[Bug math/16677] nextafter incorrect in directed rounding modes

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https://sourceware.org/bugzilla/show_bug.cgi?id=16677

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e9996ef750d845b46bc7d743c730c73f044720af

commit e9996ef750d845b46bc7d743c730c73f044720af
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Sat Mar 8 14:08:38 2014 +0000

    Add libm-test.inc macro for all-rounding-modes testing.

    This patch adds support in libm-test.inc for automatically running
    tests of a function in all rounding modes, in the form of a macro
    ALL_RM_TEST to loop over all rounding modes when running tests of a
    function, and uses it for functions whose results should always be
    independent of the rounding mode.

    Conversion of tests of nextafter to ALL_RM_TEST was deferred because
    trying that conversion showed up bug 16677.  (Finding such a bug of
    course illustrates the point of testing more systematically in all
    rounding modes rather than only reactively when bugs get reported in a
    particular function in a non-default mode.)  Conversion of tests where
    results can depend on the rounding mode will follow once I add
    gen-libm-test.pl support for using different initializers for the
    expected results for different rounding modes (again, some conversions
    may need deferring until bugs are fixed, depending on how
    straightforward they are to XFAIL in a particular context).

    Some existing tests get run five times rather than four, with
    round-to-nearest tests both run in that as default rounding mode and
    also with it explicitly set with fesetround (FE_TONEAREST).  This
    duplication doesn't seem particularly useful, so ALL_RM_TEST only runs
    tests four times.

    Tested x86_64 and x86.

        * math/libm-test.inc (ALL_RM_TEST): New macro.
        (ceil_test): Use ALL_RM_TEST.
        (cimag_test): Likewise.
        (conj_test): Likewise.
        (copysign_test): Likewise.
        (cproj_test): Likewise.
        (creal_test): Likewise.
        (fabs_test): Likewise.
        (floor_test): Likewise.
        (fmax_test): Likewise.
        (fmin_test): Likewise.
        (fmod_test): Likewise.
        (fpclassify_test): Likewise.
        (frexp_test): Likewise.
        (ilogb_test): Likewise.
        (isfinite_test): Likewise.
        (finite_test): Likewise.
        (isgreater_test): Likewise.
        (isgreaterequal_test): Likewise.
        (isinf_test): Likewise.
        (isless_test): Likewise.
        (islessequal_test): Likewise.
        (islessgreater_test): Likewise.
        (isnan_test): Likewise.
        (isnormal_test): Likewise.
        (issignaling_test): Likewise.
        (isunordered_test): Likewise.
        (logb_test): Likewise.
        (logb_downward_test_data): Remove.
        (logb_test_downward): Likewise.
        (lround_test): Use ALL_RM_TEST.
        (llround_test): Likewise.
        (modf_test): Likewise.
        (nexttoward_test): Likewise.
        (remainder_test): Likewise.
        (drem_test): Likewise.
        (remainder_tonearest_test_data): Likewise.
        (remainder_test_tonearest): Likewise.
        (drem_test_tonearest): Likewise.
        (remainder_towardzero_test_data): Likewise.
        (remainder_test_towardzero): Likewise.
        (drem_test_towardzero): Likewise.
        (remainder_downward_test_data): Likewise.
        (remainder_test_downward): Likewise.
        (drem_test_downward): Likewise.
        (remainder_upward_test_data): Likewise.
        (remainder_test_upward): Likewise.
        (drem_test_upward): Likewise.
        (remquo_test): Use ALL_RM_TEST.  Remove comment about x.
        (round_test): Use ALL_RM_TEST.
        (signbit_test): Likewise.
        (trunc_test): Likewise.
        (significand_test): Likewise.
        (main): Don't call removed functions.

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Summary of changes:
 ChangeLog          |   57 ++++++++
 math/libm-test.inc |  398 ++++++++++------------------------------------------
 2 files changed, 130 insertions(+), 325 deletions(-)

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