RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v3]

[Vladimir Kozlov]

On Tue, 22 Mar 2022 11:50:13 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> This PR implements JEP 422: Linux/RISC-V Port [1].
>> The PR starts as a squashed merge of the https://openjdk.java.net/projects/riscv-port branch.
>> 
>> This has been tested with jtreg tier{1,2,3,4} and jcstress on HiFive Unmatched board. Dacapo, SPECjbb2015 and SPECjvm2008 benchmark tests are also carried out regularly. So it should be good enough to run most Java programs.
>> 
>> [1] https://openjdk.java.net/jeps/422
>
> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

I looked on C1/C2 changes and compiler tests. Seems reasonable.
But before approval I would need to run changes through our testing.

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PR: https://git.openjdk.java.net/jdk/pull/6294