[Bug math/6805] j0(), j1(), jn() do not raise exceptions on underflow error

[Bug math/6805] j0(), j1(), jn() do not raise exceptions on underflow error

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=6805

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|aj at suse dot de           |unassigned at sourceware
                   |                            |dot org

--- Comment #4 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-03-01 17:50:32 UTC ---
See http://sourceware.org/ml/libc-alpha/2012-02/msg00512.html - the correct
result won't underflow in these cases but in whatever cases TLOSS errors are
given I suppose underflow should be raised as well.

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[Bug math/6805] j0(), j1(), jn() do not raise exceptions on underflow error

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=6805

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #5 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
It's now documented that exceptions may not be raised when libm is in the
(deprecated) error-handling modes that use matherr, which are the only cases
where TLOSS errors may occur (since 
commit c36e1d2369f149a64c759f3ad6f4cc5a03b03b62).

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[Bug math/6805] New: j0(), j1(), jn() do not raise exceptions on underflow error

[mtk dot manpages at gmail dot com]

On an underflow error, j0(), j1(), and jn() correctly set errno to ERANGE, but
do not raise an IEEE exception.  They should raise the FE_UNDERFLOW exception.

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: j0(), j1(), jn() do not raise exceptions on underflow
                    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=6805

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[Bug math/6805] j0(), j1(), jn() do not raise exceptions on underflow error

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 11:28 -------
Created an attachment (id=2872)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2872&action=view)
test program


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[Bug math/6805] j0(), j1(), jn() do not raise exceptions on underflow error

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 11:28 -------
Created an attachment (id=2871)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2871&action=view)
test program


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[Bug math/6805] j0(), j1(), jn() do not raise exceptions on underflow error

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 11:29 -------
Created an attachment (id=2873)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2873&action=view)
test program

Sample runs demonstrating the problem:

$ /tmp/mt_j0 1e100
errno == ERANGE
fetestexcept() says:  FE_INEXACT
j0(1.00000000000000002e+100)=0.00000000000000000e+00
ERANGE 0 +0

$ /tmp/mt_j1 1e100
errno == ERANGE
fetestexcept() says:  FE_INEXACT
j1(1.00000000000000002e+100)=0.00000000000000000e+00
ERANGE 0 +0

$ /tmp/mt_jn 10 1e100
errno == ERANGE
fetestexcept() says:  FE_INEXACT
jn(10,1.00000000000000002e+100)=0.00000000000000000e+00
ERANGE 0 +0


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