[jdk17u-dev] RFR: 8268276: Base64 Decoding optimization for x86 using AVX-512

Tue Nov 8 01:25:46 UTC 2022

This is a backport of JDK-8268276: Base64 Decoding optimization for x86 using AVX-512.  Backport is clean.

We have had numerous customer requests for this functionality to be backported due to the ~19x performance improvement.

There will be two additional PRs for which this is a dependency.  I will add the PR numbers when available.

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

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

Commit messages:
 - Backport c37988d0793b24d98d285530dfda69999a227937

Changes: https://git.openjdk.org/jdk17u-dev/pull/860/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=860&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8268276
  Stats: 753 lines in 12 files changed: 735 ins; 4 del; 14 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/860.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/860/head:pull/860

PR: https://git.openjdk.org/jdk17u-dev/pull/860