[Bug math/16739] IBM long double nextafterl wrong on power of two value

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https://sourceware.org/bugzilla/show_bug.cgi?id=16739

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b0abbc21034f0e5edc49023d8fda0616173faf17

commit b0abbc21034f0e5edc49023d8fda0616173faf17
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Apr 2 13:46:19 2014 +1030

    Correct IBM long double nextafterl.

    Fix for values near a power of two, and some tidies.

        [BZ #16739]
        * sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (__nextafterl): Correct
        output when value is near a power of two.  Use int64_t for lx and
        remove casts.  Use decimal rather than hex exponent constants.
        Don't use long double multiplication when double will suffice.
        * math/libm-test.inc (nextafter_test_data): Add tests.
        * NEWS: Add 16739 and 16786 to bug list.

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

Summary of changes:
 ChangeLog                                  |   10 ++++++
 NEWS                                       |    2 +-
 math/libm-test.inc                         |    8 ++++
 sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c |   49 +++++++++++++++++++---------
 4 files changed, 52 insertions(+), 17 deletions(-)

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