[Bug math/19201] dbl-64 remainder incorrect sign of zero result

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https://sourceware.org/bugzilla/show_bug.cgi?id=19201

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=444ec6b8d8091456a2622765ac60f9c60e7755a9

commit 444ec6b8d8091456a2622765ac60f9c60e7755a9
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Nov 3 00:11:49 2015 +0000

    Fix dbl-64 remainder sign of zero result (bug 19201).

    For some large arguments, the dbl-64 implementation of remainder gives
    zero results with the wrong sign, resulting from a subtraction that is
    mathematically correct but does not guarantee that a zero result has
    the sign of the first argument to remainder.  This patch adds an
    appropriate check for this case, similar to other implementations of
    remainder in the case of equality, and adds tests of remainder on
    inputs already used to test remquo.

    Tested for x86_64 and x86.

        [BZ #19201]
        * sysdeps/ieee754/dbl-64/e_remainder.c (__ieee754_remainder):
        Check for zero remainder in case of large exponents and ensure
        correct sign of result in that case.
        * math/libm-test.inc (remainder_test_data): Add more tests.

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Summary of changes:
 ChangeLog                            |    6 +++
 NEWS                                 |    3 +-
 math/libm-test.inc                   |   69 ++++++++++++++++++++++++++++++++++
 sysdeps/ieee754/dbl-64/e_remainder.c |    2 +
 4 files changed, 79 insertions(+), 1 deletions(-)

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