RFR: 8256245: AArch64: Implement Base64 decoding intrinsic

[Andrew Haley]

On Mon, 29 Mar 2021 03:28:54 GMT, Dong Bo <dongbo at openjdk.org> wrote:

> I think I can rewrite this part as loops.
> With an intial implemention, we can have almost half of the code size reduced (1312B -> 748B). Sounds OK to you?

Sounds great, but I'm still somewhat concerned that the non-SIMD case only offers 3-12% performance gain. Make it just 748 bytes, and therefore not icache-hostile, then perhaps the balance of risk and reward is justified.

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