RFR: 8333833: UUID toString removes the use of ByteArrayLittleEndian [v2]

[Shaojin Wen]

On Sat, 8 Jun 2024 06:40:39 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> After PR #16245, C2 optimizes stores into primitive arrays by combining values ​​into larger stores. In the UUID.toString method, ByteArrayLittleEndian can be removed, making the code more elegant and faster.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add comments

The C2 optimization brought by PR #16245 makes many of the previous performance improvement techniques based on VarHandle/ByteArray/Unsafe no longer meaningful, and many optimizations based on this need to be changed back.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/19610#issuecomment-2156040853