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[174.21.143.238]) by smtp.gmail.com with ESMTPSA id d4sm902663pgk.2.2020.05.19.22.39.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 19 May 2020 22:39:15 -0700 (PDT) Subject: Re: [RFC PATCH 1/8] riscv: Add RV64I instructions description To: LIU Zhiwei , peter.maydell@linaro.org References: <20200430072139.4602-1-zhiwei_liu@c-sky.com> <20200430072139.4602-2-zhiwei_liu@c-sky.com> From: Richard Henderson Message-ID: <3f84427c-8978-0e36-f4e8-d498e15ead20@linaro.org> Date: Tue, 19 May 2020 22:39:13 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 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::442; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x442.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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, qemu-devel@nongnu.org, wxy194768@alibaba-inc.com, wenmeng_zhang@c-sky.com, palmer@dabbelt.com, alistair23@gmail.com, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/19/20 7:41 PM, LIU Zhiwei wrote: >> Since all of sp, gp, tp are not in risu's control, why is rs1 only excluding >> sp, and not gp and tp as well? > When I test the patch set, I find gp and tp will be the same in slave and master， > so they can be used as source register. Ah, try again with different builds of risu, e.g. one with -O2 and one with -O0. I think you will find that these values are set by the linker for the image. r~