Re: [Xen-devel] [V3] x86/cpuid: AVX-512 Feature Detection

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.06.16 at 13:45, <luwei.kang@xxxxxxxxx> wrote:
> From table 2-2 I can see that
> AVX512F          = AVX512F & AVX512VL
> AVX512CD      = AVX512F & AVX512VL & AVX512CD
> AVX512DQ      = AVX512F & AVX512VL & AVX512DQ
> AVX512BW     = AVX512F & AVX512VL & AVX512BW
> AVX512IFMA = AVX512F & AVX512VL & AVX512IFMA
> AVX512VBMI = AVX512F & AVX512VL & AVX512VBMI
> 
> From this depends list  some AVX512 feature also depends on AVX512VL.

You mis-interpreted that table - its left column header clearly says
"Usage of 256/128 Vector Lengths".

Jan


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