[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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f781a9e96138d8839663af5e88649ab1fbed74f8

commit f781a9e96138d8839663af5e88649ab1fbed74f8
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Mar 22 07:46:56 2016 -0700

    Set index_arch_AVX_Fast_Unaligned_Load only for Intel processors

    Since only Intel processors with AVX2 have fast unaligned load, we
    should set index_arch_AVX_Fast_Unaligned_Load only for Intel processors.

    Move AVX, AVX2, AVX512, FMA and FMA4 detection into get_common_indeces
    and call get_common_indeces for other processors.

    Add CPU_FEATURES_CPU_P and CPU_FEATURES_ARCH_P to aoid loading
    GLRO(dl_x86_cpu_features) in cpu-features.c.

        [BZ #19583]
        * sysdeps/x86/cpu-features.c (get_common_indeces): Remove
        inline.  Check family before setting family, model and
        extended_model.  Set AVX, AVX2, AVX512, FMA and FMA4 usable
        bits here.
        (init_cpu_features): Replace HAS_CPU_FEATURE and
        HAS_ARCH_FEATURE with CPU_FEATURES_CPU_P and
        CPU_FEATURES_ARCH_P.  Set index_arch_AVX_Fast_Unaligned_Load
        for Intel processors with usable AVX2.  Call get_common_indeces
        for other processors with family == NULL.
        * sysdeps/x86/cpu-features.h (CPU_FEATURES_CPU_P): New macro.
        (CPU_FEATURES_ARCH_P): Likewise.
        (HAS_CPU_FEATURE): Use CPU_FEATURES_CPU_P.
        (HAS_ARCH_FEATURE): Use CPU_FEATURES_ARCH_P.

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

Summary of changes:
 ChangeLog                  |   17 +++++
 sysdeps/x86/cpu-features.c |  152 +++++++++++++++++++++++---------------------
 sysdeps/x86/cpu-features.h |   10 ++-
 3 files changed, 105 insertions(+), 74 deletions(-)

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