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[174.21.72.5]) by smtp.gmail.com with ESMTPSA id h8-20020a170902704800b001e868e29fabsm20147597plt.251.2024.04.29.05.31.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 29 Apr 2024 05:31:25 -0700 (PDT) Message-ID: <80f07930-e5e5-496b-ba08-6091ebe55c1e@linaro.org> Date: Mon, 29 Apr 2024 05:31:22 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 06/10] util/bufferiszero: Improve scalar variant To: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org References: <20240424225705.929812-1-richard.henderson@linaro.org> <20240424225705.929812-7-richard.henderson@linaro.org> <400f20e7-3c33-4916-897a-0d6b21d572c4@linaro.org> Content-Language: en-US From: Richard Henderson In-Reply-To: <400f20e7-3c33-4916-897a-0d6b21d572c4@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42f; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42f.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, 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 4/29/24 05:18, Philippe Mathieu-Daudé wrote: >> + >> +    t = ldq_he_p(buf) | ldq_he_p(buf + len - 8); > > Here we read #0 and #31, ... > >> +    p = QEMU_ALIGN_PTR_DOWN(buf + 8, 8); >> +    e = QEMU_ALIGN_PTR_DOWN(buf + len - 1, 8); >> + >> +    /* Read 0 to 31 aligned words from the middle. */ > > ... so here is #1 to #30? Not indexes, but count. There may be zero words remaining in the middle, etc. r~