RFR: 8341141: Optimize DirectCodeBuilder [v23]

[Claes Redestad]

On Sat, 5 Oct 2024 16:33:50 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> Some DirectCodeBuilder related optimizations to improve startup and running performance:
>> 1. Merge calls, merge writeU1 and writeU2 into writeU3
>> 2. Merge calls, merge writeU1 and writeIndex operations
>> 3. Directly use writeU1 instead of writeBytecode
>> 4. Rewrite the implementation of load and store
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix merge error

I took this for a spin and results looks promising. Even a tentative win on the Write.jdkTree microbenchmark. The number of changes is a bit staggering so will take a while to thoroughly review in detail. I might be able to get through it all tomorrow.

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PR Comment: https://git.openjdk.org/jdk/pull/21243#issuecomment-2397739639