[Bug math/16386] ldbl-128ibm logl inaccurate

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http://sourceware.org/bugzilla/show_bug.cgi?id=16386

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=819e5d50dd4d10dc359037eba74c70e74cb42739

commit 819e5d50dd4d10dc359037eba74c70e74cb42739
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Jan 2 16:35:46 2014 +0000

    Fix ldbl-128ibm logl inaccuracy (bug 16386).

    This patch fixes bug 16386, ldbl-128ibm logl inaccuracy (with
    consequent inaccuracy for lgammal) for arguments where the high double
    is subnormal, which showed up while attempting to regenerate ulps for
    powerpc-nofpu for 2.19.  The problem here is logic failing to allow
    for subnormals when calculating the exponent of the argument.  Tested
    for powerpc-nofpu.

        * sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): Adjust
        numbers with subnormal high part when calculating exponent.

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

Summary of changes:
 ChangeLog                            |    4 ++++
 NEWS                                 |    3 ++-
 sysdeps/ieee754/ldbl-128ibm/e_logl.c |    8 ++++++++
 3 files changed, 14 insertions(+), 1 deletions(-)

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