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[Bug math/16619] [ldbl-128ibm] frexpl bad results on some denormal arguments


https://sourceware.org/bugzilla/show_bug.cgi?id=16619

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=aa5f0ff11ad2cc85277c64cf65c723a9664e1149

commit aa5f0ff11ad2cc85277c64cf65c723a9664e1149
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Apr 16 19:33:32 2014 +0930

    Correct IBM long double frexpl.

    Besides fixing the bugzilla, this also fixes corner-cases where the high
    and low double differ greatly in magnitude, and handles a denormal
    input without resorting to a fp rescale.

        [BZ #16740]
        [BZ #16619]
        * sysdeps/ieee754/ldbl-128ibm/s_frexpl.c (__frexpl): Rewrite.
        * math/libm-test.inc (frexp_test_data): Add tests.

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

Summary of changes:
 ChangeLog                              |    7 ++
 math/libm-test.inc                     |    9 ++
 sysdeps/ieee754/ldbl-128ibm/s_frexpl.c |  146 ++++++++++++++++++++++----------
 3 files changed, 118 insertions(+), 44 deletions(-)

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