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[Bug math/20718] [powerpc] copysignl raises "invalid" for sNaN


https://sourceware.org/bugzilla/show_bug.cgi?id=20718

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=05f3ed0a799d08c2b3ecc256fc0dc08d8b9a3784

commit 05f3ed0a799d08c2b3ecc256fc0dc08d8b9a3784
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Oct 19 22:58:34 2016 +0000

    Stop powerpc copysignl raising "invalid" for sNaN argument (bug 20718).

    The powerpc (hard-float) implementations of copysignl, both 32-bit and
    64-bit, raise spurious "invalid" exceptions when the first argument is
    a signaling NaN.  copysign functions should never raise exceptions
    even for signaling NaNs.

    The problem is the use of an fcmpu instruction to test the sign of the
    high part of the long double argument.  This patch fixes the functions
    to use fsel instead (as used for fabsl following my fixes for a
    similar bug there), or to examine the integer representation for older
    32-bit processors without fsel.

    Tested for powerpc64 and powerpc32 (configurations with and without
    fsel used).

        [BZ #20718]
        * sysdeps/powerpc/powerpc32/fpu/s_copysignl.S (__copysignl): Do
        not use floating-point comparisons to test sign.
        * sysdeps/powerpc/powerpc64/fpu/s_copysignl.S (__copysignl):
        Likewise.

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

Summary of changes:
 ChangeLog                                   |    6 ++++++
 sysdeps/powerpc/powerpc32/fpu/s_copysignl.S |   23 ++++++++++++++++++++---
 sysdeps/powerpc/powerpc64/fpu/s_copysignl.S |   10 ++++------
 3 files changed, 30 insertions(+), 9 deletions(-)

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