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[76.14.210.194]) by smtp.gmail.com with ESMTPSA id 5-20020a630705000000b0047911890728sm9411781pgh.79.2022.12.28.19.13.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 28 Dec 2022 19:13:41 -0800 (PST) Message-ID: <27113bcc-c8f9-02cb-c218-bb11e8d5d794@linaro.org> Date: Wed, 28 Dec 2022 19:13:39 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Subject: Re: [RFC PATCH 01/43] target/loongarch: Add vector data type vec_t Content-Language: en-US To: gaosong , qemu-devel@nongnu.org References: <20221224081633.4185445-1-gaosong@loongson.cn> <20221224081633.4185445-2-gaosong@loongson.cn> <99e4fdf2-fe70-03c7-1168-f300ac7a1ead@linaro.org> <4852b017-1841-cf6f-fbc2-e1789a7f9496@loongson.cn> <2544efc0-5eaa-31d3-99a1-95155d0f7859@loongson.cn> From: Richard Henderson In-Reply-To: <2544efc0-5eaa-31d3-99a1-95155d0f7859@loongson.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::102d; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102d.google.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 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=-1.147, RCVD_IN_DNSWL_NONE=-0.0001, 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 12/28/22 17:51, gaosong wrote: >> A related question though: does the manual mention whether the fpu instructions only >> modify the lower 64 bits, or do the high 64-bits become zeroed, nanboxed, or unspecified? >> >> > Only modify the lower 64bits,   the high 64-bits is unpecified. These two options are mutually exclusive. If upper 64 bits unmodified, then they *are* specified to be the previous contents. r~