[vectorIntrinsics] RFR: 8283598: [vectorapi] Add new vector operation for compress bits

Tue Mar 29 19:15:14 UTC 2022

On Thu, 24 Mar 2022 06:31:31 GMT, Smita Kamath <svkamath at openjdk.org> wrote:

> Hi,
> 
> I've added support for new vector operations for compressing bits of integral vector types(Byte/Short/Integer/Long).
> The implementation is based on Compress or Generalized Extract mentioned in Hackers Delight by Henry S. Warren, Jr.
> The implementation does the following: given a mask and the number to be compressed, the bits of the number corresponding to the set mask bit are selected and compressed. 
> 
> Currently, this PR addresses only Java changes for compress bits operation. I've also updated the test framework.
> Do review and share feedback.

Here's the issue for scalar compress and expand bits [JDK-8283892](https://bugs.openjdk.java.net/browse/JDK-8283892)

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PR: https://git.openjdk.java.net/panama-vector/pull/184