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[37.24.10.236]) by smtp.gmail.com with ESMTPSA id iv8-20020a05600c548800b003f09e294d5esm903560wmb.6.2023.04.11.23.41.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Apr 2023 23:41:42 -0700 (PDT) Message-ID: <115fd30e-71ce-aa80-0391-63fbba7899b9@linaro.org> Date: Wed, 12 Apr 2023 08:41:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.0 Subject: Re: [PATCH] Hexagon (target/hexagon) Add overrides for cache/sync/barrier instructions To: Taylor Simpson , "qemu-devel@nongnu.org" Cc: "philmd@linaro.org" , "ale@rev.ng" , "anjo@rev.ng" , Brian Cain , "Matheus Bernardino (QUIC)" References: <20230410202402.2856852-1-tsimpson@quicinc.com> <0d07641e-f37d-3589-58c9-d992ab70a985@linaro.org> Content-Language: en-US From: Richard Henderson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::32d; envelope-from=richard.henderson@linaro.org; helo=mail-wm1-x32d.google.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 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=-2.17, 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 4/11/23 04:29, Taylor Simpson wrote: >> These variables could be moved to DisasContext and allocated on demand. >> Even recently this was tedious, because of TCG temporary lifetime issues, >> but no longer. > > I'll work on this. The obvious advantage is to allow the TCG optimizer more opportunity to fold copies and propagate constants. > > Any other advantage? Once the packet is complete, the value is discarded, rather than written back to env. r~