public inbox for glibc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug math/14811] New: Spurious underflows from pow results very close to 1
@ 2012-11-06 16:52 jsm28 at gcc dot gnu.org
2012-11-07 13:04 ` [Bug math/14811] " jsm28 at gcc dot gnu.org
2014-06-14 11:13 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-11-06 16:52 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14811
Bug #: 14811
Summary: Spurious underflows from pow results very close to 1
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
Various pow implementations have internal underflows in the internal
computation of y * log (x) when that is very small. For example, the following
all raise spurious underflow exceptions on x86_64 (and return the correct
answer 1): powf (1.01f, 0x1p-149f), pow (1.01, 0x1p-1074), powl (1.01L,
0x1p-16445L).
--
Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug math/14811] Spurious underflows from pow results very close to 1
2012-11-06 16:52 [Bug math/14811] New: Spurious underflows from pow results very close to 1 jsm28 at gcc dot gnu.org
@ 2012-11-07 13:04 ` jsm28 at gcc dot gnu.org
2014-06-14 11:13 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-11-07 13:04 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14811
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> 2012-11-07 13:04:32 UTC ---
Fixed for 2.17 by:
commit 60e235ee2ae834bb9f7a884f1b192304b9fdcf33
Author: Joseph Myers <joseph@codesourcery.com>
Date: Wed Nov 7 13:03:31 2012 +0000
Fix spurious underflows from pow with results close to 1 (bug 14811).
--
Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug math/14811] Spurious underflows from pow results very close to 1
2012-11-06 16:52 [Bug math/14811] New: Spurious underflows from pow results very close to 1 jsm28 at gcc dot gnu.org
2012-11-07 13:04 ` [Bug math/14811] " jsm28 at gcc dot gnu.org
@ 2014-06-14 11:13 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-14 11:13 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14811
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
--
You are receiving this mail because:
You are on the CC list for the bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-06-14 11:13 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-11-06 16:52 [Bug math/14811] New: Spurious underflows from pow results very close to 1 jsm28 at gcc dot gnu.org
2012-11-07 13:04 ` [Bug math/14811] " jsm28 at gcc dot gnu.org
2014-06-14 11:13 ` fweimer at redhat dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).