[Bug math/16339] log1p missing underflows

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https://sourceware.org/bugzilla/show_bug.cgi?id=16339

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0b7a5f920163d03806d7c5d9d1c83b16942c9496

commit 0b7a5f920163d03806d7c5d9d1c83b16942c9496
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu May 14 23:38:07 2015 +0000

    Fix log1p missing underflows (bug 16339).

    Similar to various other bugs in this area, some log1p implementations
    do not raise the underflow exception for subnormal arguments, when the
    result is tiny and inexact.  This patch forces the exception in a
    similar way to previous fixes.  (The ldbl-128ibm implementation
    doesn't currently need any change as it already generates this
    exception, albeit through code that would generate spurious exceptions
    in other cases; special code for this issue will only be needed there
    when fixing the spurious exceptions.)

    Tested for x86_64, x86, powerpc and mips64.

        [BZ #16339]
        * sysdeps/i386/fpu/s_log1p.S (dbl_min): New object.
        (__log1p): Force underflow exception for results with small
        absolute value.
        * sysdeps/i386/fpu/s_log1pf.S (flt_min): New object.
        (__log1pf): Force underflow exception for results with small
        absolute value.
        * sysdeps/ieee754/dbl-64/s_log1p.c: Include <float.h>.
        (__log1p): Force underflow exception for results with small
        absolute value.
        * sysdeps/ieee754/flt-32/s_log1pf.c: Include <float.h>.
        (__log1pf): Force underflow exception for results with small
        absolute value.
        * sysdeps/ieee754/ldbl-128/s_log1pl.c: Include <float.h>.
        (__log1pl): Force underflow exception for results with small
        absolute value.
        * math/auto-libm-test-in: Do not allow missing underflow
        exceptions from log1p.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                           |   22 ++++
 NEWS                                |    2 +-
 math/auto-libm-test-in              |    9 +-
 math/auto-libm-test-out             |  200 +++++++++++++++++-----------------
 sysdeps/i386/fpu/s_log1p.S          |   27 +++++-
 sysdeps/i386/fpu/s_log1pf.S         |   27 +++++-
 sysdeps/ieee754/dbl-64/s_log1p.c    |   10 ++-
 sysdeps/ieee754/flt-32/s_log1pf.c   |    8 ++
 sysdeps/ieee754/ldbl-128/s_log1pl.c |    6 +
 9 files changed, 202 insertions(+), 109 deletions(-)

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