[Bug math/17118] ctanh(INFINITY + 2 * I) returns incorrect value

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https://sourceware.org/bugzilla/show_bug.cgi?id=17118

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=61f893789862db1dfdf188f77cd215bab0814d2c

commit 61f893789862db1dfdf188f77cd215bab0814d2c
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Sep 17 21:21:39 2015 +0000

    Fix sign of zero part from ctan / ctanh when argument infinite (bug 17118).

    C99/C11 Annex G specifies the sign of the zero part of the result of
    ctan (x +/- i * Inf) and ctanh (+/-Inf + i * y).  This patch fixes glibc
    to follow that specification, along the lines I described in my review
    of Andreas's previous patch for this issue
    <https://sourceware.org/ml/libc-alpha/2014-08/msg00142.html>.

    Tested for x86_64.

    2015-09-17  Joseph Myers  <joseph@codesourcery.com>
            Andreas Schwab  <schwab@suse.de>

        [BZ #17118]
        * math/s_ctan.c (__ctan): Determine sign of zero real part of
        result when imaginary part of argument is infinite using sine and
        cosine.
        * math/s_ctanf.c (__ctanf): Likewise.
        * math/s_ctanl.c (__ctanl): Likewise.
        * math/s_ctanh.c (__ctanh): Determine sign of zero imaginary part
        of result when real part of argument is infinite using sine and
        cosine.
        * math/s_ctanhf.c (__ctanhf): Likewise.
        * math/s_ctanhl.c (__ctanhl): Likewise.
        * math/libm-test.inc (ctan_test_data): Add more tests of ctan.
        (ctanh_test_data): Add more tests of ctanh.

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

Summary of changes:
 ChangeLog          |   17 +++++++
 NEWS               |   10 ++--
 math/libm-test.inc |  128 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 math/s_ctan.c      |    9 +++-
 math/s_ctanf.c     |    9 +++-
 math/s_ctanh.c     |    9 +++-
 math/s_ctanhf.c    |    9 +++-
 math/s_ctanhl.c    |    9 +++-
 math/s_ctanl.c     |    9 +++-
 9 files changed, 198 insertions(+), 11 deletions(-)

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