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* [Bug math/6809] New: tgamma() sets errno inconsistently for domain error
@ 2008-07-31 13:35 mtk dot manpages at gmail dot com
2008-07-31 13:36 ` [Bug math/6809] " mtk dot manpages at gmail dot com
0 siblings, 1 reply; 4+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 13:35 UTC (permalink / raw)
To: glibc-bugs
The POSIX.1 specification of tgamma says:
==
The value of x is a negative integer, or x is -Inf.
If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then
errno shall be set to [EDOM]. If the integer expression (math_errhandling &
MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be
raised.
==
For both -ve integer and -Inf, GNU's tgamma() correctly raises an FE_INVALID
exception. However, errno is only correctly set (to EDOM) for the -ve integer
case. For -Inf, errno is not set; it shoul dbe set to EDOM.
Background:
On error, many glibc math functions both set errno and raise an exception
(fetestexcept(3)). For example, the following function all do this: acos(),
asin(), cosh(), sinh(), acosh(), asinh(), exp(), exp2(), ldexp(), log(),
log10(), log2(). However, there is much inconsistency. Some functions raise an
exception, but don't set errno. Some functions set errno for some errors, but
not others. A few set errno, but don't raise an exception. This series of bug
reports documents deviations from what I consider the ideal: all functions
should BOTH set errno AND raise an exception for all errors.
All of these reports relate to tests on glibc 2.8 (as provided by SUSE 11.0).
--
Summary: tgamma() sets errno inconsistently for domain error
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: aj at suse dot de
ReportedBy: mtk dot manpages at gmail dot com
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=6809
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* [Bug math/6809] tgamma() sets errno inconsistently for domain error
2008-07-31 13:35 [Bug math/6809] New: tgamma() sets errno inconsistently for domain error mtk dot manpages at gmail dot com
@ 2008-07-31 13:36 ` mtk dot manpages at gmail dot com
0 siblings, 0 replies; 4+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 13:36 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From mtk dot manpages at gmail dot com 2008-07-31 13:35 -------
Created an attachment (id=2881)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=2881&action=view)
test program
Test runs demonstrating the problem:
$ /tmp/mt_tgamma -- -1
errno == EDOM
fetestexcept() says: FE_INVALID
tgamma(-1.00000000000000000e+00)=nan
EDOM FE_INVALID nan
$ /tmp/mt_tgamma -- -inf
errno == 0
fetestexcept() says: FE_INVALID
tgamma(-inf)=nan
0 FE_INVALID nan
--
http://sourceware.org/bugzilla/show_bug.cgi?id=6809
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* [Bug math/6809] tgamma() sets errno inconsistently for domain error
[not found] <bug-6809-131@http.sourceware.org/bugzilla/>
2012-03-01 23:27 ` jsm28 at gcc dot gnu.org
@ 2013-05-10 11:36 ` jsm28 at gcc dot gnu.org
1 sibling, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-05-10 11:36 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=6809
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2013-05-10 11:35:59 UTC ---
Fixed for 2.18 by:
commit ab2b94613d85ba9edc659bd5e930b9ab1ec8e8a9
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri May 10 11:35:11 2013 +0000
Fix tgamma errno setting on domain error (bug 6809).
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* [Bug math/6809] tgamma() sets errno inconsistently for domain error
[not found] <bug-6809-131@http.sourceware.org/bugzilla/>
@ 2012-03-01 23:27 ` jsm28 at gcc dot gnu.org
2013-05-10 11:36 ` jsm28 at gcc dot gnu.org
1 sibling, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-03-01 23:27 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=6809
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|aj at suse dot de |unassigned at sourceware
| |dot org
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-03-01 23:27:08 UTC ---
Confirmed with current sources on both x86 and x86_64.
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2008-07-31 13:35 [Bug math/6809] New: tgamma() sets errno inconsistently for domain error mtk dot manpages at gmail dot com
2008-07-31 13:36 ` [Bug math/6809] " mtk dot manpages at gmail dot com
[not found] <bug-6809-131@http.sourceware.org/bugzilla/>
2012-03-01 23:27 ` jsm28 at gcc dot gnu.org
2013-05-10 11:36 ` jsm28 at gcc dot gnu.org
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