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* [Bug math/14784] New: Spurious underflows from fma when a * b is small
@ 2012-10-30 1:03 jsm28 at gcc dot gnu.org
2012-11-01 16:49 ` [Bug math/14784] " jsm28 at gcc dot gnu.org
2014-06-14 11:17 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-10-30 1:03 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14784
Bug #: 14784
Summary: Spurious underflows from fma when a * b is small
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
fma (a, b, c) gives spurious underflow exceptions in some cases when a * b is
sufficiently small that the implementation uses a * b + c for the computation,
but the final result does not underflow. Example, on x86: fmal (0x1p-16382L,
-0x1p-16382L, 0x1p16383L).
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* [Bug math/14784] Spurious underflows from fma when a * b is small
2012-10-30 1:03 [Bug math/14784] New: Spurious underflows from fma when a * b is small jsm28 at gcc dot gnu.org
@ 2012-11-01 16:49 ` jsm28 at gcc dot gnu.org
2014-06-14 11:17 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-11-01 16:49 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14784
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> 2012-11-01 16:48:53 UTC ---
Fixed by:
commit 473611b22d630a5cbb870d2a7edf08071d4d8ace
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Nov 1 16:47:26 2012 +0000
Fix fma (a, b, c) for small a * b (bugs 14784, 14785).
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* [Bug math/14784] Spurious underflows from fma when a * b is small
2012-10-30 1:03 [Bug math/14784] New: Spurious underflows from fma when a * b is small jsm28 at gcc dot gnu.org
2012-11-01 16:49 ` [Bug math/14784] " jsm28 at gcc dot gnu.org
@ 2014-06-14 11:17 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-14 11:17 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14784
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2012-10-30 1:03 [Bug math/14784] New: Spurious underflows from fma when a * b is small jsm28 at gcc dot gnu.org
2012-11-01 16:49 ` [Bug math/14784] " jsm28 at gcc dot gnu.org
2014-06-14 11:17 ` fweimer at redhat dot com
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