RFR: 8322768: Optimize non-subword vector compress and expand APIs for AVX2 target. [v5]

[Jatin Bhateja]

On Fri, 19 Jan 2024 07:43:18 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> For long/double each permute row is 32 byte in size, so a shift by 5 to compute row address.
>
> Ah right. Maybe we could say `32byte = 4 long = 4 * 64bit`.
> Because "64bit row" sounds like the whole row is only 64 bit long. It is actually the cells that are 64bits, not the rows!

DONE

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PR Review Comment: https://git.openjdk.org/jdk/pull/17261#discussion_r1459568064