[Bug math/18593] csin, csinh bad overflow results in directed rounding modes

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https://sourceware.org/bugzilla/show_bug.cgi?id=18593

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ac831b362ad6ecd49643625481ec700a9812e52f

commit ac831b362ad6ecd49643625481ec700a9812e52f
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 24 16:20:48 2015 +0000

    Fix csin, csinh overflow in directed rounding modes (bug 18593).

    csin and csinh can produce bad results when overflowing in directed
    rounding modes, because a multiplication that can overflow is followed
    by a possible negation.  This patch fixes this by negating one of the
    arguments of the multiplication before the multiplication instead of
    negating the result.

    The new tests for this issue are added to auto-libm-test-in, starting
    use of that file for csin and csinh.  The issue was found in the
    course of moving existing tests for csin and csinh (existing tests, by
    being enabled in more cases than previously, showed the issue for
    float and double but not for long double); that move will now be done
    separately.

    Tested for x86_64 and x86 and ulps updated accordingly.

        [BZ #18593]
        * math/s_csin.c (__csin): Negate before rather than after possibly
        overflowing multiplication.
        * math/s_csinf.c (__csinf): Likewise.
        * math/s_csinh.c (__csinh): Likewise.
        * math/s_csinhf.c (__csinhf): Likewise.
        * math/s_csinhl.c (__csinhl): Likewise.
        * math/s_csinl.c (__csinl): Likewise.
        * math/auto-libm-test-in: Add some tests of csin and csinh.
        * math/auto-libm-test-out: Regenerated.
        * math/libm-test.inc (csin_test_data): Use AUTO_TESTS_c_c.
        (csinh_test_data): Likewise.
        * sysdeps/x86_64/fpu/libm-test-ulps: Update.

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

Summary of changes:
 ChangeLog                         |   14 +++
 NEWS                              |    2 +-
 math/auto-libm-test-in            |   10 ++
 math/auto-libm-test-out           |  200 +++++++++++++++++++++++++++++++++++++
 math/libm-test.inc                |    4 +
 math/s_csin.c                     |    6 +-
 math/s_csinf.c                    |    6 +-
 math/s_csinh.c                    |    6 +-
 math/s_csinhf.c                   |    6 +-
 math/s_csinhl.c                   |    6 +-
 math/s_csinl.c                    |    6 +-
 sysdeps/x86_64/fpu/libm-test-ulps |    8 +-
 12 files changed, 251 insertions(+), 23 deletions(-)

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