[Bug math/20224] [i386] cbrtl (sNaN) returns sNaN

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https://sourceware.org/bugzilla/show_bug.cgi?id=20224

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=40720ec9f98d57214d73d6fa98019e684f2eb45a

commit 40720ec9f98d57214d73d6fa98019e684f2eb45a
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 8 21:02:40 2016 +0000

    Fix i386 cbrtl (sNaN) (bug 20224).

    The i386 version of cbrtl returns sNaN (without raising any
    exceptions) for sNaN input.  This patch fixes it to add non-finite
    arguments to themselves (the code path in question is also reached for
    zero arguments, for which adding them to themselves is also harmless),
    so that "invalid" is raised and qNaN returned.

    Tested for x86_64 and x86.

        [BZ #20224]
        * sysdeps/i386/fpu/s_cbrtl.S (__cbrtl): Add non-finite or zero
        argument to itself.
        * math/libm-test.inc (cbrt_test_data): Add sNaN tests.

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

Summary of changes:
 ChangeLog                  |    7 +++++++
 math/libm-test.inc         |    2 ++
 sysdeps/i386/fpu/s_cbrtl.S |    1 +
 3 files changed, 10 insertions(+), 0 deletions(-)

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