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* [Bug math/15394] New: Inaccurate imaginary part of catan result, real part of catanh result
@ 2013-04-24 15:37 jsm28 at gcc dot gnu.org
2013-04-24 18:50 ` [Bug math/15394] " jsm28 at gcc dot gnu.org
2014-06-13 18:17 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-04-24 15:37 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15394
Bug #: 15394
Summary: Inaccurate imaginary part of catan result, real part
of catanh result
Product: glibc
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
catan can produce results with inaccurate imaginary part from the use of log of
numbers very close to 1; likewise, catanh can produce results with inaccurate
real part. For example, on x86_64, catan (0x1p500i) produces imaginary part 0,
and catanh (0x1p500) produces real part 0, when the expected value is
3.0549...e-151 in each case.
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* [Bug math/15394] Inaccurate imaginary part of catan result, real part of catanh result
2013-04-24 15:37 [Bug math/15394] New: Inaccurate imaginary part of catan result, real part of catanh result jsm28 at gcc dot gnu.org
@ 2013-04-24 18:50 ` jsm28 at gcc dot gnu.org
2014-06-13 18:17 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-04-24 18:50 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15394
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> 2013-04-24 18:50:05 UTC ---
Fixed for 2.18 by:
commit 2f38fbfe09e4856c571bf0c80844e5dac9bc77ec
Author: Joseph Myers <joseph@codesourcery.com>
Date: Wed Apr 24 18:49:13 2013 +0000
Fix catan, catanh inaccuracy through use of log (bug 15394).
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* [Bug math/15394] Inaccurate imaginary part of catan result, real part of catanh result
2013-04-24 15:37 [Bug math/15394] New: Inaccurate imaginary part of catan result, real part of catanh result jsm28 at gcc dot gnu.org
2013-04-24 18:50 ` [Bug math/15394] " jsm28 at gcc dot gnu.org
@ 2014-06-13 18:17 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 18:17 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15394
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2013-04-24 15:37 [Bug math/15394] New: Inaccurate imaginary part of catan result, real part of catanh result jsm28 at gcc dot gnu.org
2013-04-24 18:50 ` [Bug math/15394] " jsm28 at gcc dot gnu.org
2014-06-13 18:17 ` fweimer at redhat dot com
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