[Bug math/19189] [ldbl-128] log1pl (-qNaN) spurious "invalid" exception

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https://sourceware.org/bugzilla/show_bug.cgi?id=19189

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=af1b2fd08388a3beec3ee7eaa30646d9c002824e

commit af1b2fd08388a3beec3ee7eaa30646d9c002824e
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Oct 29 23:09:51 2015 +0000

    Fix ldbl-128 log1pl (-qNaN) spurious "invalid" exception (bug 19189).

    The ldbl-128 version of log1pl raises a spurious "invalid" exception
    for a -qNaN argument.  This patch fixes this by making the initial
    check for infinities and NaNs handle arguments of both signs in such a
    way that NaNs result in a NaN being returned (quietly if the input NaN
    was quiet) while +Inf results in +Inf being returned and -Inf results
    in a qNaN being returned with "invalid" exception raised.

    Tested for mips64.

        [BZ #19189]
        * sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl): Make check for
        non-finite argument handle arguments with negative sign.

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

Summary of changes:
 ChangeLog                           |    4 ++++
 NEWS                                |    2 +-
 sysdeps/ieee754/ldbl-128/s_log1pl.c |    4 ++--
 3 files changed, 7 insertions(+), 3 deletions(-)

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