[vectorIntrinsics+mask] RFR: 8270349: Initial X86 backend support for optimizing masking operations on AVX512 targets. [v3]

[Jatin Bhateja]

On Mon, 26 Jul 2021 10:30:42 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> VectorNode::make_mask_node is only going to be called for masked operations. I don't think AndVMask is being created for non-predicated targets.  So we can take either approach.
>
> Ok, can the opcodes like `AndVMask` be blocked for non-predicated targets in `Matcher::match_rule_supported` ?

Matcher::match_rule_supported only check the existence of pattern based on the opcode and default return value is true. 
AddVI v1 v2
AddVI v1 v2 mask

Where as match_rule_supported_vector_masked initially calls match_rule_supported, it then return false in default case and true only for operations for which masked patterns exist.

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PR: https://git.openjdk.java.net/panama-vector/pull/99