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

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

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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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