[vectorIntrinsics] RFR: 8258072: Add Reinterpret nodes implementation for Arm SVE [v3]

[Wang Huang]

On Mon, 28 Dec 2020 09:43:54 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix ReinterpretNode check bug
>
> src/hotspot/share/opto/vectorIntrinsics.cpp line 1836:
> 
>> 1834:       // Since number elements from input is larger than output, simply reduce size of input (we are supposed to
>> 1835:       // drop top elements anyway).
>> 1836:       int num_elem_for_resize = MAX2(num_elem_to, Matcher::min_vector_size(elem_bt_from));
> 
> Looks like a bug to me. 
> Can you elaborate, please, how it manifests and does it cause any misbehavior? 
> I'm concerned that it should be fixed separately upstream.

Yes, we think it is a bug.  I reported a bug : https://bugs.openjdk.java.net/browse/JDK-8258989

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PR: https://git.openjdk.java.net/panama-vector/pull/29