On Wed, 17 Jul 2024 13:44:58 GMT, Aleksey Shipilev <sh...@openjdk.org> wrote:

> > @shipilev Would you re-review this patch, or are you no longer interested 
> > now that `@Stable` is removed?
> 
> I am not sure I understand the performance implications for this change. I 
> can see the optimization for avoiding `Name` reallocation when we can rewrite 
> the `index` is from original JSR 292 work that introduced LFs. Maybe that 
> optimization is actually not worth it.

The old code made it possible to lazily initialize a `Name`'s index without 
creating a new `Name` instance. Another way to get there would be to explicitly 
specify the index when a `Name` is created.

When I started thinking about that yesterday, I thought maybe clients of 
`LambdaForm` shouldn't be in charge of creating `Name`s in the first place, and 
instead this should be handled by some `LambdaForm`-builder like utility, which 
can immediately fill in the right index. AFAICS, the only possible optimization 
that this would block is the sharing of `Name` instance with the same index in 
different `LambdaForms` (though, not sure if that's even done right now).

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PR Comment: https://git.openjdk.org/jdk/pull/20178#issuecomment-2233426807

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