From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Ken Brown Newsgroups: gmane.emacs.bugs Subject: bug#18438: 24.4.50; assertion failed in bidi.c Date: Fri, 10 Oct 2014 13:14:02 -0400 Message-ID: <543813DA.9060505@cornell.edu> References: <4745242cd3e424a6c4d5db0e8d3e33d0@amuri.net> <83h9zrlzc8.fsf@gnu.org> <54297FDB.6090606@cornell.edu> <837g0mmkf3.fsf@gnu.org> <6b19fab333f3d362ae61b30b299d7206@amuri.net> <83iok5ku74.fsf@gnu.org> <88ccbe34bf58322ae4b2a5657390c041@amuri.net> <83ppe1itu9.fsf@gnu.org> <837g08bdcy.fsf@gnu.org> <5437E50A.20108@cornell.edu> <83tx3c9cwf.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1412961327 11350 80.91.229.3 (10 Oct 2014 17:15:27 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 10 Oct 2014 17:15:27 +0000 (UTC) Cc: 18438@debbugs.gnu.org, aidalgol@amuri.net To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Oct 10 19:15:20 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xcdmh-0006NB-9d for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Oct 2014 19:15:19 +0200 Original-Received: from localhost ([::1]:50017 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xcdmg-0003FZ-Oa for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Oct 2014 13:15:18 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:51550) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XcdmX-0003Di-HG for bug-gnu-emacs@gnu.org; Fri, 10 Oct 2014 13:15:15 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XcdmR-0006Qc-9h for bug-gnu-emacs@gnu.org; Fri, 10 Oct 2014 13:15:09 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:48748) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XcdmR-0006QM-7a for bug-gnu-emacs@gnu.org; Fri, 10 Oct 2014 13:15:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1XcdmQ-0000EG-RS for bug-gnu-emacs@gnu.org; Fri, 10 Oct 2014 13:15:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Ken Brown Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 10 Oct 2014 17:15:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18438 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: moreinfo Original-Received: via spool by 18438-submit@debbugs.gnu.org id=B18438.1412961260809 (code B ref 18438); Fri, 10 Oct 2014 17:15:02 +0000 Original-Received: (at 18438) by debbugs.gnu.org; 10 Oct 2014 17:14:20 +0000 Original-Received: from localhost ([127.0.0.1]:40312 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1Xcdlj-0000Cz-B9 for submit@debbugs.gnu.org; Fri, 10 Oct 2014 13:14:19 -0400 Original-Received: from limerock04.mail.cornell.edu ([128.84.13.244]:49858) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1Xcdli-0000Cq-42 for 18438@debbugs.gnu.org; Fri, 10 Oct 2014 13:14:18 -0400 X-CornellRouted: This message has been Routed already. Original-Received: from authusersmtp.mail.cornell.edu (granite4.serverfarm.cornell.edu [10.16.197.9]) by limerock04.mail.cornell.edu (8.14.4/8.14.4_cu) with ESMTP id s9AHE5jB014241; Fri, 10 Oct 2014 13:14:05 -0400 Original-Received: from [192.168.1.4] (cpe-67-249-176-226.twcny.res.rr.com [67.249.176.226]) (authenticated bits=0) by authusersmtp.mail.cornell.edu (8.14.4/8.12.10) with ESMTP id s9AHE3Eh028371 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Fri, 10 Oct 2014 13:14:04 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 In-Reply-To: <83tx3c9cwf.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:94392 On 10/10/2014 11:12 AM, Eli Zaretskii wrote: > Thanks. Although I have a question to x86_64 experts here: > >> 0x00000001004fc42b <+8>: mov %ecx,0x10(%rbp) >> 0x00000001004fc42e <+11>: mov 0x10(%rbp),%eax >> 0x00000001004fc431 <+14>: mov %rax,-0x8(%rbp) > > Do these 3 instructions ensure that the MSB 32 bits of RAX (and > therefore the place where the result is stored at RBP+0x08) are zeroed > out? According to this, the answer is yes: http://stackoverflow.com/questions/11177137/why-do-most-x64-instructions-zero-the-upper-part-of-a-32-bit-register Ken