RFR: 8336856: Optimize String Concat [v20]

[Claes Redestad]

On Sun, 28 Jul 2024 15:59:05 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> The current implementation of StringConcat is to mix the coder and length into a long. This operation will have some overhead for int/long/boolean types. We can separate the calculation of the coder from the calculation of the length, which can improve the performance in the scenario of concat int/long/boolean.
>> 
>> This idea comes from the suggestion of @l4es in the discussion of PR https://github.com/openjdk/jdk/pull/20253#issuecomment-2240412866
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert "cache generate MethodHandle"
>   
>   This reverts commit 996ffb5ba46aa2861b48cc783d5c824d3721f976.

Sent a couple of suggestions in form of a PR here: https://github.com/wenshao/jdk/pull/8

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PR Comment: https://git.openjdk.org/jdk/pull/20273#issuecomment-2260497537