From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <glibc-bugs-return-28710-listarch-glibc-bugs=sources.redhat.com@sourceware.org>
Received: (qmail 30915 invoked by alias); 29 Jun 2015 21:06:39 -0000
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
Received: (qmail 30880 invoked by uid 48); 29 Jun 2015 21:06:35 -0000
From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/18613] New: tgamma inaccurate in non-default rounding modes
Date: Mon, 29 Jun 2015 21:06:00 -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: 2.21
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jsm28 at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution:
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 target_milestone
Message-ID: <bug-18613-131@http.sourceware.org/bugzilla/>
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: 2015-06/txt/msg00321.txt.bz2

https://sourceware.org/bugzilla/show_bug.cgi?id=18613

            Bug ID: 18613
           Summary: tgamma inaccurate in non-default rounding modes
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

In non-default rounding modes, tgamma can be slightly less accurate than
permitted by glibc's accuracy goals, e.g. for double on x86_64:

Failure: Test: tgamma_towardzero (-0x6.fe4638p+0)
Result:
 is:         -2.98383122695617016006e-02  -0x1.e8def3d7660a50000000p-6
 should be:  -2.98383122695616634367e-02  -0x1.e8def3d76609a0000000p-6
 difference:  3.81639164714897560770e-17   0x1.60000000000000000000p-55
 ulp       :  11.0000
 max.ulp   :  0.0000

-- 
You are receiving this mail because:
You are on the CC list for the bug.