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[Bug math/14283] New: Inaccurate range reduction for float (sinf, cosf)
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Fri, 22 Jun 2012 20:40:35 +0000
- Subject: [Bug math/14283] New: Inaccurate range reduction for float (sinf, cosf)
- Auto-submitted: auto-generated
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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