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

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=706688aaefdeb48e63519525f11108ce14844a26

commit 706688aaefdeb48e63519525f11108ce14844a26
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Nov 26 13:54:55 2014 +0000

    FIx ldbl-128ibm frexpl for 32-bit systems (bug 16619, bug 16740).

    This patch fixes bugs in ldbl-128ibm frexpl for 32-bit systems shown
    up by warnings:

    ../sysdeps/ieee754/ldbl-128ibm/s_frexpl.c:82:4: warning: left shift count
>= width of type
    ../sysdeps/ieee754/ldbl-128ibm/s_frexpl.c:129:5: warning: left shift count
>= width of type

    This did in fact show up in test-ldouble.out (alongside all the other
    problems there ... maybe we should again consider running the libm
    tests at finer granularity from the makefiles) as already covered by
    the testsuite after the previous patch that fixed these bugs for
    64-bit systems.  The fix is simply using 1LL instead of 1L when
    shifting by 52.

    Tested for powerpc32 (soft float).

        [BZ #16619]
        [BZ #16740]
        * sysdeps/ieee754/ldbl-128ibm/s_frexpl.c (__frexpl): Use 1LL << 52
        instead of 1L << 52.

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

Summary of changes:
 ChangeLog                              |    5 +++++
 NEWS                                   |    8 ++++----
 sysdeps/ieee754/ldbl-128ibm/s_frexpl.c |    4 ++--
 3 files changed, 11 insertions(+), 6 deletions(-)

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