[Bug math/22568] [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)

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https://sourceware.org/bugzilla/show_bug.cgi?id=22568

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d15e83c5f5231d971472b5ffc9219d54056ca0f1

commit d15e83c5f5231d971472b5ffc9219d54056ca0f1
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Dec 7 16:21:00 2017 +0000

    Fix ctanh (0 + i NaN), ctanh (0 + i Inf) (bug 22568, DR#471).

    As per C11 DR#471, ctanh (0 + i NaN) and ctanh (0 + i Inf) should
    return 0 + i NaN (with "invalid" exception in the second case but not
    the first), not NaN + i NaN.  This has corresponding implications for
    ctan since its special cases are defined by ctan (z) = -i ctanh (iz).
    This patch implements these cases for ctanh and ctan, updating
    tests accordingly.

    Tested for x86_64.

        [BZ #22568]
        * math/s_ctan_template.c (M_DECL_FUNC (__ctan)): Set imaginary
        part of result to imaginary part of argument if it is zero and the
        real part of the argument is not finite.
        * math/s_ctanh_template.c (M_DECL_FUNC (__ctanh)): Set real part
        of result to real part of argument if it is zero and the imaginary
        part of the argument is not finite.

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

Summary of changes:
 ChangeLog                |   10 ++++++++++
 math/libm-test-ctan.inc  |   12 ++++++------
 math/libm-test-ctanh.inc |   12 ++++++------
 math/s_ctan_template.c   |    5 ++++-
 math/s_ctanh_template.c  |    5 ++++-
 5 files changed, 30 insertions(+), 14 deletions(-)

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