RFR: 8339738: RISC-V: Vectorize crc32 intrinsic [v6]

[Hamlin Li]

> Hi,
> Can you help to review this patch?
> Thanks.
> 
> This improvement is based on java.base/share/native/libzip/zlib/zcrc32.c, I made some modification to N (to 16) related code, then re-generate the tables needed, finally vectorize the code (original implementation in zcrc32.c is just scalar code).
> 
> ## Test
> test/hotspot/jtreg/compiler/intrinsics/zip/TestCRC32.java, 
> test/jdk/java/util/zip/TestCRC32.java
> 
> ## Performance
> 
> ### on bananapi
> 
> with patch
> <google-sheets-html-origin style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
> Benchmark | (count) | Mode | Cnt | Score | Error | Units
> -- | -- | -- | -- | -- | -- | --
> TestCRC32.testCRC32Update | 64 | avgt | 10 | 222.297 | 0.106 | ns/op
> TestCRC32.testCRC32Update | 128 | avgt | 10 | 365.144 | 0.196 | ns/op
> TestCRC32.testCRC32Update | 256 | avgt | 10 | 687.14 | 0.235 | ns/op
> TestCRC32.testCRC32Update | 512 | avgt | 10 | 1043.833 | 0.083 | ns/op
> TestCRC32.testCRC32Update | 2048 | avgt | 10 | 3299.928 | 1.361 | ns/op
> TestCRC32.testCRC32Update | 16384 | avgt | 10 | 24384.502 | 25.298 | ns/op
> TestCRC32.testCRC32Update | 65536 | avgt | 10 | 103200.458 | 8.297 | ns/op
> 
> </google-sheets-html-origin>
> 
> without patch
> <google-sheets-html-origin style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
> Benchmark | (count) | Mode | Cnt | Score | Error | Units
> -- | -- | -- | -- | -- | -- | --
> TestCRC32.testCRC32Update | 64 | avgt | 10 | 220.878 | 0.02 | ns/op
> TestCRC32.testCRC32Update | 128 | avgt | 10 | 364.173 | 0.032 | ns/op
> TestCRC32.testCRC32Update | 256 | avgt | 10 | 685.815 | 0.055 | ns/op
> TestCRC32.testCRC32Update | 512 | avgt | 10 | 1329.049 | 0.084 | ns/op
> TestCRC32.testCRC32Update | 2048 | avgt | 10 | 5189.302 | 0.666 | ns/op
> TestCRC32.testCRC32Update | 16384 | avgt | 10 | 41250.873 | 23.882 | ns/op
> TestCRC32.testCRC32Update | 65536 | avgt | 10 | 171664.002 | 15.011 | ns/op
> 
> </google-sheets-html-origin>
> 
> ### on K230
> 
> with patch
> <google-sheets-html-origin style="caret-color: rgb(0, 0, ...

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  remove redundant jump

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20910/files
  - new: https://git.openjdk.org/jdk/pull/20910/files/b9e7cc14..22b880ef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20910&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20910&range=04-05

  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20910.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20910/head:pull/20910

PR: https://git.openjdk.org/jdk/pull/20910