[Bug math/18595] ctan, ctanh missing underflows

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https://sourceware.org/bugzilla/show_bug.cgi?id=18595

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0b87419b690d1711697ed95808527400910ff997

commit 0b87419b690d1711697ed95808527400910ff997
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Sep 15 17:46:08 2015 +0000

    Fix ctan, ctanh missing underflows (bug 18595).

    Similar to various other bugs in this area, ctan and ctanh can fail to
    raise the underflow exception for some cases of results that are tiny
    and inexact.  This patch forces the exception in a similar way to
    previous fixes.

    Tested for x86_64 and x86.

        [BZ #18595]
        * math/s_ctan.c (__ctan): Force underflow exception for results
        whose real or imaginary part has small absolute value.
        * math/s_ctanf.c (__ctanf): Likewise.
        * math/s_ctanh.c (__ctanh): Likewise.
        * math/s_ctanhf.c (__ctanhf): Likewise.
        * math/s_ctanhl.c (__ctanhl): Likewise.
        * math/s_ctanl.c (__ctanl): Likewise.
        * math/auto-libm-test-in: Do not allow missing underflow for ctan
        and ctanh.  Add more tests of ctan and ctanh.

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

Summary of changes:
 ChangeLog               |   11 +
 NEWS                    |    8 +-
 math/auto-libm-test-in  |   26 +-
 math/auto-libm-test-out | 1032 ++++++++++++++++++++++++++++++++++++++---------
 math/s_ctan.c           |   10 +
 math/s_ctanf.c          |   10 +
 math/s_ctanh.c          |   10 +
 math/s_ctanhf.c         |   10 +
 math/s_ctanhl.c         |   10 +
 math/s_ctanl.c          |   10 +
 10 files changed, 923 insertions(+), 214 deletions(-)

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