[jdk17u-dev] RFR: 8269404: Base64 Encoding optimization enhancements for x86 using AVX-512

[Scott Gibbons]

On Tue, 8 Nov 2022 01:56:55 GMT, Scott Gibbons <duke at openjdk.org> wrote:

> This is a backport of JDK-8269404: Base64 Encoding optimization enhancements for x86 using AVX-512. Backport is clean.
> 
> We have had numerous customer requests for this functionality to be backported due to the performance improvement.
> 
> There will be three additional PRs for which this is a dependency. This PR is dependent on PR #860.
> 
> Risk: I view the risk of this backport to be minimal. This code has been in use for many months with no bugs reported.
> 
> Testing: x86_64 build, affected tests, tier1
> 
> Thanks,
> --Scott

Thanks, Goetz.  The failure is in TestStringDeduplicationTools and is caused by improper 64-byte alignment of data structures.  This bug was found and fixed with the subsequent PR (#862).  The bug will show up sporadically and depends on the stub code generation process.

Please let me know how I should handle this.

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PR: https://git.openjdk.org/jdk17u-dev/pull/861