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[174.21.143.238]) by smtp.gmail.com with ESMTPSA id s188sm6550634pfb.118.2020.06.19.14.16.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Jun 2020 14:16:24 -0700 (PDT) Subject: Re: [PATCH 2/6] target/ppc: add vmulld instruction To: Lijun Pan References: <20200613042029.22321-1-ljp@linux.ibm.com> <20200613042029.22321-3-ljp@linux.ibm.com> <4341c9e1-162f-d640-e733-d69d2f894353@linaro.org> From: Richard Henderson Message-ID: Date: Fri, 19 Jun 2020 14:16:22 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 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::642; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x642.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_HELO_NONE=0.001, SPF_PASS=-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-ppc@nongnu.org, Lijun Pan , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/18/20 10:30 PM, Lijun Pan wrote: > Why do we need to convert > to tcg_gen_gvec_mul, which seems to me very convoluted? Because that way we can generate a single host vector multiply instruction in the compiled translation block. r~