[Bug math/18049] [i386] atanhl spurious underflows

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https://sourceware.org/bugzilla/show_bug.cgi?id=18049

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8020a808870dc6199e584562b3b64f52054359e8

commit 8020a808870dc6199e584562b3b64f52054359e8
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri May 15 22:07:57 2015 +0000

    Fix atanhl missing underflows (bug 16352).

    Similar to various other bugs in this area, some atanh 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.  (No change in this regard is needed
    for the i386 implementation; special handling to force underflows in
    these cases will only be needed there when the spurious underflows,
    bug 18049, get fixed.)

    Tested for x86_64, x86, powerpc and mips64.

        [BZ #16352]
        * sysdeps/i386/fpu/e_atanh.S (dbl_min): New object.
        (__ieee754_atanh): Force underflow exception for results with
        small absolute value.
        * sysdeps/i386/fpu/e_atanhf.S (flt_min): New object.
        (__ieee754_atanhf): Force underflow exception for results with
        small absolute value.
        * sysdeps/ieee754/dbl-64/e_atanh.c: Include <float.h>.
        (__ieee754_atanh): Force underflow exception for results with
        small absolute value.
        * sysdeps/ieee754/flt-32/e_atanhf.c: Include <float.h>.
        (__ieee754_atanhf): Force underflow exception for results with
        small absolute value.
        * sysdeps/ieee754/ldbl-128/e_atanhl.c: Include <float.h>.
        (__ieee754_atanhl): Force underflow exception for results with
        small absolute value.
        * sysdeps/ieee754/ldbl-128ibm/e_atanhl.c: Include <float.h>.
        (__ieee754_atanhl): Force underflow exception for results with
        small absolute value.
        * sysdeps/ieee754/ldbl-96/e_atanhl.c: Include <float.h>.
        (__ieee754_atanhl): Force underflow exception for results with
        small absolute value.
        * math/auto-libm-test-in: Do not allow missing underflow
        exceptions from atanh.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                              |   26 ++++
 NEWS                                   |   17 ++-
 math/auto-libm-test-in                 |   13 +-
 math/auto-libm-test-out                |  236 ++++++++++++++++----------------
 sysdeps/i386/fpu/e_atanh.S             |   20 +++-
 sysdeps/i386/fpu/e_atanhf.S            |   20 +++-
 sysdeps/ieee754/dbl-64/e_atanh.c       |    6 +
 sysdeps/ieee754/flt-32/e_atanhf.c      |    6 +
 sysdeps/ieee754/ldbl-128/e_atanhl.c    |   11 ++-
 sysdeps/ieee754/ldbl-128ibm/e_atanhl.c |   11 ++-
 sysdeps/ieee754/ldbl-96/e_atanhl.c     |    6 +
 11 files changed, 235 insertions(+), 137 deletions(-)

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