[Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors

[Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=6794

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

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

--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-03-01 02:25:35 UTC ---
Confirmed with current sources on x86.  On x86_64, none of these cases raise
exceptions or set errno at all (whereas on x86 some at least do raise
exceptions).

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[Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors

[aj at suse dot de]

http://sourceware.org/bugzilla/show_bug.cgi?id=6794

Andreas Jaeger <aj at suse dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |aj at suse dot de
         Resolution|                            |FIXED

--- Comment #4 from Andreas Jaeger <aj at suse dot de> 2012-04-17 20:14:59 UTC ---
Thanks for the report, this is fixed now in glibc for glibc 2.16 thanks to
Adhemerval Zanella .

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[Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 09:50 -------
Also, it is worth noting that log(), log2(), log10() do set errno and raise an
exception for the 0 and --inf cases.

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[Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 09:48 -------
Created an attachment (id=2856)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2856&action=view)
test program

Sample runs demonstrating problem.  In no case is errno set.  For the Inf and
-Inf cases, no exception is raised.

$ /tmp/mt_ilogb 0
errno == 0
fetestexcept() says:  FE_INVALID FE_DIVBYZERO
ilogb(0.00000000000000000e+00)=-2147483648
0 FE_DIVBYZERO normal

$ /tmp/mt_ilogb nan
errno == 0
fetestexcept() says:  FE_INVALID
ilogb(nan)=-2147483648
0 FE_INVALID normal

$ /tmp/mt_ilogb inf
errno == 0
fetestexcept() says:
ilogb(inf)=2147483647
0 0 normal

$ /tmp/mt_ilogb -- -inf
errno == 0
fetestexcept() says:
ilogb(-inf)=2147483647
0 0 normal


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