[vectorIntrinsics+compress] RFR: 8274837: Intel backend support for compress VectorAPI [v2]

[Joshua Zhu]

On Wed, 6 Oct 2021 22:46:31 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> I have only one input on match_rule_supported_vector. Also please bring the evcompress_reg instruct into this PR from 145. Rest of the patch looks good to me.

Sandhya, thanks for your review. I update the patch accordingly.

> src/hotspot/cpu/x86/x86.ad line 1818:
> 
>> 1816:         return false;
>> 1817:       }
>> 1818:       if (size_in_bits < 512 && !VM_Version::supports_avx512vl()) {
> 
> It would be better to add a separate case for Op_CompressV instead of adding it as a fallthrough to gather/scatter.

Done.

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PR: https://git.openjdk.java.net/panama-vector/pull/144