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* [Bug math/15062] New: casinh spurious underflows (away from [-i,i])
@ 2013-01-24 17:35 jsm28 at gcc dot gnu.org
2013-01-24 17:36 ` [Bug math/15062] " jsm28 at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-01-24 17:35 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15062
Bug #: 15062
Summary: casinh spurious underflows (away from [-i,i])
Product: glibc
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
The computation of casinh using log(z + sqrt(1 + z*z)) suffers from spurious
underflows when the complex sqrt underflows even though neither the real nor
the imaginary part of the final result would underflow. The same similarly
applies to casin and cacos, implemented in terms of casinh. Working on a
patch.
This bug is specifically about such underflows away from the line from -i to i
(where the real part of the result is 0); there are probably also such
underflows close to that line, but they will need fixing separately along with
the general issues of inaccuracy close to that line (bug 10357).
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* [Bug math/15062] casinh spurious underflows (away from [-i,i])
2013-01-24 17:35 [Bug math/15062] New: casinh spurious underflows (away from [-i,i]) jsm28 at gcc dot gnu.org
@ 2013-01-24 17:36 ` jsm28 at gcc dot gnu.org
2013-01-31 23:04 ` jsm28 at gcc dot gnu.org
2014-06-13 18:58 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-01-24 17:36 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15062
--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> 2013-01-24 17:35:45 UTC ---
Example of such a spurious underflow exception on x86_64: casinh (0x1.fp-1025 +
1.5i).
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* [Bug math/15062] casinh spurious underflows (away from [-i,i])
2013-01-24 17:35 [Bug math/15062] New: casinh spurious underflows (away from [-i,i]) jsm28 at gcc dot gnu.org
2013-01-24 17:36 ` [Bug math/15062] " jsm28 at gcc dot gnu.org
@ 2013-01-31 23:04 ` jsm28 at gcc dot gnu.org
2014-06-13 18:58 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-01-31 23:04 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15062
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> 2013-01-31 23:04:12 UTC ---
Fixed for 2.18 by:
commit 8cf28c5ebe7b02e769a3f3082fd390e6d8c11542
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Jan 31 22:55:29 2013 +0000
Fix casinh spurious underflows away from [-i,i] (bug 15062).
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* [Bug math/15062] casinh spurious underflows (away from [-i,i])
2013-01-24 17:35 [Bug math/15062] New: casinh spurious underflows (away from [-i,i]) jsm28 at gcc dot gnu.org
2013-01-24 17:36 ` [Bug math/15062] " jsm28 at gcc dot gnu.org
2013-01-31 23:04 ` jsm28 at gcc dot gnu.org
@ 2014-06-13 18:58 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 18:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15062
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2013-01-24 17:35 [Bug math/15062] New: casinh spurious underflows (away from [-i,i]) jsm28 at gcc dot gnu.org
2013-01-24 17:36 ` [Bug math/15062] " jsm28 at gcc dot gnu.org
2013-01-31 23:04 ` jsm28 at gcc dot gnu.org
2014-06-13 18:58 ` fweimer at redhat dot com
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