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* [Bug math/15426] New: Wrong sign of infinity from tgamma overflow
@ 2013-05-01 22:18 jsm28 at gcc dot gnu.org
2013-05-08 12:01 ` [Bug math/15426] " jsm28 at gcc dot gnu.org
2014-06-13 18:09 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-05-01 22:18 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15426
Bug #: 15426
Summary: Wrong sign of infinity from tgamma overflow
Product: glibc
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
When tgamma of a negative argument very close to 0 overflows (the result is
essentially 1/x), it should produce negative infinity but wrongly produces
positive infinity. Example on x86_64: tgamma (-0x1p-1074).
(Discovered while working on a fix for the various known bugs about large ulps
from tgamma.)
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* [Bug math/15426] Wrong sign of infinity from tgamma overflow
2013-05-01 22:18 [Bug math/15426] New: Wrong sign of infinity from tgamma overflow jsm28 at gcc dot gnu.org
@ 2013-05-08 12:01 ` jsm28 at gcc dot gnu.org
2014-06-13 18:09 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-05-08 12:01 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15426
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> 2013-05-08 12:00:35 UTC ---
Fixed for 2.18 by:
commit d8cd06db62d92f86cc8cc3c0d6a489bd207bb834
Author: Joseph Myers <joseph@codesourcery.com>
Date: Wed May 8 11:58:18 2013 +0000
Improve tgamma accuracy (bugs 2546, 2560, 5159, 15426).
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* [Bug math/15426] Wrong sign of infinity from tgamma overflow
2013-05-01 22:18 [Bug math/15426] New: Wrong sign of infinity from tgamma overflow jsm28 at gcc dot gnu.org
2013-05-08 12:01 ` [Bug math/15426] " jsm28 at gcc dot gnu.org
@ 2014-06-13 18:09 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 18:09 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15426
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2013-05-01 22:18 [Bug math/15426] New: Wrong sign of infinity from tgamma overflow jsm28 at gcc dot gnu.org
2013-05-08 12:01 ` [Bug math/15426] " jsm28 at gcc dot gnu.org
2014-06-13 18:09 ` fweimer at redhat dot com
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