[Bug math/19076] [ldbl-128ibm] log1pl (-1) wrong sign of infinity

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https://sourceware.org/bugzilla/show_bug.cgi?id=19076

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d79b56892651fcfc1ae0f44d3d29d0fa03538ec1

commit d79b56892651fcfc1ae0f44d3d29d0fa03538ec1
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Oct 6 15:14:26 2015 +0000

    Fix ldbl-128ibm log1pl (-1) sign of infinity (bug 19076).

    The ldbl-128ibm implementation of log1pl produces an infinity with the
    wrong sign for log1pl (-1) in FE_DOWNWARD mode.  This patch fixes this
    by changing a division (-1.0L / (x - x)) (incorrect in FE_DOWNWARD
    mode) to (-1.0L / 0.0L) (correct in all rounding modes).

    Tested for powerpc.

        [BZ #19076]
        * sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (__log1pl): Divide by
        constant 0.0L when computing infinite result.

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

Summary of changes:
 ChangeLog                              |    6 ++++++
 NEWS                                   |    2 +-
 sysdeps/ieee754/ldbl-128ibm/s_log1pl.c |    2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

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