RFR: JDK-8310502 : Optimization for j.l.Long.fastUUID() [v7]

Thu Jun 22 01:06:03 UTC 2023

On Thu, 22 Jun 2023 00:13:06 GMT, 温绍锦 <duke at openjdk.org> wrote:

>> By optimizing the implementation of java.lang.Long#fastUUID, the performance of the java.util.UUID#toString method can be significantly improved.
>> 
>> The following are the test results of JMH: 
>> 
>> Benchmark                     Mode  Cnt      Score      Error   Units
>> UUIDUtilsBenchmark.new       thrpt    5  92676.550 ±  292.213  ops/ms
>> UUIDUtilsBenchmark.original  thrpt    5  37040.165 ± 1023.532  ops/ms
>
> 温绍锦 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   move HEX256 to LongCache

fyi, the title of this PR need to match exactly the title of the bug [JDK-8310502](https://bugs.openjdk.org/browse/JDK-8310502).
The mismatch is an Integration blocker. (See the comment in the description).

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PR Comment: https://git.openjdk.org/jdk/pull/14578#issuecomment-1601874909