From unknown Fri Sep 05 09:10:44 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#14864 <14864@debbugs.gnu.org> To: bug#14864 <14864@debbugs.gnu.org> Subject: Status: bitwise-arithmetic-shift-right is wrong for large shift amounts Reply-To: bug#14864 <14864@debbugs.gnu.org> Date: Fri, 05 Sep 2025 16:10:44 +0000 retitle 14864 bitwise-arithmetic-shift-right is wrong for large shift amoun= ts reassign 14864 guile submitter 14864 G=C3=B6ran Weinholt severity 14864 normal thanks From debbugs-submit-bounces@debbugs.gnu.org Sun Jul 14 12:14:19 2013 Received: (at submit) by debbugs.gnu.org; 14 Jul 2013 16:14:19 +0000 Received: from localhost ([127.0.0.1]:54094 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1UyOwE-0007BB-V9 for submit@debbugs.gnu.org; Sun, 14 Jul 2013 12:14:19 -0400 Received: from eggs.gnu.org ([208.118.235.92]:55123) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1UyOwC-0007Af-K7 for submit@debbugs.gnu.org; Sun, 14 Jul 2013 12:14:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UyOw6-0006TB-Cy for submit@debbugs.gnu.org; Sun, 14 Jul 2013 12:14:11 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-99.2 required=5.0 tests=BAYES_50,T_DKIM_INVALID, USER_IN_WHITELIST autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:56788) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UyOw6-0006T7-AR for submit@debbugs.gnu.org; Sun, 14 Jul 2013 12:14:10 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56841) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UyOw5-0006ee-Cx for bug-guile@gnu.org; Sun, 14 Jul 2013 12:14:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UyOw4-0006Su-Ck for bug-guile@gnu.org; Sun, 14 Jul 2013 12:14:09 -0400 Received: from iustitia.weinholt.se ([2a02:28f0:0:a::7dce:e5a8]:36496) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UyOw4-0006Sl-0m for bug-guile@gnu.org; Sun, 14 Jul 2013 12:14:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=weinholt.se; s=iustitia2012; h=Content-Type:MIME-Version:Message-ID:Date:Subject:To:From; bh=kzPX8ifyIvmJS93g/Gi7F4CRB+1iRBScqiuldej9MEM=; b=laXnN+D3C7TllouSdZTcoft67F4NSySjJnYIgkB8a4lNj/zyaIik7PGKNLGxA6sDPsP649WQHUFdT3wOYe/bUDiyAYQmSUgAPPTugabDDfqYSZskeevddX4DnpvKlDhOBZbt12/rNUczVZmiHBXLo1RuiNZLcvyr/i8E3AgjES9vhhA9PqoC4Iu2eVOlndmOIFfC2zTIvW3MjLCsrKxMqBHAtLJWKK94CQpveGOArrVt+KJwDpGuiBCxInBu7drW3UKGDb3GjM/RAocnTRoyliz2GiqXsknxHvK3JtwxoSTdWcx7yXs96ap2SelFDalYVx8WnNfqsq3OE0WuAfr3tA==; Received: from uucp by iustitia.weinholt.se with local-bsmtp (Exim 4.72) (envelope-from ) id 1UyOw2-0006Pe-Li; Sun, 14 Jul 2013 18:14:06 +0200 Received: from weinholt by industria with local (Exim 4.80) (envelope-from ) id 1UyOr2-00056P-7p; Sun, 14 Jul 2013 18:08:56 +0200 X-Hashcash: 1:20:130714:bug-guile@gnu.org::PGDspBnhoqf+sq8s:000000000000000000000000000000000000000000004wSM From: =?utf-8?Q?G=C3=B6ran?= Weinholt To: bug-guile@gnu.org Subject: bitwise-arithmetic-shift-right is wrong for large shift amounts Date: Sun, 14 Jul 2013 18:08:55 +0200 Message-ID: <87a9lpdsyw.fsf@industria.weinholt.se> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (gnu/linux) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hello schemers, bitwise-arithmetic-shift-right from (rnrs) is wrong for ridiculously large shift amounts: scheme@(guile-user)> (import (rnrs)) scheme@(guile-user)> (bitwise-arithmetic-shift-right -2 (+ (greatest-fixnum= ) 1)) $1 =3D -2 The correct result is -1. Tested on an amd64 system with guile-2.0.9.20-10454-dirty. Here are a few more failing cases, if it helps: (bitwise-arithmetic-shift-right -1939573486025768832 1842615318141600354) =3D> =2D112898036 ; *** failed *** ; expected result: -1 (bitwise-arithmetic-shift-right 1344211617424411880 1877595747324902264) =3D> 18 ; *** failed *** ; expected result: 0 (bitwise-arithmetic-shift-right -1152921504606846979 88553614889043251) =3D> =2D513 ; *** failed *** ; expected result: -1 (bitwise-arithmetic-shift-right -870600743868926059 1508151148) =3D> =2D49488 ; *** failed *** ; expected result: -1 Regards, =2D-=20 G=C3=B6ran Weinholt 13 MR. JAKES: I think our economy was based on 14 industrial process. 15 JUSTICE SCALIA: It was based on horses, for 16 Pete's sake. --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBCgAGBQJR4s0XAAoJEOM+YaLpuMOi9OwP/ApHe0ZvvWYaUWh9Ay3TFoo9 iGMgI8NCcbhqeSUYsDwGdf9PAPr8zzmJEHud7a7ghHgtmGcAOKxYNF2LkzplE+pG ICybtZxkyHvo6Ta71QguUrGR9Ezk7idsdmWvhjMmN0Xz1C9Y5+qdflNcP1uoP8Jq ywfX8VnvLIzjiWgpvfyi+rZnYSDiKgFZOF/RiFSJMppxy5M61rTtSe1gSfZjRq4v FNWZ/zZacXbCWV6/DbTgAgm5olDGlnA4hRBXQJm4l9QTykJxGFmrmRYsNyOmS8ZV kl+WJPP9YE4LehHFtianbinU7eZaRv6ZZMmyqGi41F543i5K9z2vhHAk035b8wj2 BPNehxcMh+EHTMV3sSxh1dVK9Rsyy6YE5em14YeDvUP2BoRlRLFc/e30BuZgUOCM tQ+FQy7m9QjAOqRGf/flmxVxEEqsryx30IKMmlWSHEho+NmPKxRKglhaxNwGA4NB pjqy86r5QZ84wCZ6+SHg+RF036N274xG+q7OX6aQu8GlaWZis+HuXiv9EYv+gebv bg3I/zUOB75PlBgpKkKufRs1/JMH2dVd3y7Yn7hXJs4ysthes2EAvm3ggc+Lwlm9 42xMigY23r0tba2Al7VLhCZ6lHqKTwFWrPxSzmac4u2tCq8wAwP+i1ImYdhgkJqW ZwTuNneINJeQN8WtyipU =4Q6R -----END PGP SIGNATURE----- --=-=-=-- From debbugs-submit-bounces@debbugs.gnu.org Sun Jul 14 14:54:56 2013 Received: (at 14864-done) by debbugs.gnu.org; 14 Jul 2013 18:54:56 +0000 Received: from localhost ([127.0.0.1]:54257 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1UyRRe-0005bR-Ow for submit@debbugs.gnu.org; Sun, 14 Jul 2013 14:54:55 -0400 Received: from world.peace.net ([96.39.62.75]:51587 ident=hope0) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1UyRRY-0005b9-Kn for 14864-done@debbugs.gnu.org; Sun, 14 Jul 2013 14:54:49 -0400 Received: from 209-6-120-240.c3-0.arl-ubr1.sbo-arl.ma.cable.rcn.com ([209.6.120.240] helo=tines.lan) by world.peace.net with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.72) (envelope-from ) id 1UyRRS-0003uW-6S; Sun, 14 Jul 2013 14:54:42 -0400 From: Mark H Weaver To: =?utf-8?Q?G=C3=B6ran?= Weinholt Subject: Re: bug#14864: bitwise-arithmetic-shift-right is wrong for large shift amounts References: <87a9lpdsyw.fsf@industria.weinholt.se> Date: Sun, 14 Jul 2013 14:54:24 -0400 In-Reply-To: <87a9lpdsyw.fsf@industria.weinholt.se> (=?utf-8?Q?=22G=C3=B6r?= =?utf-8?Q?an?= Weinholt"'s message of "Sun, 14 Jul 2013 18:08:55 +0200") Message-ID: <87hafx55wf.fsf@tines.lan> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 14864-done Cc: 14864-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) G=C3=B6ran Weinholt writes: > bitwise-arithmetic-shift-right from (rnrs) is wrong for ridiculously > large shift amounts: > > scheme@(guile-user)> (import (rnrs)) > scheme@(guile-user)> (bitwise-arithmetic-shift-right -2 (+ (greatest-fixn= um) 1)) > $1 =3D -2 > > The correct result is -1. Thanks for the report. Now fixed in stable-2.0. http://git.savannah.gnu.org/gitweb/?p=3Dguile.git;a=3Dcommitdiff;h=3D7e8166= f5bdb526c021c826943aaf050134cccc83 Mark From unknown Fri Sep 05 09:10:44 2025 Received: (at fakecontrol) by fakecontrolmessage; To: internal_control@debbugs.gnu.org From: Debbugs Internal Request Subject: Internal Control Message-Id: bug archived. Date: Mon, 12 Aug 2013 11:24:03 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator