RFR: 8293770: RISC-V: Reuse runtime call trampolines [v2]

[Feilong Jiang]

On Thu, 15 Sep 2022 02:42:53 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

>> Follow up [JDK-8280152](https://bugs.openjdk.org/browse/JDK-8280152), this case also exists in riscv.
>> 
>> Benchmark als, chi-square, dec-tree, log-regression, naive-bayes, page-rank, fj-kmeans, reactors, future-genetic, mnemonics, dotty, scala-kmeans, and finagle-http in Renaissance (0.14.1) are tested. The sum of the used size of CodeHeap 'non-profiled nmethods' and CodeHeap 'profiled nmethods' shows ~2.1% reduction on average.
>> 
>> ## Testing:
>> 
>> - hotspot and jdk tier1 on unmatched board without new failures
>> - hotspot/jtreg/compiler/sharedstubs/SharedTrampolineTest.java with fastdebug on qemu
>> 
>> 
>> ## Results
>> #### Results from [Renaissance 0.14.1](https://github.com/renaissance-benchmarks/renaissance/releases/tag/v0.14.1)
>> 
>> - riscv64
>> 
>> +--------------------------------------------------------------------------------------------------------+
>> |                |                     Before                |                    After                  |
>> |    Benchmark   |---------------------------------------------------------------------------------------| 
>> |                | non-profiled nmethods | profiled nmethods | non-profiled nmethods | profiled nmethods |
>> +----------------+-----------------------+-------------------+-----------------------+-------------------| 
>> | als            |                 15628 |             39421 |                 12341 |             26681 |
>> | chi-square     |                  6349 |             20268 |                  6033 |             20252 |
>> | dec-tree       |                 11058 |             42443 |                 10774 |             43880 |
>> | log-regression |                 10939 |             38237 |                 12071 |             44199 |
>> | naive-bayes    |                  9023 |             29563 |                  9294 |             30948 |
>> | page-rank      |                  6054 |             17041 |                  5812 |             17353 |
>> | fj-kmeans      |                   692 |              2893 |                   651 |              3354 |
>> | reactors       |                  2126 |              4073 |                  1876 |              4106 |
>> | future-genetic |                  1306 |              4118 |                  1226 |              4142 |
>> | mnemonics      |                   726 |              2659 |                   706 |              2684 |
>> | dotty          |                 26059 |             24417 |                 24585 |             25379 |
>> | scala-kmeans   |                   564 |              3122 |                   543 |              3132 |
>> | finagle-http   |                  6188 |             12455 |                  6102 |             12295 |
>> | sum            |                 96712 |            240710 |                 92014 |            238405 |
>> +--------------------------------------------------------------------------------------------------------+
>
> Dingli Zhang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Simplify targe related jal call in macroAssembler_riscv.cpp

Copyright of codeBuffer_riscv.hpp should be update to 2022.

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

PR: https://git.openjdk.org/jdk/pull/10260