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[97.126.123.70]) by smtp.gmail.com with ESMTPSA id t11sm1334743pgi.15.2020.02.12.11.52.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 12 Feb 2020 11:52:40 -0800 (PST) Subject: Re: [PATCH 2/2] target/arm: Use tcg_gen_gvec_5_ptr for sve FMLA/FCMLA To: =?UTF-8?Q?Alex_Benn=c3=a9e?= References: <20200212025145.24300-1-richard.henderson@linaro.org> <20200212025145.24300-3-richard.henderson@linaro.org> <87h7zwxenx.fsf@zen.linaroharston> From: Richard Henderson Message-ID: <125be513-4309-a44f-0551-8864cccb25b6@linaro.org> Date: Wed, 12 Feb 2020 11:52:38 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <87h7zwxenx.fsf@zen.linaroharston> 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::1041 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, tsimpson@quicinc.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/12/20 2:50 AM, Alex Bennée wrote: > > Richard Henderson writes: > >> Now that we can pass 7 parameters, do not encode register >> operands within simd_data. > > What defines the upper limit? Is it the ABI of the backend or just the > efficiency of implementing the prologue for the call? The current upper limit is from the lifetime tracking data. Which gives us 14 arguments within the bits of the uint16_t. Which gives us 7 uint64_t arguments on a 32-bit host. r~