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[173.130.215.183]) by smtp.gmail.com with ESMTPSA id o11sm13113027vkf.13.2019.05.23.06.16.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 23 May 2019 06:16:25 -0700 (PDT) To: Peter Maydell References: <20190518191934.21887-1-richard.henderson@linaro.org> <20190518191934.21887-3-richard.henderson@linaro.org> From: Richard Henderson Openpgp: preference=signencrypt Message-ID: <13d9e22b-4ac5-fb87-622c-a99b5494d06c@linaro.org> Date: Thu, 23 May 2019 09:16:21 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::943 Subject: Re: [Qemu-devel] [PATCH 2/2] target/arm: Use tcg_gen_gvec_bitsel X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-arm , QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/23/19 9:08 AM, Peter Maydell wrote: >> Because the three different instructions perform the same operation with >> reshuffled register arguments. > > Ah, so they do. Next question, how do I find out what the > order of arguments in the above code means so I can compare > it against the pseudocode expression we're implementing? >>From tcg/README: * bitsel_vec v0, v1, v2, v3 Bitwise select, v0 = (v2 & v1) | (v3 & ~v1), across the entire vector. The "selector" is second, the first input operand. r~