[Bug math/19077] New: [ldbl-128ibm] logl (1) incorrect sign of zero result

[Bug math/19077] New: [ldbl-128ibm] logl (1) incorrect sign of zero result

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19077

            Bug ID: 19077
           Summary: [ldbl-128ibm] logl (1) incorrect sign of zero result
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc*-*-*

The ldbl-128ibm implementation of logl produces a zero with the wrong sign for
logl (1) in FE_DOWNWARD mode:

Failure: Test: log_downward (0x1p+0)
Result:
 is:         -0.00000000000000000000000000000000e+00 
-0x0.000000000000000000000000000p+0
 should be:   0.00000000000000000000000000000000e+00  
0x0.000000000000000000000000000p+0
 difference:  0.00000000000000000000000000000000e+00  
0x0.000000000000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  1.0000

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[Bug math/19077] [ldbl-128ibm] logl (1) incorrect sign of zero result

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19077

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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       via  31d4459e42d239fb7d9d3f9532fcf580c6812fb3 (commit)
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=31d4459e42d239fb7d9d3f9532fcf580c6812fb3

commit 31d4459e42d239fb7d9d3f9532fcf580c6812fb3
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Oct 6 15:32:06 2015 +0000

    Fix ldbl-128ibm logl (1) sign of zero result (bug 19077).

    The ldbl-128ibm implementation of logl produces a zero with the wrong
    sign for logl (1) in FE_DOWNWARD mode.  This patch makes it explicitly
    return 0.0L in that case, as in e.g. the ldbl-128 implementation.

    Tested for powerpc.

        [BZ #19077]
        * sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): Return
        0.0L for argument 1.0L.

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

Summary of changes:
 ChangeLog                            |    4 ++++
 NEWS                                 |    2 +-
 sysdeps/ieee754/ldbl-128ibm/e_logl.c |    2 ++
 3 files changed, 7 insertions(+), 1 deletions(-)

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[Bug math/19077] [ldbl-128ibm] logl (1) incorrect sign of zero result

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19077

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.23

--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.23.

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