From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 123870 invoked by alias); 3 Dec 2015 12:28:52 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Received: (qmail 123859 invoked by uid 89); 3 Dec 2015 12:28:51 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Thu, 03 Dec 2015 12:28:50 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 0BBDA8E234; Thu, 3 Dec 2015 12:28:48 +0000 (UTC) Received: from [127.0.0.1] (ovpn01.gateway.prod.ext.ams2.redhat.com [10.39.146.11]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tB3CSl14016755; Thu, 3 Dec 2015 07:28:48 -0500 Message-ID: <5660357F.4030605@redhat.com> Date: Thu, 03 Dec 2015 12:28:00 -0000 From: Pedro Alves User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Ruslan Kabatsayev , gdb-patches@sourceware.org Subject: Re: [PATCH][PR 18702] Fix wrong output of x87 registers due to truncation to double on amd64 References: <564F998D.5080406@gmail.com> In-Reply-To: <564F998D.5080406@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-SW-Source: 2015-12/txt/msg00043.txt.bz2 On 11/20/2015 10:07 PM, Ruslan Kabatsayev wrote: > When `info float` is used on an AMD64 system, GDB prints floating-point > values of x87 registers with raw contents like 0x361a867a8e0527397ce0 or > 0xc4f988454a1ddd3cfdab wrongly. This happens due to truncation to double, > after which the former becomes 0.0, and the latter becomes negative infinity. > This is caused by failed detection of x86-64 host, which results in setting > gdb_host_{float,double,long_double}_format to zeros. > This commit fixes this misdetection. A test to make sure we don't regress this would be nice. Maybe add something to gdb.arch/i386-float.exp ? Thanks, Pedro Alves