[Bug math/16284] Bad overflowing exp results for directed rounding

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https://sourceware.org/bugzilla/show_bug.cgi?id=16284

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8c92dfff412c20dc0c483ea68444d093a5672de0

commit 8c92dfff412c20dc0c483ea68444d093a5672de0
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Mar 21 00:03:38 2014 +0000

    Test most libm functions in all rounding modes.

    This patch makes libm-test.inc tests of most functions use ALL_RM_TEST
    unless there was some reason to defer that change for a particular
    function.

    I started out planning to defer the change for pow (bug 16315), cexp /
    ccos / ccosh / csin / csinh (likely fallout from exp, bug 16284) and
    cpow (exact expectations for signs of exact zero results not wanted).
    Testing on x86_64 and x86 showed additional failures for acosh, cacos,
    catan, catanh, clog, clog10, jn, log, log10, log1p, log2, tgamma, yn,
    so making the change for those functions was deferred as well, pending
    investigation to show which of these represent distinct bugs (some
    such bugs may already be filed) and appropriate fixing / XFAILing.
    Failures include wrong signs of zero results, errors slightly above
    the 9ulp bound (in such cases it may make sense for functions to set
    round-to-nearest internally to reduce error accumulation), large
    errors and incorrect overflow/underflow for the rounding mode (with
    consequent missing errno settings in some cases).  It's possible some
    could be issues with test expectations, though I didn't notice any
    that were obviously like that (I added NO_TEST_INLINE for cases that
    were failing for ildoubl on x86 and where it seemed reasonable for
    them to fail for the fast-math inlines).

    There may of course be failures on other architectures for functions
    that didn't fail on x86_64 or x86, in which case the usual rule
    applies: file a bug (preferably identifying the underlying problem
    function, in cases where function A calls function B and a problem
    with function B may present in the test results for function A) if not
    already in Bugzilla then fix or XFAIL.

    Tested x86_64 and x86 and ulps updated accordingly.

        * math/libm-test.inc (asinh_test): Use ALL_RM_TEST.
        (atan_test): Likewise.
        (atanh_test_data): Use NO_TEST_INLINE for two tests.
        (atanh_test): Use ALL_RM_TEST.
        (atan2_test_data): Likewise.
        (cabs_test): Likewise.
        (cacosh_test): Likewise.
        (carg_test): Likewise.
        (casin_test): Likewise.
        (casinh_test): Likewise.
        (cbrt_test): Likewise.
        (csqrt_test): Likewise.
        (erf_test): Likewise.
        (erfc_test): Likewise.
        (pow10_test): Likewise.
        (exp2_test): Likewise.
        (hypot_test): Likewise.
        (j0_test): Likewise.
        (j1_test): Likewise.
        (lgamma_test): Likewise.
        (gamma_test): Likewise.
        (sincos_test): Likewise.
        (tanh_test): Likewise.
        (y0_test): Likewise.
        (y1_test): Likewise.
        * sysdeps/i386/fpu/libm-test-ulps: Update.
        * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.

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

Summary of changes:
 ChangeLog                         |   30 ++
 math/libm-test.inc                |  100 ++-----
 sysdeps/i386/fpu/libm-test-ulps   |  574 +++++++++++++++++++++++++++++++++++
 sysdeps/x86_64/fpu/libm-test-ulps |  592 +++++++++++++++++++++++++++++++++++++
 4 files changed, 1222 insertions(+), 74 deletions(-)

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