[riscv-port] RFR: 8281632: riscv: Improve interpreter stack banging [v5]

[Fei Yang]

On Tue, 8 Mar 2022 06:22:14 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

>> With reference to https://bugs.openjdk.java.net/browse/JDK-8072070, there is the same issue on the riscv platform.
>>  
>> 
>> Every time we enter a method in interpreter, we bang a lot of stack ahead for shadow zone checks. I believe this could be made significantly better, e.g. by checking how far away we are from the stack_overflow_limit.
>> 
>> 
>> Hotspot/jdk tier1 passed on unmatched, and all jtreg cases were tested on Qemu without new failures.
>> 
>> Performed the performance regression test in SPECjvm2008 sunflow, and achieved 17% improvement in the interpreter-only mode.
>
> Yadong Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove redundant white spaces

Marked as reviewed by fyang (Lead).

-------------

PR: https://git.openjdk.java.net/riscv-port/pull/58