RFR: 8300493: Use ArraysSupport.vectorizedHashCode in j.u.zip.ZipCoder [v2]

[Lance Andersen]

On Fri, 20 Jan 2023 12:19:50 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> `ZipCoder::checkedHashCode` emulates `StringLatin1::hashCode` but operates on a `byte[]` subrange. It can profitably use the recently introduced `ArraysSupport::vectorizedHashCode` method to see a speed-up, which translates to a small but significant speed-up on `ZipFile` creation.
>> 
>> Before:
>> 
>> Benchmark                     (size)  Mode  Cnt       Score      Error  Units
>> ZipFileOpen.openCloseZipFile     512  avgt   15   83007.325 ± 1446.716  ns/op
>> ZipFileOpen.openCloseZipFile    1024  avgt   15  154550.631 ± 2166.673  ns/op
>> 
>> After:
>> 
>> Benchmark                     (size)  Mode  Cnt       Score      Error  Units
>> ZipFileOpen.openCloseZipFile     512  avgt   15   79512.902 ±  814.449  ns/op
>> ZipFileOpen.openCloseZipFile    1024  avgt   15  147892.522 ± 2744.017  ns/op
>
> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Vary dir and entry name lengths across a wider spread, keeping most entries short but making the longest paths longer

Thank you Claes

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Marked as reviewed by lancea (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12077