RFR: 8336831: Optimize StringConcatHelper.simpleConcat [v2]

[Chen Liang]

On Fri, 19 Jul 2024 19:18:43 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> Currently simpleConcat is implemented using mix and prepend, but in this simple scenario, it can be implemented in a simpler way and can improve performance.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   share newArray

src/java.base/share/classes/java/lang/StringConcatHelper.java line 371:

> 369:             return new String(s1);
> 370:         }
> 371:         byte coder = (byte) (s1.coder() | s2.coder());

Suggestion:

        int coder = s1.coder() | s2.coder();

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PR Review Comment: https://git.openjdk.org/jdk/pull/20253#discussion_r1684935704