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[189.204.159.168]) by smtp.gmail.com with ESMTPSA id j10sm2918824ota.56.2020.10.09.05.59.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 Oct 2020 05:59:32 -0700 (PDT) Subject: Re: [RFC PATCH v3 26/34] Hexagon (target/hexagon) macros referenced in instruction semantics To: Taylor Simpson , "qemu-devel@nongnu.org" References: <1597765847-16637-1-git-send-email-tsimpson@quicinc.com> <1597765847-16637-27-git-send-email-tsimpson@quicinc.com> <75d5275b-76e5-38a5-f9a3-f36d1ee08c74@linaro.org> <7f0ae43c-97a0-3337-eac7-938a2f244d3d@linaro.org> From: Richard Henderson Message-ID: Date: Fri, 9 Oct 2020 07:59:29 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 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::244; envelope-from=richard.henderson@linaro.org; helo=mail-oi1-x244.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: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 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=-0.208, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "ale@rev.ng" , "riku.voipio@iki.fi" , "philmd@redhat.com" , "laurent@vivier.eu" , "aleksandar.m.mail@gmail.com" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 10/8/20 3:54 PM, Taylor Simpson wrote: > I'll reach out to the architects and ask if there is a case where doing the store first could be a problem - and also about the priority of exceptions. Of course there are cases where doing the store first will cause problems. > This may or may not be possible. We already have to reorder to put .new consumers after the producers, and we have to keep the change-of-flow instructions in the original order. So, I'm reluctant to go down this path worrying that there will be a long tail of corner case bugs to engineer out. Well, do as you like, I suppose, but I think the merging thing that you were trying to do is just as fraught with peril. r~