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

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

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

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, hjl/pr19583 has been created
        at  dd036a26804d4bb10f3a74d7b916163b77150884 (commit)

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dd036a26804d4bb10f3a74d7b916163b77150884

commit dd036a26804d4bb10f3a74d7b916163b77150884
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.

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

-- 
You are receiving this mail because:
You are on the CC list for the bug.