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* [Bug math/15287] New: casinh inaccurate for imaginary part of argument = 1 and small real part
@ 2013-03-20 0:53 jsm28 at gcc dot gnu.org
2013-03-21 10:28 ` [Bug math/15287] " jsm28 at gcc dot gnu.org
2014-06-13 18:41 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-03-20 0:53 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15287
Bug #: 15287
Summary: casinh inaccurate for imaginary part of argument = 1
and small real part
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 implementation of casinh is substantially inaccurate for arguments with
imaginary part 1 (or -1) and small real part. For example, on x86_64, casinh
(0x1p-30 + 1.0i) should return 0x1.64564057723e9p-15 + 0x1.921cec97c2264p+0i
but returns 0x1.0000000155515p-15 + 0x1.921db54442d43p+0i, with both parts
substantially inaccurate. For subnormal arguments (e.g. 0x1.fp-1025), the
inaccurate results underflow where the correct results would not, with
associated underflow exceptions. Much the same issues affect casin and cacos
for appropriate inputs to those functions.
Patch: http://sourceware.org/ml/libc-alpha/2013-03/msg00465.html
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* [Bug math/15287] casinh inaccurate for imaginary part of argument = 1 and small real part
2013-03-20 0:53 [Bug math/15287] New: casinh inaccurate for imaginary part of argument = 1 and small real part jsm28 at gcc dot gnu.org
@ 2013-03-21 10:28 ` jsm28 at gcc dot gnu.org
2014-06-13 18:41 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-03-21 10:28 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15287
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> 2013-03-21 10:28:10 UTC ---
Fixed for 2.18 by:
commit 0a1b2ae6f6d511519ab3c0ccbf54982ae65bc444
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Mar 21 10:27:10 2013 +0000
Fix casinh inaccuracy for argument with imaginary part 1 (bug 15287).
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* [Bug math/15287] casinh inaccurate for imaginary part of argument = 1 and small real part
2013-03-20 0:53 [Bug math/15287] New: casinh inaccurate for imaginary part of argument = 1 and small real part jsm28 at gcc dot gnu.org
2013-03-21 10:28 ` [Bug math/15287] " jsm28 at gcc dot gnu.org
@ 2014-06-13 18:41 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 18:41 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15287
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2013-03-20 0:53 [Bug math/15287] New: casinh inaccurate for imaginary part of argument = 1 and small real part jsm28 at gcc dot gnu.org
2013-03-21 10:28 ` [Bug math/15287] " jsm28 at gcc dot gnu.org
2014-06-13 18:41 ` fweimer at redhat dot com
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