RFR: 8339640: Reduce construction overheads in StringConcatFactory$InlineHiddenClassStrategy

Fri Sep 6 08:02:50 UTC 2024

On Fri, 6 Sep 2024 07:39:45 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> Using the trusted `invokeBasic` method streamlines invokers and avoids spinning up of some type conversion handles. This reduces classes generated in a few scalability stress tests.

In the Strings stress test generated by https://cl4es.github.io/snippets/StringGen.java number of generated classes drops from 6298 to 5522.  

No statistically significant change on `StringConcatStartup`, but instrumenting bytecode executed shows the disappearance of various `invoke_MT` calls.

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PR Comment: https://git.openjdk.org/jdk/pull/20884#issuecomment-2333475480