[vectorIntrinsics+compress] RFR: 8274664: Add support for compress/expand api methods

[Jatin Bhateja]

On Fri, 1 Oct 2021 22:33:43 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> Add support for the cross lane operations to compress/expand the lane elements of a vector selecting lanes under the control of a mask. The remaining lanes of the destination vector could be either set to zero or get the value from corresponding elements of the background vector.
> The following methods are added:
>  public abstract Vector<E> compress(VectorMask<E> m);
>  public abstract Vector<E> compress(VectorMask<E> m, Vector<E> v);
>  public abstract Vector<E> expand(VectorMask<E> m);
>  public abstract Vector<E> expand(VectorMask<E> m, Vector<E> v);

Hi @sviswa7 , I have a patch which intrinsifies these APIs and emits efficient code sequence for X86 AVX512 target.
I shall post it for review once this patch gets integrated.

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PR: https://git.openjdk.java.net/panama-vector/pull/143