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[187.189.51.144]) by smtp.gmail.com with ESMTPSA id s23sm725583oot.0.2020.12.16.10.31.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Dec 2020 10:31:51 -0800 (PST) Subject: Re: [RFC v2 15/15] target/riscv: rvb: support and turn on B-extension from command line To: Kito Cheng , Frank Chang References: <20201216020150.3157-1-frank.chang@sifive.com> <20201216020150.3157-16-frank.chang@sifive.com> From: Richard Henderson Message-ID: <8bbf77c9-4346-a603-a8c7-7b2d3127b246@linaro.org> Date: Wed, 16 Dec 2020 12:31:48 -0600 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: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::232; envelope-from=richard.henderson@linaro.org; helo=mail-oi1-x232.google.com 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=unavailable 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: qemu-riscv@nongnu.org, Sagar Karandikar , Bastian Koppelmann , qemu-devel@nongnu.org, Alistair Francis , Palmer Dabbelt Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 12/16/20 3:14 AM, Kito Cheng wrote: > Hi Alistair, Frank: > > Should we add the bext_spec option like Vector-ext? I would suggest > adding one to align the behavior between V and B. > But I have no strong opinion for this. > I don't think there's any point in that. The experimental extension will be updated without backward compatibility until it reaches 1.0. After which we could add one, *if* we expected there to be future incompatible changes. r~