[Bug string/19583] SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD Excavator core

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19583

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The branch, hjl/pr19583 has been created
        at  327aadf6348bd41d1fae46ee7780e214c0a493c1 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=327aadf6348bd41d1fae46ee7780e214c0a493c1

commit 327aadf6348bd41d1fae46ee7780e214c0a493c1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Mar 23 10:33:19 2016 -0700

    [x86] Add a feature bit: Fast_Unaligned_Copy

    On AMD processors, memcpy optimized with unaligned SSE load is
    slower than emcpy optimized with aligned SSSE3 while other string
    functions are faster with unaligned SSE load.  A feature bit,
    Fast_Unaligned_Copy, is added to select memcpy optimized with
    unaligned SSE load.

        [BZ #19583]
        * sysdeps/x86/cpu-features.c (init_cpu_features): Set
        Fast_Unaligned_Copy with Fast_Unaligned_Load for Intel
        processors.  Set Fast_Copy_Backward for AMD Excavator
        processors.
        * sysdeps/x86/cpu-features.h (bit_arch_Fast_Unaligned_Copy):
        New.
        (index_arch_Fast_Unaligned_Copy): Likewise.
        * sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Check
        Fast_Unaligned_Copy instead of Fast_Unaligned_Load.

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