[Bug math/16384] ldbl-128ibm acoshl inaccurate

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http://sourceware.org/bugzilla/show_bug.cgi?id=16384

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6

commit 396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Jan 2 16:33:06 2014 +0000

    Fix ldbl-128ibm acoshl inaccuracy (bug 16384).

    This patch fixes bug 16384, ldbl-128ibm acoshl inaccuracy, which
    showed up while attempting to regenerate ulps for powerpc-nofpu for
    2.19.  There were two separate problems, use of __log1p instead of
    __log1pl and an insufficiently accurate constant value for log 2
    (which this patch replaces by use of M_LN2l), each of which could
    cause substantial inaccuracy in affected cases.

    Tested for powerpc-nofpu.

        * sysdeps/ieee754/ldbl-128ibm/e_acoshl.c (ln2): Initialize with
        M_LN2l.
        (__ieee754_acoshl): Use __log1pl not __log1p.

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

Summary of changes:
 ChangeLog                              |    7 +++++++
 NEWS                                   |    2 +-
 sysdeps/ieee754/ldbl-128ibm/e_acoshl.c |    4 ++--
 3 files changed, 10 insertions(+), 3 deletions(-)

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