[Bug math/19594] [ldbl-128ibm] roundl incorrect in non-default rounding modes

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https://sourceware.org/bugzilla/show_bug.cgi?id=19594

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b9a76339be2514c700d801e179ef9b6c910eaedf

commit b9a76339be2514c700d801e179ef9b6c910eaedf
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Feb 18 22:24:32 2016 +0000

    Fix ldbl-128ibm roundl for non-default rounding modes (bug 19594).

    The ldbl-128ibm implementation of roundl is only correct in
    round-to-nearest mode (in other modes, there are incorrect results and
    overflow exceptions in some cases).  This patch reimplements it along
    the lines used for floorl, ceill and truncl, using __round on the high
    part, and on the low part if the high part is an integer, and then
    adjusting in the cases where this is incorrect.

    Tested for powerpc.

        [BZ #19594]
        * sysdeps/ieee754/ldbl-128ibm/s_roundl.c (__roundl): Use __round
        on high and low parts then adjust result and use
        ldbl_canonicalize_int if needed.

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

Summary of changes:
 ChangeLog                              |    5 ++
 sysdeps/ieee754/ldbl-128ibm/s_roundl.c |   70 +++++++++++++++----------------
 2 files changed, 39 insertions(+), 36 deletions(-)

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