RFR: 8256245: AArch64: Implement Base64 decoding intrinsic

[Andrew Haley]

On Mon, 29 Mar 2021 03:15:57 GMT, Nick Gasson <ngasson at openjdk.org> wrote:

> > There's a lot of unrolling, particularly in the non-SIMD case. Please consider taking out some of the unrolling; I suspect it'd not increase time by very much but would greatly reduce the code cache pollution. It's very tempting to unroll everything to make a benchmark run quickly, but we have to take a balanced approach.
> 
> But there's only ever one of these generated at startup, right? It's not like the string intrinsics that are expanded at every call site.

I'm talking about icache pollution. This stuff could be quite small.

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PR: https://git.openjdk.java.net/jdk/pull/3228