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

[Tyler Steele]

On Thu, 7 Apr 2022 14:21:47 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.
>
> Once again:
> With only s390 files in the changeset, there is no way for this PR to fail linux x86 tests.

@RealLucy Tier1 tests in progress :slightly_smiling_face:. I will update this comment when they complete

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