RFR: 8255557: Decouple GCM from CipherCore [v4]

[Anthony Scarpino]

On Wed, 19 May 2021 23:59:36 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

>> Anthony Scarpino has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix perf problem by reorganizing doLastBlock()
>
> src/java.base/share/classes/com/sun/crypto/provider/GaloisCounterMode.java line 805:
> 
>> 803:         /**
>> 804:          * This segments large data into smaller chunks so hotspot will start
>> 805:          * using CTR and GHASH intrinsics sooner.  This is a problem for app
> 
> nit: typo: CTR->GCTR? This is to improve performance rather than a problem, no? Same comment applies to the other throttleData() method above.

Yes, this is for apps or perf tests that send large input data and cause the hotspot compiler to be slower to start using the intrinsics.. This is just a new version of what was in the old code in doLastBlock() around line 400.

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PR: https://git.openjdk.java.net/jdk/pull/4072