[Bug math/16740] IBM long double frexpl wrong when value slightly smaller than a power of two

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https://sourceware.org/bugzilla/show_bug.cgi?id=16740

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1

commit 524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Feb 26 12:57:21 2015 +0000

    Fix ldbl-128ibm ilogbl near powers of 2 (bug 18029).

    The ldbl-128ibm implementation of ilogbl produces incorrect results
    when the high part of the argument is a power of 2 and the low part a
    nonzero number with the opposite sign (and so the returned exponent
    should be 1 less than that of the high part).  For example, ilogbl
    (0x1.ffffffffffffffp1L) returns 2 but should return 1.  (This is
    similar to (fixed) bug 16740 for frexpl, and bug 18030 for logbl.)
    This patch adds checks for that case.

    Tested for powerpc.

        [BZ #18029]
        * sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c (__ieee754_ilogbl):
        Adjust exponent of power of 2 down when low part has opposite
        sign.
        * math/libm-test.inc (ilogb_test_data): Add more tests.

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

Summary of changes:
 ChangeLog                              |    8 ++++++++
 NEWS                                   |    2 +-
 math/libm-test.inc                     |    5 +++++
 sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c |   23 +++++++++++++++++++----
 4 files changed, 33 insertions(+), 5 deletions(-)

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