X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:message-id:date:from:mime-version:to:subject :references:in-reply-to:content-type:content-transfer-encoding; q=dns; s=default; b=ZHtMHb4XhW4ef8Lp04zyM7WlKcjKIdRoomk7AtQOxRf 8whpqQn8hNVGGkuP+ui00CvIRj3mnaBrDRRMbfcCs0CcE6aJeFpDRjyzljzN6mKW e+4qbpQVof2XBFAY4ETZEdfQLeVr6z2EEYz4b7i5l922537XrD0hKqY4rNN+RhDY = DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:message-id:date:from:mime-version:to:subject :references:in-reply-to:content-type:content-transfer-encoding; s=default; bh=FwCX8Ce8eoQtsRzpmsBTuiOFE2o=; b=FHzEZMBx/c9QyHaKx WWeAAsJ2gtTDM7IloYAb2HNL9nUWnmGOrw51qgxxBp82P4CDsSXakO6L+1LDSTuZ 07/ceAAR+izB4YboZ1wcGVilbNvFCygBBvGCM9Rfnhm7hmlzhCVG6TQq5EFLMoe6 SQCB7ssENPiye5cDasN5+G/HE4= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=1.3 required=5.0 tests=AWL,BAYES_50,FREEMAIL_FROM,KAM_MXURI,RCVD_IN_DNSWL_NONE,RP_MATCHES_RCVD,SPF_PASS autolearn=no version=3.3.2 X-HELO: omr-d03.mx.aol.com Message-ID: <53E3C0FA.9000703@aol.com> Date: Thu, 07 Aug 2014 14:10:02 -0400 From: Tim Prince User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: suggestion about math.h References: <8437F00B-0E62-4F8A-9B4C-B7425545289F AT Denis-Excoffier DOT org> In-Reply-To: <8437F00B-0E62-4F8A-9B4C-B7425545289F@Denis-Excoffier.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit x-aol-global-disposition: G x-aol-sid: 3039ac1d1bcd53e3c0fd7a46 X-AOL-IP: 65.26.156.163 On 8/7/2014 1:41 PM, Denis Excoffier wrote: > Hello, > > Perhaps the values of some constants are not as accurate as they should be? See also M_LN2LO and M_LN2HI. > > diff -uNr cygwin-snapshot-20140807-1-original/newlib/libc/include/math.h cygwin-snapshot-20140807-1-patched/newlib/libc/include/math.h > --- cygwin-snapshot-20140807-1-original/newlib/libc/include/math.h 2014-08-07 18:26:21.000000000 +0200 > +++ cygwin-snapshot-20140807-1-patched/newlib/libc/include/math.h 2014-08-07 19:31:51.000000000 +0200 > @@ -569,14 +569,14 @@ > #ifndef __STRICT_ANSI__ > > #define M_TWOPI (M_PI * 2.0) > -#define M_3PI_4 2.3561944901923448370E0 > -#define M_SQRTPI 1.77245385090551602792981 > +#define M_3PI_4 2.3561944901923449288E0 > +#define M_SQRTPI 1.77245385090551602729817 > #define M_LN2LO 1.9082149292705877000E-10 > #define M_LN2HI 6.9314718036912381649E-1 > -#define M_SQRT3 1.73205080756887719000 > +#define M_SQRT3 1.73205080756887729353 > #define M_IVLN10 0.43429448190325182765 /* 1 / log(10) */ > #define M_LOG2_E _M_LN2 > -#define M_INVLN2 1.4426950408889633870E0 /* 1 / log(2) */ > +#define M_INVLN2 1.4426950408889634074E0 /* 1 / log(2) */ > > /* Global control over fdlibm error handling. */ > > > > Without the L suffix, it doesn't look like it matters. I just noticed this week the M_LN2LO and HI. They should add up to a long double accurate constant. I've been using a similar pair in implementation of exp() for 20 years. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple