[Bug math/20233] [ldbl-128ibm] expm1l (sNaN) returns sNaN

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https://sourceware.org/bugzilla/show_bug.cgi?id=20233

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f8fc4b44942238dec3228c4e4d77553da2b3ec39

commit f8fc4b44942238dec3228c4e4d77553da2b3ec39
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Jun 9 17:24:52 2016 +0000

    Fix ldbl-128ibm expm1l (sNaN) (bug 20233).

    The ldbl-128ibm version of expm1l returns sNaN for sNaN input.  This
    patch fixes it to add such inputs to themselves so that qNaN is
    returned in this case.

    Tested for powerpc.

        [BZ #20233]
        * sysdeps/ieee754/ldbl-128ibm/s_expm1l.c (__expm1l): Add NaN input
        to itself.

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

Summary of changes:
 ChangeLog                              |    4 ++++
 sysdeps/ieee754/ldbl-128ibm/s_expm1l.c |    4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

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