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[174.24.157.40]) by smtp.googlemail.com with ESMTPSA id 58sm8681471qtz.33.2016.10.24.08.43.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Oct 2016 08:43:39 -0700 (PDT) To: vijay.kilari@gmail.com, qemu-arm@nongnu.org, peter.maydell@linaro.org, pbonzini@redhat.com References: <1477288523-10819-1-git-send-email-vijay.kilari@gmail.com> <1477288523-10819-2-git-send-email-vijay.kilari@gmail.com> From: Richard Henderson Message-ID: Date: Mon, 24 Oct 2016 08:43:36 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <1477288523-10819-2-git-send-email-vijay.kilari@gmail.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2607:f8b0:400d:c09::242 Subject: Re: [Qemu-devel] [PATCH v3 1/3] cutils: Set __builtin_prefetch optional parameters X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, Vijaya Kumar K Errors-To: qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-devel" X-TUID: wM7y/NjiX6Yo On 10/23/2016 10:55 PM, vijay.kilari@gmail.com wrote: > From: Vijaya Kumar K > > Optional parameters of __builtin_prefetch() which specifies > rw and locality to 0's. For checking buffer is zero, set rw as read > and temporal locality to 0. > > On arm64, __builtin_prefetch(addr) generates 'prfm pldl1keep' > where __builtin_prefetch(addr, 0, 0) generates 'prfm pldl1strm' > instruction which is optimal for this use case > > Signed-off-by: Vijaya Kumar K > --- Reviewed-by: Richard Henderson r~