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[95.126.179.60]) by smtp.gmail.com with ESMTPSA id h16sm11853201wrm.27.2021.11.14.01.07.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 14 Nov 2021 01:07:42 -0800 (PST) Subject: Re: ppc/fpu_helper.c To: luoyonggang@gmail.com, qemu-ppc@nongnu.org, qemu-level References: From: Richard Henderson Message-ID: <77cac06d-f68f-ec30-5c7e-0d32a49a162d@linaro.org> Date: Sun, 14 Nov 2021 10:07:39 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: 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 2a00:1450:4864:20::42c (failed) Received-SPF: pass client-ip=2a00:1450:4864:20::42c; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x42c.google.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 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=-3.402, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/13/21 11:07 AM, 罗勇刚(Yonggang Luo) wrote: > I've seen nothing in fpu_helper.c to update > the fpscr to FP_FR, > that is there is no code with `fpscr |= FP_FR`, > is that valid for PowerPC? or it's just because this is hard > to implement and then the FP_FR  are always not set  for  fpscr It is unimplemented, yes. I think that no one has spent the time; I don't think that it should be hard, necessarily. r~