<i18n dev> RFR: 8337279: Optimize format instant

[Shaojin Wen]

On Fri, 26 Jul 2024 14:20:07 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> By removing the redundant code logic in DateTimeFormatterBuilder$InstantPrinterParser#formatTo, the codeSize can be reduced and the performance can be improved.

By removing redundant code logic, the codeSize can be reduced from 444 to 240, and the performance is improved.

Below are the performance numbers running on MacBook M1 Pro


-# master 5ff7c57f9ff5428ef3d2aedd7e860bb1e8ff29ea
-Benchmark                       Mode  Cnt  Score   Error   Units
-ToStringBench.instantToString  thrpt   15  4.734 ? 0.547  ops/ms +24.10%

+# current baf0f9ca83c111401d6e034dfba0ee2c71280e62
+Benchmark                       Mode  Cnt  Score   Error   Units
+ToStringBench.instantToString  thrpt   15  5.875 ? 0.301  ops/ms

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PR Comment: https://git.openjdk.org/jdk/pull/20353#issuecomment-2252885851