Autoconf Archive branch, master, updated. v2013.06.09-5-g3551eeb

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- Log -----------------------------------------------------------------
commit 3551eeb56bcb7a79b348ad1d175004d6d34cfafb
Author: Michael Petch <address@hidden>
Date:   Sat Jul 6 11:34:07 2013 +0200

    AX_EXT: determine if the OS actually supports AVX
    
    AX_EXT checks for different SIMD variants on a CPU. It checks for AVX, but
    doesn't go far enough to actually be useful in some cases. It is possible 
to be
    on a CPU with AVX support and the OS doesn't support it. We should be 
checking
    that such support exists. This is via an additional check of cpuinfo's ECX
    register bit 27. Then one needs to call xgetbv and if EAX&0b110 = 0b110 then
    AVX is supported by the CPU and OS.
    
    Further details are at <http://savannah.gnu.org/patch/?8084>.

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

Summary of changes:
 NEWS                                               |    4 ++
 m4/ax_ext.m4                                       |   53 ++++++++++++++-----
 ...x_gcc_x86_cpuid.m4 => ax_gcc_x86_avx_xgetbv.m4} |   54 ++++++++++----------
 3 files changed, 70 insertions(+), 41 deletions(-)
 copy m4/{ax_gcc_x86_cpuid.m4 => ax_gcc_x86_avx_xgetbv.m4} (57%)


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