RFR: 8278757: [s390] Implement AES Counter Mode Intrinsic [v8]

[Lutz Schmidt]

On Mon, 25 Apr 2022 08:05:06 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

>> Please review (and approve, if possible) this pull request.
>> 
>> This is a s390-only enhancement. It introduces the implementation of an AES-CTR intrinsic, making use of the specific s390 instruction for AES counter-mode encryption.
>> 
>> Testing: SAP does no longer maintain a full build and test environment for s390. Testing is therefore limited to running some test suites (SPECjbb*, SPECjvm*) manually. But: identical code is contained in SAP's commercial product and thoroughly tested in that context. No issues were uncovered.
>> 
>> @backwaterred Could you please conduct some "official" testing for this PR? 
>> 
>> Thank you all!
>> 
>> Note: some performance figures can be found in the JBS ticket.
>
> Lutz Schmidt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8278757: more helpful block comments and code cleanup

MacOS tier1 test failures are not a factor for a s390-only change.
Private testing revealed no issues. No performance impact of recent changes.
@backwaterred could you please re-run tier1 tests on linuxs390x with the latest changes included? Thank you!

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PR: https://git.openjdk.java.net/jdk/pull/8142