[Bug math/18210] clog10 inaccuracy

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https://sourceware.org/bugzilla/show_bug.cgi?id=18210

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8431838dde9187c061ac64b8d61290e8de021dda

commit 8431838dde9187c061ac64b8d61290e8de021dda
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Apr 8 17:32:17 2015 +0000

    Fix dbl-64 atan2 in non-default rounding modes (bug 18210, bug 18211).

    The dbl-64 implementation of atan2 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.  Tests that previously produced large errors are added for
    atan2 and the closely related carg, clog and clog10 functions.

    Tested for x86_64 and x86 and ulps updated accordingly.

        [BZ #18210]
        [BZ #18211]
        * sysdeps/ieee754/dbl-64/e_atan2.c: Include <fenv.h>.
        (__ieee754_atan2): Set FE_TONEAREST mode for internal
        computations.
        * math/auto-libm-test-in: Add more tests of atan2, carg, clog and
        clog10.
        * math/auto-libm-test-out: Regenerated.
        * sysdeps/i386/fpu/libm-test-ulps: Update.
        * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.

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

Summary of changes:
 ChangeLog                         |   11 +
 NEWS                              |    3 +-
 math/auto-libm-test-in            |   34 ++
 math/auto-libm-test-out           |  800 +++++++++++++++++++++++++++++++++++++
 sysdeps/i386/fpu/libm-test-ulps   |    8 +-
 sysdeps/ieee754/dbl-64/e_atan2.c  |    2 +
 sysdeps/x86_64/fpu/libm-test-ulps |   72 ++--
 7 files changed, 893 insertions(+), 37 deletions(-)

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