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

[温绍锦]

On Thu, 22 Jun 2023 05:48:34 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> 温绍锦 has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   move HEX256 to LongCache
>
> src/java.base/share/classes/java/lang/Long.java line 1233:
> 
>> 1231:                 HEX256[i] = (char) (((hi < 10 ? '0' + hi : 'a' + hi - 10) << 8)
>> 1232:                         + (lo < 10 ? '0' + lo : 'a' + lo - 10));
>> 1233:             }
> 
> Did you mean to put this in LongCache and is the intention it be archived or are you putting this into its own holder class? Right now it's confusing as HEX256 is not read from the archive.

i have already used a separate holder class "DigitCache", and modifiers do not use private because I will submit a new optimization using HEX256 for Integer.toHexString and Long.toHexString

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PR Review Comment: https://git.openjdk.org/jdk/pull/14578#discussion_r1238135779