From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Mark H Weaver Newsgroups: gmane.lisp.guile.bugs Subject: bug#21901: bit shift wrong on maximal right shift Date: Sun, 14 Oct 2018 05:40:51 -0400 Message-ID: <87pnwcuaqk.fsf@netris.org> References: <20151113102203.GL13455@fysh.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1539510013 21568 195.159.176.226 (14 Oct 2018 09:40:13 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 14 Oct 2018 09:40:13 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) Cc: 21901-done@debbugs.gnu.org To: Zefram Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Sun Oct 14 11:40:09 2018 Return-path: Envelope-to: guile-bugs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gBcsW-0005St-9U for guile-bugs@m.gmane.org; Sun, 14 Oct 2018 11:40:04 +0200 Original-Received: from localhost ([::1]:47758 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gBcuc-0003NZ-LZ for guile-bugs@m.gmane.org; Sun, 14 Oct 2018 05:42:14 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35430) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gBcuU-0003MD-53 for bug-guile@gnu.org; Sun, 14 Oct 2018 05:42:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gBcuQ-00028H-W3 for bug-guile@gnu.org; Sun, 14 Oct 2018 05:42:06 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:44557) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gBcuQ-00027w-OX for bug-guile@gnu.org; Sun, 14 Oct 2018 05:42:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1gBcuQ-0007Gk-Jq for bug-guile@gnu.org; Sun, 14 Oct 2018 05:42:02 -0400 Resent-From: Mark H Weaver Original-Sender: "Debbugs-submit" Resent-To: bug-guile@gnu.org Resent-Date: Sun, 14 Oct 2018 09:42:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: cc-closed 21901 X-GNU-PR-Package: guile X-GNU-PR-Keywords: Mail-Followup-To: 21901@debbugs.gnu.org, mhw@netris.org, zefram@fysh.org Original-Received: via spool by 21901-done@debbugs.gnu.org id=D21901.153951007427881 (code D ref 21901); Sun, 14 Oct 2018 09:42:02 +0000 Original-Received: (at 21901-done) by debbugs.gnu.org; 14 Oct 2018 09:41:14 +0000 Original-Received: from localhost ([127.0.0.1]:48813 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gBcte-0007Fd-LF for submit@debbugs.gnu.org; Sun, 14 Oct 2018 05:41:14 -0400 Original-Received: from world.peace.net ([64.112.178.59]:42542) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gBctc-0007FQ-Ie for 21901-done@debbugs.gnu.org; Sun, 14 Oct 2018 05:41:12 -0400 Original-Received: from mhw by world.peace.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gBctW-0002Wp-Ig; Sun, 14 Oct 2018 05:41:06 -0400 In-Reply-To: <20151113102203.GL13455@fysh.org> (Zefram's message of "Fri, 13 Nov 2015 10:22:03 +0000") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-guile@gnu.org List-Id: "Bug reports for GUILE, GNU's Ubiquitous Extension Language" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Original-Sender: "bug-guile" Xref: news.gmane.org gmane.lisp.guile.bugs:9188 Archived-At: Zefram writes: > With Guile 2.0.11: > > scheme@(guile-user)> (ash 123 (ash -1 63)) > $1 = 123 > > Correct result would of course be zero. Problem only occurs for > exactly this shift distance: one bit less produces the right answer. Nice catch! It's finally fixed in commit 1990aa916382d0afcebd5315a6d6f555949ff654 on the stable-2.2 branch. The fix will be in Guile 2.2.5. Thanks for the report. Mark