[Bug math/18586] [ldbl-128] expl missing underflows

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https://sourceware.org/bugzilla/show_bug.cgi?id=18586

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8475ab16848cf2adb6ce3446749c2f1d10233286

commit 8475ab16848cf2adb6ce3446749c2f1d10233286
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 24 15:12:03 2015 +0000

    Fix ldbl-128 expl missing underflows (bug 18586).

    Similar to various other bugs in this area, the ldbl-128 expl
    implementation does not raise the underflow exception for all
    subnormal results, if the scaling down is exact although the actual
    result is inexact.  This patch fixes this by forcing the exception in
    this case (the tests that failed before and pass after the test are
    already in the testsuite).

    Tested for mips64.

        [BZ #18586]
        * sysdeps/ieee754/ldbl-128/e_expl.c (__ieee754_expl): Force
        underflow exception for small results.

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

Summary of changes:
 ChangeLog                         |    6 ++++++
 NEWS                              |    2 +-
 sysdeps/ieee754/ldbl-128/e_expl.c |   10 +++++++++-
 3 files changed, 16 insertions(+), 2 deletions(-)

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