RFR: 8256245: AArch64: Implement Base64 decoding intrinsic [v6]

[Andrew Haley]

On Wed, 7 Apr 2021 09:50:45 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Dong Bo has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix misleading annotations
>
> src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp line 5829:
> 
>> 5827:     __ strb(r14, __ post(dst, 1));
>> 5828:     __ strb(r15, __ post(dst, 1));
>> 5829:     __ strb(r13, __ post(dst, 1));
> 
> I think this sequence should be 4 BFMs, STRW, BFM, STRW. That's the best we can do, I think.

Sorry, that's not quite right, but you get the idea: let's not generate unnecessary memory traffic.

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