[Bug math/19593] [ldbl-128ibm] truncl incorrect in non-default rounding modes

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https://sourceware.org/bugzilla/show_bug.cgi?id=19593

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e2310a27bede834c7b63a8bd1d659c376b6388df

commit e2310a27bede834c7b63a8bd1d659c376b6388df
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Feb 18 21:52:07 2016 +0000

    Fix ldbl-128ibm truncl for non-default rounding modes (bug 19593).

    The ldbl-128ibm implementation of truncl is only correct in
    round-to-nearest mode (in other modes, there are incorrect results and
    overflow exceptions in some cases).  It is also unnecessarily
    complicated, rounding both high and low parts to the nearest integer
    and then adjusting for the semantics of trunc, when it seems more
    natural to take the truncation of the high part (__trunc optimized
    inline versions can be used), and the floor or ceiling of the low part
    (depending on the sign of the high part) if the high part is an
    integer, as was done for floorl and ceill.  This patch makes it use
    that simpler approach.

    Tested for powerpc.

        [BZ #19593]
        * sysdeps/ieee754/ldbl-128ibm/s_truncl.c (__truncl): Use __trunc
        on high part and __floor or __ceil on low part then use
        ldbl_canonicalize_int if needed.

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

Summary of changes:
 ChangeLog                              |    5 +++
 sysdeps/ieee754/ldbl-128ibm/s_truncl.c |   50 +++++++-------------------------
 2 files changed, 16 insertions(+), 39 deletions(-)

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