[Bug math/19032] [i386] acosh (-qNaN) spurious "invalid" exception

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https://sourceware.org/bugzilla/show_bug.cgi?id=19032

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8c6c9236361fbc077769673c259828216403bc33

commit 8c6c9236361fbc077769673c259828216403bc33
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Sep 30 21:44:42 2015 +0000

    Fix i386 acosh (-qNaN) spurious "invalid" exception.

    The i386 versions of acoshf and acosh raise a spurious "invalid"
    exception for an argument that is a quiet NaN with the sign bit set.
    The integer arithmetic to detect arguments < 1 also detects -NaN, and
    then the computation 0 / 0 in that case raises the exception.  This
    patch fixes this by using (x - x) / (x - x) as the computation in that
    case instead, which will always raise the exception for non-NaN
    arguments reaching that code, but not for quiet NaN arguments.

    Tested for x86_64 and x86.

        [BZ #19032]
        * sysdeps/i386/fpu/e_acosh.S (__ieee754_acosh): For arguments < 1,
        compute result as (x - x) / (x - x) not as 0 / 0.
        * sysdeps/i386/fpu/e_acoshf.S (__ieee754_acoshf): Likewise.
        * math/libm-test.inc (acosh_test_data): Add another test of acosh.

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

Summary of changes:
 ChangeLog                   |    6 ++++++
 NEWS                        |    2 +-
 math/libm-test.inc          |    1 +
 sysdeps/i386/fpu/e_acosh.S  |    5 +++--
 sysdeps/i386/fpu/e_acoshf.S |    5 +++--
 5 files changed, 14 insertions(+), 5 deletions(-)

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