RFR: 8353741: Eliminate table lookup in UUID.toString [v3]

[Shaojin Wen]

On Mon, 19 May 2025 18:30:20 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   simplify code
>
> src/java.base/share/classes/java/util/UUID.java line 491:
> 
>> 489:      * hexadecimal representation, concatenate these hexadecimal strings into one continuous string, and then interpret
>> 490:      * this string as a hexadecimal number to form and return a long value.
>> 491:      */
> 
> Is there a reference describing this technique?  Such as the Hacker's Delight citation used in java.lang.Long?
> If not a longer descriptive comment would be good for maintainability.

This algorithm was researched and implemented by me, and I have added detailed description and comments

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PR Review Comment: https://git.openjdk.org/jdk/pull/22928#discussion_r2096658412