[Bug math/22693] [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception

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https://sourceware.org/bugzilla/show_bug.cgi?id=22693

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b303185df9b4f3d097956fe566a32aed4f85b127

commit b303185df9b4f3d097956fe566a32aed4f85b127
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jan 10 17:59:01 2018 +0000

    Fix ldbl-128ibm log1pl (-qNaN) spurious "invalid" exception (bug 22693).

    The ldbl-128ibm implementation of log1pl does ordered comparisons on a
    negative qNaN argument, so resulting in spurious "invalid" exceptions
    (for soft-float powerpc; hard-float only avoids this because of GCC
    bug 58684 meaning ordered comparison instructions never get
    generated).  This patch fixes this by arranging for the test for NaN
    or infinity arguments to handle negative arguments as well.

    Tested for powerpc (soft float).

        [BZ #22693]
        * sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (__log1pl): Handle
        negative arguments in test for NaN or infinity argument.

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

Summary of changes:
 ChangeLog                              |    6 ++++++
 sysdeps/ieee754/ldbl-128ibm/s_log1pl.c |    4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

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