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Wed, 25 Aug 2021 07:25:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=launchpad.net; s=20210803; t=1629876344; bh=DjLOVvNgKSWiayJZqIzVzzsqbhLzXm3xXQAuip5pBy0=; h=MIME-Version:Content-Type:Date:From:To:Reply-To:References: Message-Id:Subject; b=oV98Fng5FzWHoUieBFdp2Ka8mveybMF0WmY2DOldqOuGvMMpUDEjgYKL5u78LOo+N jLSPbhbvghF+YzqE6Y+LtGYBactY41Jeh8DjyjXsmWwxHMpsQbF4XsyoLfDZK9mvc+ iRx30Ivp0ko0hD+/hxBRgJ2GigiKbk8T5RTndlfsA+nD9boIXY3J1qxbVVTsaaSd6Q Wfcmkun8t0gXdFnmDXpGHGdlejpvoQLPfpN0Y2Kid1MfyIa8w5aY3Uyy/WKpi9kcne 8UE/EQq6Y5cT0GixG85OZctZ0shUGiXfwmTCxQwZGp5FN2fA4qX+2U1P1IpwYSglPD aXX41z0zlfygA== Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 3D21D2E8136 for ; Wed, 25 Aug 2021 07:25:44 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 25 Aug 2021 07:17:37 -0000 From: Thomas Huth <1892081@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Fix Released; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: ahmedkrmn rth th-huth X-Launchpad-Bug-Reporter: Ahmed Karaman (ahmedkrmn) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <159777580973.2034.8843080316751302000.malonedeb@chaenomeles.canonical.com> Message-Id: <162987585893.22371.14486060803131494077.launchpad@soybean.canonical.com> Subject: [Bug 1892081] Re: Performance improvement when using "QEMU_FLATTEN" with softfloat type conversions X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="7edb2d45353e030166106ae05838b77ab406edcd"; Instance="production" X-Launchpad-Hash: 9f6f270d6b6575d6b17fe61e41dbd1908a9a78c1 Received-SPF: pass client-ip=185.125.188.250; envelope-from=noreply@launchpad.net; helo=smtp-relay-services-0.canonical.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1892081 <1892081@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" ** Changed in: qemu Status: Fix Committed =3D> Fix Released --=20 You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1892081 Title: Performance improvement when using "QEMU_FLATTEN" with softfloat type conversions Status in QEMU: Fix Released Bug description: Attached below is a matrix multiplication program for double data types. The program performs the casting operation "(double)rand()" when generating random numbers. This operation calls the integer to float softfloat conversion function "int32_to_float_64". Adding the "QEMU_FLATTEN" attribute to the function definition decreases the instructions per call of the function by about 63%. Attached are before and after performance screenshots from KCachegrind. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1892081/+subscriptions