[Bug string/18880] Wrong selector in x86_64/multiarch/memcpy.S

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https://sourceware.org/bugzilla/show_bug.cgi?id=18880

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=14a1d7cc4c4fd5ee8e4e66b777221dd32a84efe8

commit 14a1d7cc4c4fd5ee8e4e66b777221dd32a84efe8
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Mar 4 08:37:40 2016 -0800

    x86-64: Fix memcpy IFUNC selection

    Chek Fast_Unaligned_Load, instead of Slow_BSF, and also check for
    Fast_Copy_Backward to enable __memcpy_ssse3_back.  Existing selection
    order is updated with following selection order:

    1. __memcpy_avx_unaligned if AVX_Fast_Unaligned_Load bit is set.
    2. __memcpy_sse2_unaligned if Fast_Unaligned_Load bit is set.
    3. __memcpy_sse2 if SSSE3 isn't available.
    4. __memcpy_ssse3_back if Fast_Copy_Backward bit it set.
    5. __memcpy_ssse3

        [BZ #18880]
        * sysdeps/x86_64/multiarch/memcpy.S: Check Fast_Unaligned_Load,
        instead of Slow_BSF, and also check for Fast_Copy_Backward to
        enable __memcpy_ssse3_back.

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

Summary of changes:
 ChangeLog                         |    8 ++++++++
 sysdeps/x86_64/multiarch/memcpy.S |   27 ++++++++++++++-------------
 2 files changed, 22 insertions(+), 13 deletions(-)

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