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* [Bug math/6792] New: log1p() does not set errno n error
@ 2008-07-31 9:23 mtk dot manpages at gmail dot com
2008-07-31 9:27 ` [Bug math/6792] " mtk dot manpages at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 9:23 UTC (permalink / raw)
To: glibc-bugs
on a pole error or a domain error, log1p correctly raises an exception. But
errno is not set. It should be (respectively: ERANGE and 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: log1p() does not set errno n 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=6792
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* [Bug math/6792] log1p() does not set errno n error
2008-07-31 9:23 [Bug math/6792] New: log1p() does not set errno n error mtk dot manpages at gmail dot com
@ 2008-07-31 9:27 ` mtk dot manpages at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 9:27 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From mtk dot manpages at gmail dot com 2008-07-31 09:26 -------
Created an attachment (id=2854)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=2854&action=view)
test program
Sample runs demonstrating the problem
$ /tmp/mt_log1p -- -1
errno == 0
fetestexcept() says: FE_DIVBYZERO
log1p(-1.00000000000000000e+00)=-inf
0 FE_DIVBYZERO -inf
$ /tmp/mt_log1p -- -2
errno == 0
fetestexcept() says: FE_INVALID
log1p(-2.00000000000000000e+00)=nan
0 FE_INVALID nan
--
http://sourceware.org/bugzilla/show_bug.cgi?id=6792
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2008-07-31 9:23 [Bug math/6792] New: log1p() does not set errno n error mtk dot manpages at gmail dot com
2008-07-31 9:27 ` [Bug math/6792] " mtk dot manpages at gmail dot com
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