[Bug math/20205] [i386/x86_64] nextafterl incorrect incrementing negative subnormals

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https://sourceware.org/bugzilla/show_bug.cgi?id=20205

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8cbd1453ec1c59e54652edcd88256f4023ff77b9

commit 8cbd1453ec1c59e54652edcd88256f4023ff77b9
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Jun 3 21:30:12 2016 +0000

    Fix x86/x86_64 nextafterl incrementing negative subnormals (bug 20205).

    The x86 / x86_64 implementation of nextafterl (also used for
    nexttowardl) produces incorrect results (NaNs) when negative
    subnormals, the low 32 bits of whose mantissa are zero, are
    incremented towards zero.  This patch fixes this by disabling the
    logic to decrement the exponent in that case.

    Tested for x86_64 and x86.

        [BZ #20205]
        * sysdeps/i386/fpu/s_nextafterl.c (__nextafterl): Do not adjust
        exponent when incrementing negative subnormal with low mantissa
        word zero.
        * math/libm-test.inc (nextafter_test_data) [TEST_COND_intel96]:
        Add another test.

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

Summary of changes:
 ChangeLog                       |    9 +++++++++
 math/libm-test.inc              |    4 ++++
 sysdeps/i386/fpu/s_nextafterl.c |    2 +-
 3 files changed, 14 insertions(+), 1 deletions(-)

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