From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9EAADC433B4 for ; Wed, 12 May 2021 18:34:08 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0CCE461285 for ; Wed, 12 May 2021 18:34:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0CCE461285 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60526 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lgtgM-0000pr-VR for qemu-devel@archiver.kernel.org; Wed, 12 May 2021 14:34:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45626) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lgtTc-0000s6-Jd for qemu-devel@nongnu.org; Wed, 12 May 2021 14:20:56 -0400 Received: from indium.canonical.com ([91.189.90.7]:35408) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lgtTZ-0004A2-1r for qemu-devel@nongnu.org; Wed, 12 May 2021 14:20:56 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lgtTV-0002dY-EM for ; Wed, 12 May 2021 18:20:49 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 21E942E818D for ; Wed, 12 May 2021 18:20:49 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 12 May 2021 18:11:42 -0000 From: Thomas Huth <1912934@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Incomplete; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: ppc tcg X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: bruno-clisp th-huth X-Launchpad-Bug-Reporter: Bruno Haible (bruno-clisp) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <161147764119.28788.10484645020687886149.malonedeb@soybean.canonical.com> Message-Id: <162084310307.6991.12481766424666379166.malone@gac.canonical.com> Subject: [Bug 1912934] Re: QEMU emulation of fmadds instruction on powerpc64le is buggy 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="6b3403d85f09252210977b936e821c0b00dbe016"; Instance="production" X-Launchpad-Hash: 2772caf1d71527fb9fc53c28c9518668bf8d4b10 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=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 1912934 <1912934@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The QEMU project is currently moving its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting the bug state to "Incomplete" now. If the bug has already been fixed in the latest upstream version of QEMU, then please close this ticket as "Fix released". If it is not fixed yet and you think that this bug report here is still valid, then you have two options: 1) If you already have an account on gitlab.com, please open a new ticket for this problem in our new tracker here: https://gitlab.com/qemu-project/qemu/-/issues and then close this ticket here on Launchpad (or let it expire auto- matically after 60 days). Please mention the URL of this bug ticket on Launchpad in the new ticket on GitLab. 2) If you don't have an account on gitlab.com and don't intend to get one, but still would like to keep this ticket opened, then please switch the state back to "New" or "Confirmed" within the next 60 days (other- wise it will get closed as "Expired"). We will then eventually migrate the ticket automatically to the new system (but you won't be the reporter of the bug in the new system and thus you won't get notified on changes anymore). Thank you and sorry for the inconvenience. ** Tags added: ppc tcg ** Changed in: qemu Status: New =3D> Incomplete -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1912934 Title: QEMU emulation of fmadds instruction on powerpc64le is buggy Status in QEMU: Incomplete Bug description: The attached program test-fmadds.c tests the fmadds instruction on powerpc64le. Result on real hardware (POWER8E processor): $ ./a.out ; echo $? 0 Result in Alpine Linux 3.13/powerpcle, emulated by QEMU 5.0.0 on Ubuntu 1= 6.04: $ ./a.out ; echo $? 32 Result in Debian 8.6.0/ppc64el, emulated by QEMU 2.9.0 on Ubuntu 16.04: $ ./a.out ; echo $? 32 Through 'nm --dynamic qemu-system-ppc64 | grep fma' I can see that QEMU is NOT using the fmaf() or fma() function from the host system's libc; this function is working fine in glibc of the host system (see https://www.gnu.org/software/gnulib/manual/html_node/fmaf.html ). To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1912934/+subscriptions