[Bug math/19351] [ldbl-128ibm] logl inaccurate near 1

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https://sourceware.org/bugzilla/show_bug.cgi?id=19351

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e6a6b1c3de62f3ae3f0e5ac5bdcc49a3342f03e7

commit e6a6b1c3de62f3ae3f0e5ac5bdcc49a3342f03e7
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Dec 9 23:51:11 2015 +0000

    Fix ldbl-128ibm logl inaccuracy near 1 (bug 19351).

    The ldbl-128ibm implementation of logl is inaccurate for arguments
    near 1, because when deciding whether to bypass a series expansion for
    log(1+z), where z = x-1, it compares the square of z rather than z
    itself with an epsilon value.  This patch fixes that comparison, so
    eliminating the test failures for inaccuracy of logl in such cases.

    Tested for powerpc.

        [BZ #19351]
        * sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): When
        expanding log(1+z), compare z rather than its square with epsilon
        to determine when to avoid evaluating the expansion.

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

Summary of changes:
 ChangeLog                            |    5 +++++
 sysdeps/ieee754/ldbl-128ibm/e_logl.c |    2 +-
 2 files changed, 6 insertions(+), 1 deletions(-)

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