RFR: 8256431: [PPC64] Implement Base64 encodeBlock() for Power64-LE [v4]

[Corey Ashford]

On Sat, 12 Dec 2020 09:14:54 GMT, Corey Ashford <github.com+51754783+CoreyAshford at openjdk.org> wrote:

>> Right, we could use much shorter code for loading the constants. I don't think readability would suffer if you only put constants of the same kind (like the base64_... ones) into single arrays. And even if you put all constants into one array I guess it could be made readable by good comments. But there may be a trade-off.
>
> Ok, I will definitely give this a go.  If it looks maintainable, I'll do it.  The loads aren't inside the loop, but still it would be nice especially for calls to the encoder that have a short buffer.

I have pushed changes for this issue.  Take a look and see if you agree that what I did is acceptable, especially with respect to the hard-coded offsets.  I'd be interested to hear If you have a better idea about to maintain them.

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PR: https://git.openjdk.java.net/jdk/pull/1245