[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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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e41b395523040fcb58c7d378475720c2836d280c

commit e41b395523040fcb58c7d378475720c2836d280c
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Mar 28 04:39:48 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.

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

Summary of changes:
 ChangeLog                         |   14 ++++++++++++++
 sysdeps/x86/cpu-features.c        |   14 +++++++++++++-
 sysdeps/x86/cpu-features.h        |    3 +++
 sysdeps/x86_64/multiarch/memcpy.S |    2 +-
 4 files changed, 31 insertions(+), 2 deletions(-)

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