[Bug math/22561] [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2

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https://sourceware.org/bugzilla/show_bug.cgi?id=22561

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5244527da1bfa751492e146d3e6ae128c59bfcc4

commit 5244527da1bfa751492e146d3e6ae128c59bfcc4
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Dec 6 21:35:20 2017 +0000

    Make cacosh (0 + iNaN) return NaN + i pi/2 (bug 22561, DR#471).

    As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 +
    iNaN) should return NaN +/- i pi/2, not NaN + iNaN.

    This patch fixes the code accordingly.  The test has hardcoded the
    result with positive sign of the imaginary part (with an associated
    comment), since the unspecified sign for a result other than 0 or
    infinity isn't currently supported by the test infrastructure.

    Tested for x86_64.

        [BZ #22561]
        * math/s_cacosh_template.c (M_DECL_FUNC (__cacosh)): Use pi/2 for
        real part of result for argument 0 + i * NaN.
        * math/libm-test-cacosh.inc (cacosh_test_data): Update expected
        results for tests of 0 + i * NaN.

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

Summary of changes:
 ChangeLog                 |    8 ++++++++
 math/libm-test-cacosh.inc |    9 +++++++--
 math/s_cacosh_template.c  |    5 ++++-
 3 files changed, 19 insertions(+), 3 deletions(-)

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