<i18n dev> RFR: 8349189: Speed up DateTime parse & format via Class File API [v11]

[Shaojin Wen]

On Tue, 4 Feb 2025 13:39:28 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> By using the Class File API to dynamically generate a CompositePrinterParser, and defining DateTimePrinterParser[] printerParsers as a specific field, C2 can do TypeProfile optimization.
>> 
>> Since the CompositePrinterParser is generated based on the pattern, we can make the following optimizations:
>> 
>> 1. For example, for the parse and print of Month/DayOfMonth/Hour/Minute/Second with a fixed length of 2, do targeted parse and print optimization.
>> 
>> 2. Parse uses LocalDate/LocalTime/LocalDateTime/OffsetDateTime for TemporalQuery to avoid the overhead of constructing DateTimeParseContext.
>> 
>> These optimizations can significantly improve performance, with more than 100% performance improvement in many scenarios.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   more use getInt & add more test

Keep it alive.

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PR Comment: https://git.openjdk.org/jdk/pull/23384#issuecomment-2708922153