[Bug math/18197] atan inaccuracy

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https://sourceware.org/bugzilla/show_bug.cgi?id=18197

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ae63c7ebedcaa57017df4cb8ff0494a4705321ee

commit ae63c7ebedcaa57017df4cb8ff0494a4705321ee
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Apr 8 17:14:12 2015 +0000

    Fix dbl-64 atan in non-default rounding modes (bug 18197).

    The dbl-64 implementation of atan does computations that expect to run
    in round-to-nearest mode, and in other modes the errors can accumulate
    to more than the maximum accepted 9ulp.  This patch makes it use
    FE_TONEAREST internally, similar to other functions with such issues.

    Tested for x86_64 and x86; no ulps updates needed.

        [BZ #18197]
        * sysdeps/ieee754/dbl-64/s_atan.c: Include <fenv.h>.
        (atan): Set FE_TONEAREST mode for internal computations.
        * math/auto-libm-test-in: Add more tests of atan.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                       |    8 ++++++
 NEWS                            |    2 +-
 math/auto-libm-test-in          |    2 +
 math/auto-libm-test-out         |   50 +++++++++++++++++++++++++++++++++++++++
 sysdeps/ieee754/dbl-64/s_atan.c |    2 +
 5 files changed, 63 insertions(+), 1 deletions(-)

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