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[174.21.70.228]) by smtp.gmail.com with ESMTPSA id h36sm187268pgh.63.2021.05.26.13.15.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 May 2021 13:15:35 -0700 (PDT) Subject: Re: Denormal input handling To: morrell@alumni.ucsd.edu, qemu-devel@nongnu.org References: <746277332.296230.1622055775751.ref@mail.yahoo.com> <746277332.296230.1622055775751@mail.yahoo.com> <4bc4444e-782a-311c-719d-091a04e20387@linaro.org> <1098669241.332748.1622058749094@mail.yahoo.com> From: Richard Henderson Message-ID: Date: Wed, 26 May 2021 13:15:33 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <1098669241.332748.1622058749094@mail.yahoo.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42d; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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=-0.001, 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" > So, DE should not be set for a denormal input if DAZ is set (it is set only > when DAZ is 0 -- the default "IEEE mode"). It's not my day is it? Clearly the bit that I quoted is wrt to the output denormal flushing. But my suggested fix is still not wrong -- have two bits that cover both alternatives. > Can you point me to the ARM documentation? https://developer.arm.com/documentation/ddi0487/latest Section D1.12.6 Floating point exceptions and exception traps, subsection Input Denormal exceptions. r~