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* [Bug math/15023] New: cacos inaccurate for real part of result near
@ 2013-01-16 23:04 jsm28 at gcc dot gnu.org
2013-01-17 20:28 ` [Bug math/15023] cacos inaccurate for real part of result near 0 jsm28 at gcc dot gnu.org
2014-06-13 19:01 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-01-16 23:04 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15023
Bug #: 15023
Summary: cacos inaccurate for real part of result near 0
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
cacos is implemented as pi/2 - casin. This leads to inaccurate results through
cancellation when the real part of the result of casin is near pi/2, so the
real part of the result of cacos is near 0. For example, cacos (0x1p500 +
1.0i) gives a result with real part 0 (should be
3.054936363499604682051979393213617699789e-151).
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* [Bug math/15023] cacos inaccurate for real part of result near 0
2013-01-16 23:04 [Bug math/15023] New: cacos inaccurate for real part of result near jsm28 at gcc dot gnu.org
@ 2013-01-17 20:28 ` jsm28 at gcc dot gnu.org
2014-06-13 19:01 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-01-17 20:28 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15023
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> 2013-01-17 20:27:36 UTC ---
Fixed for 2.18 by:
commit 728d7b43fc8a4f9b3ec772fd8b75a39b945e9f04
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Jan 17 20:25:51 2013 +0000
Fix cacos real-part inaccuracy for result real part near 0 (bug 15023).
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* [Bug math/15023] cacos inaccurate for real part of result near 0
2013-01-16 23:04 [Bug math/15023] New: cacos inaccurate for real part of result near jsm28 at gcc dot gnu.org
2013-01-17 20:28 ` [Bug math/15023] cacos inaccurate for real part of result near 0 jsm28 at gcc dot gnu.org
@ 2014-06-13 19:01 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 19:01 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15023
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2013-01-16 23:04 [Bug math/15023] New: cacos inaccurate for real part of result near jsm28 at gcc dot gnu.org
2013-01-17 20:28 ` [Bug math/15023] cacos inaccurate for real part of result near 0 jsm28 at gcc dot gnu.org
2014-06-13 19:01 ` fweimer at redhat dot com
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