[Bug math/16338] ldbl-128 logl does not handle subnormals

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http://sourceware.org/bugzilla/show_bug.cgi?id=16338

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2dec468fd82c6d968f622c2c519fcb8dc09bddac

commit 2dec468fd82c6d968f622c2c519fcb8dc09bddac
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Dec 18 11:38:27 2013 +0000

    Fix ldbl-128 logl for subnormals (bug 16338).

    This patch fixes bug 16338, ldbl-128 logl not handling subnormals
    (with consequent inaccuracy for lgammal as well).  The fix is simply
    to use __frexpl when determining the exponent, as done already in
    log2l and log10l.  Given the lack of testing of small arguments to any
    of the log* functions, appropriate tests are added for all of them.

    Tested x86_64 and x86 and ulps updated accordingly, and spot tests
    also run for mips64 to confirm the ldbl-128 fix.

    Note that while this fixes lgammal inaccuracy for small positive
    arguments, I suspect that there will still be problems with spurious
    underflows in that case.

        * sysdeps/ieee754/ldbl-128/e_logl.c (__ieee754_logl): Use __frexpl
        to determine exponent and adjust argument to have exponent of -1.
        * math/auto-libm-test-in: Add more tests of log, log10, log1p and
        log2.
        * math/auto-libm-test-out: Regenerated.
        * sysdeps/x86_64/fpu/libm-test-ulps: Update.

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

Summary of changes:
 ChangeLog                         |   11 +
 NEWS                              |    2 +-
 math/auto-libm-test-in            |   11 +
 math/auto-libm-test-out           |  790 +++++++++++++++++++++++++++++++++++++
 sysdeps/i386/fpu/libm-test-ulps   |    3 +
 sysdeps/ieee754/ldbl-128/e_logl.c |    5 +-
 sysdeps/x86_64/fpu/libm-test-ulps |    3 +
 7 files changed, 821 insertions(+), 4 deletions(-)

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