RFR: 8265816: Handle new VectorMaskCast node for x86

Fri Apr 23 18:58:27 UTC 2021

On Fri, 23 Apr 2021 01:44:27 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> To eliminate unnecessary vector mask conversion during unboxing a
>> VectorMaskCast node was added as part of JDK-8264104 for aarch64. This patch handles the x86 side of it.
>> 
>> Please review.
>> 
>> Best Regards,
>> Sandhya
>
> Is there a small program which can be used to verify the effect of this opt?
> I just want to learn how this kind of opt works, not to require a jtreg test.
> Thanks.

@DamonFool I see this case come up for the existing Vector API jtreg tests e.g. Float256VectorTests.EQFloat256VectorTestsMasked.

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PR: https://git.openjdk.java.net/jdk/pull/3645