[jdk17u-dev] RFR: 8268276: Base64 Decoding optimization for x86 using AVX-512 [v3]
Scott Gibbons
duke at openjdk.org
Mon Oct 31 20:26:26 UTC 2022
> This is a backport of JDK-8268276: Base64 Decoding optimization for x86 using AVX-512.
>
> We have had numerous customer requests for this functionality to be backported due to the ~19x performance improvement.
>
> Original patch does not apply cleanly to 17u, because of a bug that was identified in the original commit, but not fixed until the later Base64 Encode acceleration enhancement was complete. The fix is on line 6039 of src/hotspot/cpu/x86/stubGenerator_x86_64.cpp and has been included in this PR. All four "translatedX" registers needed to be checked for illegal characters in the input stream.
>
> 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, tier2
>
> Thanks,
> --Scott
Scott Gibbons has updated the pull request incrementally with two additional commits since the last revision:
- Merge branch 'Decode-backport' of https://github.com/asgibbons/jdk17u-dev into Decode-backport
- Hand-merging bugfix 9a1bbaf8db0e869ab76be8ab1bd0ddeb23693e7e
-------------
Changes:
- all: https://git.openjdk.org/jdk17u-dev/pull/840/files
- new: https://git.openjdk.org/jdk17u-dev/pull/840/files/2fc2c571..dbf7ed14
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=840&range=02
- incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=840&range=01-02
Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
Patch: https://git.openjdk.org/jdk17u-dev/pull/840.diff
Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/840/head:pull/840
PR: https://git.openjdk.org/jdk17u-dev/pull/840
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