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Thu, 19 Nov 2020 11:03:50 -0800 (PST) Received: from [192.168.1.11] ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id y5sm394023pja.52.2020.11.19.11.03.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 19 Nov 2020 11:03:49 -0800 (PST) Subject: Re: [RFC 01/15] target/riscv: reformat @sh format encoding for B-extension To: frank.chang@sifive.com, qemu-devel@nongnu.org, qemu-riscv@nongnu.org References: <20201118083044.13992-1-frank.chang@sifive.com> <20201118083044.13992-2-frank.chang@sifive.com> From: Richard Henderson Message-ID: <5aeb4fd2-ecfe-8ddc-457d-d6feb9e533b4@linaro.org> Date: Thu, 19 Nov 2020 11:03:46 -0800 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: <20201118083044.13992-2-frank.chang@sifive.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::535; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x535.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: Palmer Dabbelt , Kito Cheng , Alistair Francis , Sagar Karandikar , Bastian Koppelmann Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/18/20 12:29 AM, frank.chang@sifive.com wrote: > -slli 00.... ...... ..... 001 ..... 0010011 @sh > -srli 00.... ...... ..... 101 ..... 0010011 @sh > -srai 01.... ...... ..... 101 ..... 0010011 @sh > +slli 000000 ...... ..... 001 ..... 0010011 @sh > +srli 000000 ...... ..... 101 ..... 0010011 @sh > +srai 010000 ...... ..... 101 ..... 0010011 @sh We need at least 7 bits here for rv128, if we ever get around to it. The code in trans_slli et al already eliminates numbers that are two large. In the rvb draft, only 5 bits are used in the uppermost field. Let's leave it at that. r~