Withdrawn: 8349189: Speed up DateTime parse & format via Class File API

[duke]

On Fri, 31 Jan 2025 10:29:53 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.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/23384