[vectorIntrinsics+mask] RFR: 8268154: Add masking support for vector load intrinsics

[Xiaohong Gong]

On Mon, 7 Jun 2021 09:05:44 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

> This patch adds the predicate support for masked load vector operation, including the Vector API java implementation and hotspot intrinsics changes. The main changes contain:
>   - Adding a new hotspot intrinsic method (`loadMasked`), which can transform the vector mask class and value to hotspot. It is called by the masked `"fromArray"` API in JAVA level. The compiler will generate the masked vector load node if the current platform supports the predicate feature and backend has implemented it. Otherwise, the vector blend pattern will be generated like before.
>   - Adding the similar masked support for load/store boolean/char array.
> 
> Note that the intrinsification when there is the array range bailout is not implemented in this patch. We are considering making it vectorized with predicate feature for SVE/AVX-512 as well, and will create a separate patch for it in future.
> 
> Also note that this patch doesn't contain any backend changes.

Hi @PaulSandoz , @sviswa7 , could you please take a look at the java side of this PR? Thanks so much!

Hi @iwanowww , could you please take a look at the compiler side of this PR? Thanks so much! Regarding to your feedback!

Best Regards,
Xiaohong

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PR: https://git.openjdk.java.net/panama-vector/pull/90