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* [Bug math/13885] New: expm1l inaccurate for x86_64/x86
@ 2012-03-20 23:45 jsm28 at gcc dot gnu.org
2012-05-07 19:21 ` [Bug math/13885] " jsm28 at gcc dot gnu.org
2014-06-26 13:47 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-03-20 23:45 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13885
Bug #: 13885
Summary: expm1l inaccurate for x86_64/x86
Product: glibc
Version: 2.15
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
The x86 and x86_64 implementations of expm1l, for exponents below 128, involve
a value of log2 (e) to long double precision, when a more accurate value (as in
expl) is needed. For example, this results in a 75ulp error for expm1l (127)
on x86_64.
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* [Bug math/13885] expm1l inaccurate for x86_64/x86
2012-03-20 23:45 [Bug math/13885] New: expm1l inaccurate for x86_64/x86 jsm28 at gcc dot gnu.org
@ 2012-05-07 19:21 ` jsm28 at gcc dot gnu.org
2014-06-26 13:47 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-05-07 19:21 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13885
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> 2012-05-07 19:21:15 UTC ---
Fixed by:
commit 495fd99f3a119e5c0c542ccc6cf9c93b1fb9e892
Author: Joseph Myers <joseph@codesourcery.com>
Date: Mon May 7 19:13:08 2012 +0000
Fix x86/x86_64 expm1l inaccuracy and exceptions (bugs 13885, 13923).
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* [Bug math/13885] expm1l inaccurate for x86_64/x86
2012-03-20 23:45 [Bug math/13885] New: expm1l inaccurate for x86_64/x86 jsm28 at gcc dot gnu.org
2012-05-07 19:21 ` [Bug math/13885] " jsm28 at gcc dot gnu.org
@ 2014-06-26 13:47 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-26 13:47 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=13885
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2012-03-20 23:45 [Bug math/13885] New: expm1l inaccurate for x86_64/x86 jsm28 at gcc dot gnu.org
2012-05-07 19:21 ` [Bug math/13885] " jsm28 at gcc dot gnu.org
2014-06-26 13:47 ` fweimer at redhat dot com
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