[PATCH] x86: Use AVX2 memcpy/memset on Skylake server [BZ #21396]

[Florian Weimer]

On 04/18/2017 08:37 PM, H.J. Lu wrote:
> On Skylake server, AVX512 load/store instructions in memcpy/memset may
> lead to lower CPU turbo frequency in certain situations.  Use of AVX2
> in memcpy/memset has been observed to have improved overall performance
> in many workloads due to the higher frequency.

Since you bring this up: I think I have read reports that this happens 
with AVX2 and some parts, too.

The change itself looks reasonable.

Thanks,
Florian