[Bug math/16928] cacos wrong sign of zero in FE_DOWNWARD mode

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https://sourceware.org/bugzilla/show_bug.cgi?id=16928

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=01dbacd22a8d5e0053f8d0cf13a80286b6cfe79b

commit 01dbacd22a8d5e0053f8d0cf13a80286b6cfe79b
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed May 14 12:37:24 2014 +0000

    Fix cacos (+Inf + finite*i) in round-downward mode (bug 16928).

    According to C99/C11 Annex G, cacos applied to a value with real part
    +Inf and finite imaginary part should produce a result with real part
    +0.  glibc wrongly produces a result with real part -0 in FE_DOWNWARD
    mode.  This patch fixes this by checking for zero results in the
    relevant case of non-finite arguments (where there should never be a
    result with -0 real part), and converts the tests of cacos to
    ALL_RM_TEST.

    Tested x86_64 and x86 and ulps updated accordingly.

        [BZ #16928]
        * math/s_cacos.c (__cacos): Ensure zero real part of result from
        non-finite arguments is +0.
        * math/s_cacosf.c (__cacosf): Likewise.
        * math/s_cacosl.c (__cacosl): Likewise.
        * math/libm-test.inc (cacos_test): Use ALL_RM_TEST.
        * sysdeps/i386/fpu/libm-test-ulps: Update.
        * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.

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

Summary of changes:
 ChangeLog                         |    9 +++++++
 NEWS                              |    2 +-
 math/libm-test.inc                |    4 +--
 math/s_cacos.c                    |    2 +
 math/s_cacosf.c                   |    2 +
 math/s_cacosl.c                   |    2 +
 sysdeps/i386/fpu/libm-test-ulps   |   48 +++++++++++++++++++++++++++++++++++++
 sysdeps/x86_64/fpu/libm-test-ulps |   48 +++++++++++++++++++++++++++++++++++++
 8 files changed, 113 insertions(+), 4 deletions(-)

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