RFR: 8327858: Improve spliterator and forEach for single-element immutable collections [v2]

[Viktor Klang]

On Thu, 21 Mar 2024 18:01:38 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Please review this patch that:
>> 1. Implemented `forEach` to optimize for 1 or 2 element collections.
>> 2. Implemented `spliterator` to optimize for a single element.
>> 
>> The default implementations for multiple-element immutable collections are fine as-is, specializing implementation doesn't provide much benefit.
>
> Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 13 commits:
> 
>  - Use the improved form in forEach
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Null checks should probably be in the beginning...
>  - mark implicit null checks
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Copyright year, revert changes for non-few element collections
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Merge branch 'feature/imm-coll-stream' of https://github.com/liachmodded/jdk into feature/imm-coll-stream
>  - Spliterator for 12, iterate/forEach benchmark
>  - fix comments
>  - ... and 3 more: https://git.openjdk.org/jdk/compare/d5b95a0e...69bd0e9c

@stuart-marks & @AlanBateman Specialization of forEach() and spliterator()?

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PR Comment: https://git.openjdk.org/jdk/pull/15834#issuecomment-2072240066