RFR: 8258588: MD5 MessageDigest in java.util.UUID should be cached

[PROgrm_JARvis]

On Thu, 7 Jan 2021 17:09:14 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> Hi Claes,
>> Would flattening the state of MD5 bring any further improvements?
>> https://github.com/plevart/jdk/commit/92bf48ff58f0ce9648e49466dbf1befebbf49083
>
>> Hi Claes,
>> Would flattening the state of MD5 bring any further improvements?
>> [plevart at 92bf48f](https://github.com/plevart/jdk/commit/92bf48ff58f0ce9648e49466dbf1befebbf49083)
> 
> I think it might, marginally, but it seemed to me that the implCompress0 MD5 intrinsic is using `state` so I've not tried that yet since rewriting and checking the intrinsic code is a lot of work. (I've blogged about my experiments in this area and mentioned this issue in passing: https://cl4es.github.io/2021/01/04/Investigating-MD5-Overheads.html#accidental-constraints)

> 
> 
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PR: https://git.openjdk.java.net/jdk/pull/1821