RFR: 8256245: AArch64: Implement Base64 decoding intrinsic

[Nick Gasson]

On Sat, 27 Mar 2021 09:53:37 GMT, Andrew Haley <aph 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.

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