[Bug math/20252] atan2 (sNaN, qNaN) fails to raise "invalid"

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https://sourceware.org/bugzilla/show_bug.cgi?id=20252

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a2ae1696f7c6cf269b3a734bce4d9d3620745854

commit a2ae1696f7c6cf269b3a734bce4d9d3620745854
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Jun 13 21:43:22 2016 +0000

    Fix dbl-64 atan2 (sNaN, qNaN) (bug 20252).

    The dbl-64 implementation of atan2, passed arguments (sNaN, qNaN),
    fails to raise the "invalid" exception.  This patch fixes it to add
    both arguments, rather than just adding the second argument to itself,
    in the case where the second argument is a NaN (which is checked for
    before checking for the first argument being a NaN).  sNaN tests for
    atan2 are added, along with some qNaN tests I noticed were missing but
    should have been there by analogy with other tests present.

    Tested for x86_64 and x86.

        [BZ #20252]
        * sysdeps/ieee754/dbl-64/e_atan2.c (__ieee754_atan2): Add both
        arguments when second argument is a NaN.
        * math/libm-test.inc (atan2_test_data): Add sNaN tests and more
        qNaN tests.

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

Summary of changes:
 ChangeLog                        |    6 ++++
 math/libm-test.inc               |   62 ++++++++++++++++++++++++++++++++++++++
 sysdeps/ieee754/dbl-64/e_atan2.c |    2 +-
 3 files changed, 69 insertions(+), 1 deletions(-)

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