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[189.204.200.163]) by smtp.gmail.com with ESMTPSA id d11sm3408184qkk.110.2021.05.13.16.54.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 May 2021 16:54:59 -0700 (PDT) Subject: Re: [PATCH 00/72] Convert floatx80 and float128 to FloatParts To: =?UTF-8?Q?Alex_Benn=c3=a9e?= References: <20210508014802.892561-1-richard.henderson@linaro.org> <878s4jg3hf.fsf@linaro.org> <87o8delokc.fsf@linaro.org> From: Richard Henderson Message-ID: Date: Thu, 13 May 2021 18:54:57 -0500 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: <87o8delokc.fsf@linaro.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::830; envelope-from=richard.henderson@linaro.org; helo=mail-qt1-x830.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: , Cc: qemu-devel@nongnu.org, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/13/21 8:33 AM, Alex Bennée wrote: >> Now add and mul columns are going down when the only change is to >> muladd? Is this just more noise? > > Running again more times I think it is a real effect: I don't believe it. If source code for a given function is not changing then the generated code should not change (much, especially with FLATTEN), and thus the runtime should not change (much). Are you absolutely sure that you're measuring what you think you are measuring? Is your compiler mis-behaving somehow and not inlining stuff? r~