[Bug math/16559] Missing underflow exception from j1/jn

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https://sourceware.org/bugzilla/show_bug.cgi?id=16559

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=63dbe5f32238858c7b953b867ed0588c7808dd4f

commit 63dbe5f32238858c7b953b867ed0588c7808dd4f
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Jun 29 16:52:16 2015 +0000

    Fix j1, jn missing underflows (bug 16559).

    Similar to various other bugs in this area, j1 and jn implementations
    can fail to raise the underflow exception when the internal
    computation is exact although the actual function is inexact.  This
    patch forces the exception in a similar way to other such fixes.  (The
    ldbl-128 / ldbl-128ibm j1l implementation is different and doesn't
    need a change for this until spurious underflows in it are fixed.)

    Tested for x86_64, x86, mips64 and powerpc.

        [BZ #16559]
        * sysdeps/ieee754/dbl-64/e_j1.c: Include <float.h>.
        (__ieee754_j1): Force underflow exception for small results.
        * sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_jn): Likewise.
        * sysdeps/ieee754/flt-32/e_j1f.c: Include <float.h>.
        (__ieee754_j1f): Force underflow exception for small results.
        * sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_jnf): Likewise.
        * sysdeps/ieee754/ldbl-128/e_jnl.c (__ieee754_jnl): Likewise.
        * sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_jnl): Likewise.
        * sysdeps/ieee754/ldbl-96/e_j1l.c: Include <float.h>.
        (__ieee754_j1l): Force underflow exception for small results.
        * sysdeps/ieee754/ldbl-96/e_jnl.c (__ieee754_jnl): Likewise.
        * math/auto-libm-test-in: Add more tests of j1 and jn.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                           |   15 +
 NEWS                                |   30 +-
 math/auto-libm-test-in              |   16 +
 math/auto-libm-test-out             |  948 +++++++++++++++++++++++++++++++++++
 sysdeps/ieee754/dbl-64/e_j1.c       |   13 +-
 sysdeps/ieee754/dbl-64/e_jn.c       |    5 +
 sysdeps/ieee754/flt-32/e_j1f.c      |   10 +-
 sysdeps/ieee754/flt-32/e_jnf.c      |    4 +
 sysdeps/ieee754/ldbl-128/e_jnl.c    |    5 +
 sysdeps/ieee754/ldbl-128ibm/e_jnl.c |    5 +
 sysdeps/ieee754/ldbl-96/e_j1l.c     |   13 +-
 sysdeps/ieee754/ldbl-96/e_jnl.c     |    5 +
 12 files changed, 1049 insertions(+), 20 deletions(-)

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