXzol9RwhiPwJYyQx72g4HeFztC3ERhM1 W+9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=huojoUY6Ut1L3Ad37ePmEFVp69bi+GgWjz+LBsWI8I4=; b=0cw6vWCq5VnU4xl6wE4cel7kpCDBo3EA2DGggrlvo+OAe7fvc6mHP92lqNFNXBISBG KSvsTHHjrEkYmeEMkpVYDYHQdY2qOK2yluY2N0n0t4m6xWAk+tT8fyw+HIO1WJfpx++Z D3MuJl80AKrFO6va6lLCHlgQKsYlQMJE+KHMeb29kX5nGBd80ufyUHuAbGSefzl9lKW+ M6bSwHelcEX/86yn6dmKqB0aKdRK/kIa2kZz2Nrkh9DxpHbEQ9qXE+F1aSFy7Qa0S099 UadfZYJ2+wGWNMvr3uqSzjGA75alq7gyZOleKrj3gDs2HYApxuSRZ7AIhrG7ftO9bCbZ uj7A== X-Gm-Message-State: AOAM531Wi4ztiWecv1mT1MpPqgLzUyp8GtH9vKtOf2Rw8dltTT6d+qd1 gnW8iAacZ4JiEAicZ9le4xI4Gg== X-Google-Smtp-Source: ABdhPJyBrzkTXsAt6/bxvyH0Tl1viRjUYGyzfh69C/tpIJ/k7V0xHFxGrnjd0OK3bZ7vbUTNuVTkMw== X-Received: by 2002:a65:5547:: with SMTP id t7mr10700549pgr.510.1640469632299; Sat, 25 Dec 2021 14:00:32 -0800 (PST) Received: from [172.20.100.20] ([156.19.246.20]) by smtp.gmail.com with ESMTPSA id u3sm12977478pfk.82.2021.12.25.14.00.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 25 Dec 2021 14:00:31 -0800 (PST) Subject: Re: [PATCH 2/6] target/riscv: add support for unique fpr read/write with support for zfinx To: liweiwei , palmer@dabbelt.com, alistair.francis@wdc.com, bin.meng@windriver.com, qemu-riscv@nongnu.org, qemu-devel@nongnu.org References: <20211224034915.17204-1-liweiwei@iscas.ac.cn> <20211224034915.17204-3-liweiwei@iscas.ac.cn> <2acd9ead-d9e8-46be-b306-2aa26ced06b5@iscas.ac.cn> From: Richard Henderson Message-ID: Date: Sat, 25 Dec 2021 14:00:29 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <2acd9ead-d9e8-46be-b306-2aa26ced06b5@iscas.ac.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::52f (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::52f; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x52f.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 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=-0.196, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wangjunqiang@iscas.ac.cn, lazyparser@gmail.com, ardxwe@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 12/24/21 7:13 PM, liweiwei wrote: > In RV64 case, this should be nan-boxing value( upper bits are all ones).  However, zfinx > will not check nan-boxing of source, the upper 32 bits have no effect on the final result. > So I think both zero-extended or sign-extended are OK. There is no nanboxing in zfinx at all -- values are sign-extended. r~