From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13314 invoked by alias); 18 Dec 2013 00:03:03 -0000 Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: glibc-bugs-owner@sourceware.org Received: (qmail 13230 invoked by uid 48); 18 Dec 2013 00:03:00 -0000 From: "jsm28 at gcc dot gnu.org" To: glibc-bugs@sourceware.org Subject: [Bug math/16338] New: ldbl-128 logl does not handle subnormals Date: Wed, 18 Dec 2013 00:03:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: glibc X-Bugzilla-Component: math X-Bugzilla-Version: 2.19 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: jsm28 at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-12/txt/msg00140.txt.bz2 https://sourceware.org/bugzilla/show_bug.cgi?id=16338 Bug ID: 16338 Summary: ldbl-128 logl does not handle subnormals Product: glibc Version: 2.19 Status: NEW Severity: normal Priority: P2 Component: math Assignee: unassigned at sourceware dot org Reporter: jsm28 at gcc dot gnu.org The ldbl-128 logl implementation treats subnormals as if their exponent is normal, resulting in large errors (e.g. logl (0x1p-16494L) is -0x1.62dea45ee3e064dbc66918126b26p+13 when it should be -0x1.6546282207802c89d24d65e96274p+13). I think this is in turn the cause of large lgammal errors in libm testing. -- You are receiving this mail because: You are on the CC list for the bug.