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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id x10sm2628081pjo.4.2019.08.28.09.39.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Aug 2019 09:39:26 -0700 (PDT) To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , liuzhiwei References: <1566959818-38369-1-git-send-email-zhiwei_liu@c-sky.com> <87k1ax64io.fsf@linaro.org> From: Richard Henderson Openpgp: preference=signencrypt Message-ID: <876d43a4-7e57-b1c0-11b4-db20798d2098@linaro.org> Date: Wed, 28 Aug 2019 09:39:24 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <87k1ax64io.fsf@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::644 Subject: Re: [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1 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: peter.maydell@linaro.org, palmer@sifive.com, qemu-riscv@nongnu.org, sagark@eecs.berkeley.edu, kbastian@mail.uni-paderborn.de, riku.voipio@iki.fi, qemu-devel@nongnu.org, laurent@vivier.eu, Alistair.Francis@wdc.com, aurelien@aurel32.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/28/19 2:08 AM, Alex Bennée wrote: > If you want to do vectors I suggest you look at the TCGvec types for > passing pointers to vector registers to helpers. In this case you will > want to ensure your vector registers are properly aligned. The risc-v vector extension is very different from any other existing vector extension. In particular, the locations of the vector elements vary dynamically. Except for certain special cases I doubt that risc-v can make direct use of the generic TCG vector support. r~