RFR: 8223347: Integration of Vector API (Incubator)

[Paul Sandoz]

On Thu, 1 Oct 2020 00:25:46 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> @DamonFool we can follow up later for that fix (and others in `vectorIntrinsics`), after this PR integrates. I don't
>> want to perturb the code that has already been reviewed, which requires yet more additional review.
>
> Hi @PaulSandoz ,
> 
> I think it would be better to integrate it [1] in this MR.
> 
> I have tested this MR on our AVX512 machines and it still crashes.
> Also, for the sake of maintenance, it seems NOT a good idea to push a problematic commit into the jdk main-line repo.
> 
> As for the review process, I don't think it's a problem since the fix [1] is clear and small enough.
> 
> What do you think?
> 
> Thanks.
> 
> [1] https://github.com/openjdk/panama-vector/commit/1af35c357066743935bd3f48ce3610a41761f89a

@DamonFool I appreciate your efforts on this but i want to hold back on that issue and follow up very quickly after
integration of this PR. This change has been through an extremely long and arduous review process, and i want to stick
to what was reviewed and not ask reviewers to go through further cycles on what overall is a very large change.
Unfortunately this change is in a holding pattern waiting for the CSR to be approved thereby increasing the window
where we might find further issues (that if we had already integrated may have been dealt with separately perhaps in a
less timely fashion with respect to that integration). Unless an issue is extremely severe I think we should queue them
up in `panama-vector/vectorIntrinsics` (there is at least one more for ARM SVE that is queued up). Since the issue you
describe effects one instruction, for one type, on AVX512, its impact is limited and will be mitigated by a quick
follow up.

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PR: https://git.openjdk.java.net/jdk/pull/367