[Bug math/20156] [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN argument

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https://sourceware.org/bugzilla/show_bug.cgi?id=20156

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bba14195895fa612a8ef484e9856127a1be4f80f

commit bba14195895fa612a8ef484e9856127a1be4f80f
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri May 27 13:59:24 2016 +0000

    Fix ldbl-128ibm ceill, rintl etc. for sNaN arguments (bug 20156).

    The ldbl-128ibm implementations of ceill, floorl, roundl, truncl,
    rintl and nearbyintl wrongly return an sNaN when given an sNaN
    argument.  This patch fixes them to add such an argument to itself to
    turn it into a quiet NaN.  (The code structure means this "else" case
    applies to any argument which is zero or not finite; it's OK to do
    this in all such cases.)

    Tested for powerpc.

        [BZ #20156]
        * sysdeps/ieee754/ldbl-128ibm/s_ceill.c (__ceill): Add high part
        to itself when zero or not finite.
        * sysdeps/ieee754/ldbl-128ibm/s_floorl.c (__floorl): Likewise.
        * sysdeps/ieee754/ldbl-128ibm/s_rintl.c (__rintl): Likewise.
        * sysdeps/ieee754/ldbl-128ibm/s_roundl.c (__roundl): Likewise.
        * sysdeps/ieee754/ldbl-128ibm/s_truncl.c (__truncl): Likewise.

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

Summary of changes:
 ChangeLog                              |   10 ++++++++++
 sysdeps/ieee754/ldbl-128ibm/s_ceill.c  |    3 +++
 sysdeps/ieee754/ldbl-128ibm/s_floorl.c |    3 +++
 sysdeps/ieee754/ldbl-128ibm/s_rintl.c  |    3 +++
 sysdeps/ieee754/ldbl-128ibm/s_roundl.c |    3 +++
 sysdeps/ieee754/ldbl-128ibm/s_truncl.c |    3 +++
 6 files changed, 25 insertions(+), 0 deletions(-)

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