[vectorIntrinsics] RFR: 8266720: Wrong implementation in LibraryCallKit::inline_vector_shuffle_iota [v3]

[Xiaohong Gong]

On Thu, 3 Jun 2021 03:24:06 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> src/hotspot/share/opto/vectorIntrinsics.cpp line 467:
>> 
>>> 465:     } else {
>>> 466:       // Currently it works well for vector_length <= 1024-bits.
>>> 467:       // for vector_length > 1024, we don't support now
>> 
>> Does it need any vector length check or block for vector length >1024?
>
> Thank you for your review. It is a problem here. I will do that in next commit.

As discussed with @nsjian , can we currently make it unsupported as well for 1024-bits? It doesn't need to change any IR if 1024-bits is not supported. We can revisit this issue in future for vector length >= 1024-bits

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PR: https://git.openjdk.java.net/panama-vector/pull/81