[vectorIntrinsics] RFR: 8281562:[vectorapi] Add support for popcount operation

[Smita Kamath]

On Wed, 9 Feb 2022 23:10:17 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> 8281562:[vectorapi] Add support for popcount operation
>
> src/jdk.incubator.vector/share/classes/jdk/incubator/vector/VectorOperators.java line 454:
> 
>> 452:     public static final Unary NEG = unary("NEG", "-a", VectorSupport.VECTOR_OP_NEG, VO_ALL|VO_SPECIAL);
>> 453:     /** Produce {@code bitCount(a)} */
>> 454:     public static final Unary POPCNT = unary("POPCNT", "popcnt", VectorSupport.VECTOR_OP_POPCNT, VO_NOFP);
> 
> Suggest we rename to BIT_COUNT, so its the same as the method on `Integer` and `Long`. LIkewise for the internal opcode VECTOR_OP_POPCNT -> VECTOR_OP_BIT_COUNT.

Thanks for your comments, Paul. I will make the required changes.

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PR: https://git.openjdk.java.net/panama-vector/pull/173