From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <glibc-bugs-return-13789-listarch-glibc-bugs=sources.redhat.com@sourceware.org>
Received: (qmail 20259 invoked by alias); 23 Dec 2011 11:42:53 -0000
Received: (qmail 20242 invoked by uid 22791); 23 Dec 2011 11:42:52 -0000
X-SWARE-Spam-Status: No, hits=-2.8 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO sourceware.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 23 Dec 2011 11:42:41 +0000
From: "vincent-srcware at vinc17 dot net" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug math/13381] rounding problem wih sincosl
Date: Fri, 23 Dec 2011 11:42:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: math
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: vincent-srcware at vinc17 dot net
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: aj at suse dot de
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-13381-131-INbOBGDXu8@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-13381-131@http.sourceware.org/bugzilla/>
References: <bug-13381-131@http.sourceware.org/bugzilla/>
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <glibc-bugs.sourceware.org>
List-Subscribe: <mailto:glibc-bugs-subscribe@sourceware.org>
List-Post: <mailto:glibc-bugs@sourceware.org>
List-Help: <mailto:glibc-bugs-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: glibc-bugs-owner@sourceware.org
X-SW-Source: 2011-12/txt/msg00132.txt.bz2

http://sourceware.org/bugzilla/show_bug.cgi?id=3D13381

--- Comment #12 from Vincent Lef=C3=A8vre <vincent-srcware at vinc17 dot ne=
t> 2011-12-23 11:41:46 UTC ---
(In reply to comment #11)
> The documentation does not mention that the algorithm is different and th=
at
> sincosl could return a different result that cosl and sinl.

It doesn't have to. The C standard doesn't even require that the following
program always return true on finite values of c (i.e. x and y can be
different).

int test (double c)
{
  double x, y;
  x =3D sin(c);
  y =3D sin(c);
  return x =3D=3D y;
}

See my SIESTE slides to see how one can easily affect the result returned by
sin().

--=20
Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=3Demail
------- You are receiving this mail because: -------
You are on the CC list for the bug.