On Tue, 20 Aug 2024 12:39:14 GMT, Shaojin Wen <d...@openjdk.org> wrote:

>> The current implementation of ofDescriptor puts return type and parameter 
>> types together in an ArrayList, and then splits them into return type and 
>> array of parameter types. This ArrayList creation is unnecessary, 
>> considering most descriptors only have few parameter types.
>> 
>> By splitting return type and parameter types separately and scanning the 
>> descriptor first to get the number of parameters, we can just allocate an 
>> exact, trusted array for the resulting MethodTypeDesc without copy.
>
> Shaojin Wen has updated the pull request incrementally with one additional 
> commit since the last revision:
> 
>   remove specialization for `Ljava/lang/Object;`

Thanks for your performance improvement without too much impact on the long 
descriptor cases!

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PR Comment: https://git.openjdk.org/jdk/pull/20611#issuecomment-2302258488

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