Withdrawn: 8340571: Outline code from the loop in ZipFile.Source.initCen

[Claes Redestad]

On Mon, 23 Sep 2024 09:44:57 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> This PR suggests refactoring `ZipFile.Source.initCEN` to move as much logic as possible into the per-entry method processor. This inner method will be called often and JIT optimized earlier in the bootstrap sequence.
> 
> Startup tests using the OpenJDK benchmarks.jar show a ~1ms improvement on both my M1 macbook and my x64 wokstation, while we also improve on relevant throughput microbenchmarks:
> 
> 
> Name               (size) Cnt       Base      Error        Test      Error  Unit  Change
> openCloseZipFile      512  15  61372.449 ± 1197.432   58081.423 ± 1751.988 ns/op   1.06x (p = 0.000*)
> openCloseZipFile     1024  15 117953.727 ± 3202.274  112548.875 ± 5126.665 ns/op   1.05x (p = 0.001*)
> openCloseZipFilex2    512  15  62141.795 ±  674.121   60520.017 ± 2438.346 ns/op   1.03x (p = 0.017 )
> openCloseZipFilex2   1024  15 117959.071 ± 1528.426  111773.937 ± 1604.412 ns/op   1.06x (p = 0.000*)
>   * = significant

This pull request has been closed without being integrated.

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

PR: https://git.openjdk.org/jdk/pull/21133