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* [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
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