On Sat, Dec 9, 2017 at 1:11 PM, Martin Vignali <martin.vign...@gmail.com> wrote:
> the idea in AVX2 is to load 128bits of data (2x 64 bits)
> then shuffle accross lane, the two 64 bits in the low part of each lane, to
> keep the rest of the process similar
> to the sse version

What about using pmovzxbw instead of movu + vpermq + punpcklbw?

> for the store, the idea is similar in the opposite way (shuffle before
> store)

You could also do vextracti128 + 128-bit packuswb instead of 256-bit
packuswb + vpermq.
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