Newsgroups: php.internals Path: news.php.net Xref: news.php.net php.internals:65757 Return-Path: Mailing-List: contact internals-help@lists.php.net; run by ezmlm Delivered-To: mailing list internals@lists.php.net Received: (qmail 59378 invoked from network); 10 Feb 2013 15:19:57 -0000 Received: from unknown (HELO lists.php.net) (127.0.0.1) by localhost with SMTP; 10 Feb 2013 15:19:57 -0000 Authentication-Results: pb1.pair.com header.from=remi@fedoraproject.org; sender-id=unknown Authentication-Results: pb1.pair.com smtp.mail=remi@fedoraproject.org; spf=permerror; sender-id=unknown Received-SPF: error (pb1.pair.com: domain fedoraproject.org from 212.27.42.5 cause and error) X-PHP-List-Original-Sender: remi@fedoraproject.org X-Host-Fingerprint: 212.27.42.5 smtp5-g21.free.fr Linux 2.6 Received: from [212.27.42.5] ([212.27.42.5:56036] helo=smtp5-g21.free.fr) by pb1.pair.com (ecelerity 2.1.1.9-wez r(12769M)) with ESMTP id 62/E6-20900-A9AB7115 for ; Sun, 10 Feb 2013 10:19:56 -0500 Received: from dixsept.famillecollet.com (unknown [82.241.130.121]) by smtp5-g21.free.fr (Postfix) with ESMTP id 67A94D481B9 for ; Sun, 10 Feb 2013 16:19:47 +0100 (CET) Message-ID: <5117BA92.8080307@fedoraproject.org> Date: Sun, 10 Feb 2013 16:19:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: PHP Internals References: <511666DE.8080809@fedoraproject.org> <51172819.4000806@sugarcrm.com> <51174790.8040805@fedoraproject.org> <511751C5.1020906@fedoraproject.org> <51175BDD.9040705@sugarcrm.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: Re: [PHP-DEV] double val to long val conversion issue From: remi@fedoraproject.org (Remi Collet) Le 10/02/2013 15:58, Gustavo Lopes a écrit : > If we want to eliminate the undefined behavior, we should do (on archs > with 64-bit longs): > > (long)(unsigned long)(fmod(d, pow(2., 64.))) > > Can you test this program on ppc64: $ gcc -O3 -lm conv.c && ./a.out 9223372036854775808 -9223372036854775808 -9223372036854775808 $ gcc -O3 -lm conv.c && ./a.out 4e21 -2943463994972700672 -1 $ gcc -O3 -lm conv.c && ./a.out 4e19 3106511852580896768 -1 > I get this: > $ gcc -O3 -lm conv.c && ./a.out 9223372036854775808 > -9223372036854775808 -9223372036854775808 > $ gcc -O3 -lm conv.c && ./a.out 4e21 > -2943463994972700672 0 > $ gcc -O3 -lm conv.c && ./a.out 4e19 > 3106511852580896768 0 Remi.