On Fri, 27 May 2022 14:18:19 GMT, Claes Redestad <redes...@openjdk.org> wrote:

> In preparation of #8855 this PR refactors the conversions from `List` to 
> array and array to `List`, reducing the number of conversions when calling 
> `MethodHandles.dropArguments` in particular. This remove about ~5% of 
> allocations on the `StringConcatFactoryBootstraps` microbenchmark.

If `parameterList` is too slow for `List.of` copies the backing parameter types 
array, wouldn't calling `JavaUtilCollectionAccess::listFromTrustedArray` a 
better alternative, as it only allocates one wrapper and has better performance 
on `subList` than `Arrays.copyOfRange`?

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PR: https://git.openjdk.java.net/jdk/pull/8923

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