[Bug math/887] Math library function "logb" and "nextafter" inconsistent

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http://sourceware.org/bugzilla/show_bug.cgi?id=887

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a5a326f660c020a4f85ce2ca2a3a2ccb4be7a058

commit a5a326f660c020a4f85ce2ca2a3a2ccb4be7a058
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Jan 7 22:41:58 2014 +0000

    Mark more libm tests with xfail-rounding:ldbl-128ibm.

    This patch marks more libm tests as expected to fail for ldbl-128ibm
    in non-default rounding modes.  Given this, my expm1l fix
    <https://sourceware.org/ml/libc-alpha/2014-01/msg00135.html> and my
    libgcc fix <http://gcc.gnu.org/ml/gcc-patches/2014-01/msg00157.html>
    for spurious overflows, the remaining failures in test-ldouble.out
    (for powerpc32 hard float) are small ulps, spurious underflow and
    inexact exceptions (the former probably arising from libgcc bugs
    though I haven't checked each case; the latter are barely meaningful
    for this format anyway when basic arithmetic isn't correctly rounding,
    though most of them are probably GCC bug 59412 which doesn't actually
    involve long double), missing underflow exceptions from clog, ctan and
    ctanh (probably one of the known bugs for another function), and logb
    in round-downward mode (bug 887, though it's really a GCC bug that
    we're not currently working around).

    Tested for powerpc32 hard float.

        * math/auto-libm-test-in: Mark various tests with
        xfail-rounding:ldbl-128ibm.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog               |    4 +
 math/auto-libm-test-in  |   40 ++-
 math/auto-libm-test-out |  832 +++++++++++++++++++++++-----------------------
 3 files changed, 443 insertions(+), 433 deletions(-)

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