[Bug math/16353] expm1 missing underflows

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https://sourceware.org/bugzilla/show_bug.cgi?id=16353

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=554edb23ffc7a953ca86309cc5f02dbd1a63abe0

commit 554edb23ffc7a953ca86309cc5f02dbd1a63abe0
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Jun 22 21:06:19 2015 +0000

    Fix expm1 missing underflows (bug 16353).

    Similar to various other bugs in this area, some expm1 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 issue does not apply to the ldbl-* implementations or to those
    for x86 / x86_64 long double.  The change to
    sysdeps/ieee754/dbl-64/wordsize-64/e_cosh.c is one I missed when
    previously fixing bug 16354; the bug in that implementation was
    previously latent, but the expm1 fixes stopped it being latent and so
    required it to be fixed to avoid spurious underflows from cosh.)

    Tested for x86_64 and x86.

        [BZ #16353]
        * sysdeps/i386/fpu/s_expm1.S (dbl_min): New object.
        (__expm1): Force underflow exception for arguments with small
        absolute value.
        * sysdeps/i386/fpu/s_expm1f.S (flt_min): New object.
        (__expm1f): Force underflow exception for arguments with small
        absolute value.
        * sysdeps/ieee754/dbl-64/s_expm1.c: Include <float.h>.
        (__expm1): Force underflow exception for arguments with small
        absolute value.
        * sysdeps/ieee754/flt-32/s_expm1f.c: Include <float.h>.
        (__expm1f): Force underflow exception for arguments with small
        absolute value.
        * sysdeps/ieee754/dbl-64/wordsize-64/e_cosh.c (__ieee754_cosh):
        Check for small arguments before calling __expm1.
        * math/auto-libm-test-in: Do not mark underflow exceptions as
        possibly missing for bug 16353.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                                   |   21 +++
 NEWS                                        |   28 ++--
 math/auto-libm-test-in                      |   11 +-
 math/auto-libm-test-out                     |  226 +++++++++++++-------------
 sysdeps/i386/fpu/s_expm1.S                  |   22 +++
 sysdeps/i386/fpu/s_expm1f.S                 |   22 +++
 sysdeps/ieee754/dbl-64/s_expm1.c            |    6 +
 sysdeps/ieee754/dbl-64/wordsize-64/e_cosh.c |    3 +-
 sysdeps/ieee754/flt-32/s_expm1f.c           |    6 +
 9 files changed, 211 insertions(+), 134 deletions(-)

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