RFR: 8336831: Optimize StringConcatHelper.simpleConcat [v2]

[Chen Liang]

On Fri, 19 Jul 2024 20:55:03 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> 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();
>
> Converting coder to int type requires processing when calling new String(byte[], byte)

You are right, I ignored that `coder` is reused again below. My bad!

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PR Review Comment: https://git.openjdk.org/jdk/pull/20253#discussion_r1684964634