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From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug math/14283] New: Inaccurate range reduction for float (sinf, cosf)
Date: Fri, 22 Jun 2012 20:40:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14283

             Bug #: 14283
           Summary: Inaccurate range reduction for float (sinf, cosf)
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


On x86_64 and x86, sinf and cosf have large errors (tens of thousands of ulps)
on some inputs, arising from inaccurate range reduction.  Examples extracted
from a log mistakenly attached to bug 5997 and discussed in bug 1163 are sinf
(0x1.7f4134p+103) and cosf (0x1.442f74p+15).  I'll send a patch.

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