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=-8.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 315A9C433ED for ; Sat, 15 May 2021 11:03:00 +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 CA321611CE for ; Sat, 15 May 2021 11:02:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CA321611CE 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]:45728 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lhs4Q-0004Ri-Qz for qemu-devel@archiver.kernel.org; Sat, 15 May 2021 07:02:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40934) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lhs2Q-00022E-Ab for qemu-devel@nongnu.org; Sat, 15 May 2021 07:00:54 -0400 Received: from indium.canonical.com ([91.189.90.7]:54726) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lhs2O-0000F9-Dj for qemu-devel@nongnu.org; Sat, 15 May 2021 07:00:54 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lhs2M-0007bT-Ng for ; Sat, 15 May 2021 11:00:50 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id B242A2E8186 for ; Sat, 15 May 2021 11:00:50 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sat, 15 May 2021 10:53:15 -0000 From: Thomas Huth <1912934@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Expired; 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: <162107599548.21648.16713984551732373990.malone@soybean.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="5321c3f40fa4d4b847f4e47fb766e7b95ed5036c"; Instance="production" X-Launchpad-Hash: 8b3cd07d9649ecf8d6b618aaf33d8ecf52f4e54a 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=0.248, 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" This is an automated cleanup. This bug report has been moved to QEMU's new bug tracker on gitlab.com and thus gets marked as 'expired' now. Please continue with the discussion here: https://gitlab.com/qemu-project/qemu/-/issues/312 ** Changed in: qemu Status: New =3D> Expired ** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #312 https://gitlab.com/qemu-project/qemu/-/issues/312 -- = 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: Expired 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