[Bug math/6786] erfc() does not set errno for underflow

[Bug math/6786] erfc() does not set errno for underflow

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=6786

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> 2012-02-29 21:06:48 UTC ---
Confirmed with current sources on both x86 and x86_64.

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[Bug math/6786] erfc() does not set errno for underflow

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=6786

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, master has been updated
       via  34e16df5a1a46e128edb9eb44a09ac5762957136 (commit)
      from  d8e2dbe3e380729a1552d546da582b02202dde0a (commit)

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=34e16df5a1a46e128edb9eb44a09ac5762957136

commit 34e16df5a1a46e128edb9eb44a09ac5762957136
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Dec 3 16:25:18 2013 +0000

    Fix erfc errno setting on underflow (bug 6786).

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                            |   18 ++
 NEWS                                 |   24 ++--
 math/auto-libm-test-in               |   13 ++-
 math/auto-libm-test-out              |  302 +++++++++++++++++++++++++++++++++-
 sysdeps/i386/fpu/libm-test-ulps      |    3 +
 sysdeps/ieee754/dbl-64/s_erf.c       |   17 ++-
 sysdeps/ieee754/flt-32/s_erff.c      |   19 ++-
 sysdeps/ieee754/ldbl-128/s_erfl.c    |   13 ++-
 sysdeps/ieee754/ldbl-128ibm/s_erfl.c |   13 ++-
 sysdeps/ieee754/ldbl-96/s_erfl.c     |   13 ++-
 sysdeps/x86_64/fpu/libm-test-ulps    |    3 +
 11 files changed, 410 insertions(+), 28 deletions(-)

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[Bug math/6786] erfc() does not set errno for underflow

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=6786

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

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

--- Comment #4 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.19.

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[Bug math/6786] erfc() does not set errno for underflow

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=6786

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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[Bug math/6786] erfc() does not set errno for underflow

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 08:52 -------
Created an attachment (id=2851)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2851&action=view)
test program

(I got the underflow value wrong in my initial report. I think 106.9 gives
underflow with the long double variant.  27 doies the trick for the double
version.)

Sample run showing problem:

$ /tmp/mt_erfc 27
errno == 0
fetestexcept() says:  FE_UNDERFLOW FE_INEXACT
erfc(2.70000000000000000e+01)=5.23704643935262924e-319
0 FE_UNDERFLOW subnormal


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