[vectorIntrinsics+mask] RFR: 8271273: Java API and IR changes for masked compare operation [v2]

[Xiaohong Gong]

On Tue, 27 Jul 2021 10:37:27 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> - Re-organized the Java API implementation to use one common entry point of masked/non-masked vector compare operation.
>> - Intrinsic side changes to absorb newly passed mask if target support predicated instructions else handled appropriately by performing vector AND b/w comparison result and explicit mask.
>
> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8271273: Review comments resolution.

src/hotspot/share/opto/vectorIntrinsics.cpp line 1706:

> 1704:   if (is_masked_op && !use_predicate && !arch_supports_vector(Op_AndV, num_elem, elem_bt, VecMaskUseLoad)) {
> 1705:     if (C->print_intrinsics()) {
> 1706:       tty->print_cr("  ** not supported: arity=2 op=comp/%d vlen=%d etype=%s ismask=usestore is_masked_op=1",

What does `"ismask=usestore"` mean? Can this be removed?

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PR: https://git.openjdk.java.net/panama-vector/pull/103