RFR: 8355699: RISC-V: support SUADD/SADD/SUSUB/SSUB [v2]

[Hamlin Li]

> Hi,
> Can you help to review this patch to add SUADD/SADD/SUSUB/SSUB for vector api?
> 
> Thanks!
> 
> ## Test
> data
> <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 | (size) | Mode | Cnt | Score - master | Score - patch | improvement (master/patch)
> -- | -- | -- | -- | -- | -- | --
> ByteMaxVector.SADD | 1024 | avgt | 10 | 23693.941 | 381.441 | 62.117
> ByteMaxVector.SSUB | 1024 | avgt | 10 | 24067.009 | 379.836 | 63.362
> ByteMaxVector.SUADD | 1024 | avgt | 10 | 24131.819 | 382.678 | 63.06
> ByteMaxVector.SUSUB | 1024 | avgt | 10 | 23140.494 | 380.768 | 60.773
> IntMaxVector.SADD | 1024 | avgt | 10 | 88526.058 | 1378.77 | 64.207
> IntMaxVector.SSUB | 1024 | avgt | 10 | 94204.768 | 1383.613 | 68.086
> IntMaxVector.SUADD | 1024 | avgt | 10 | 82470.743 | 1384.668 | 59.56
> IntMaxVector.SUSUB | 1024 | avgt | 10 | 84443.805 | 1759.69 | 47.988
> LongMaxVector.SADD | 1024 | avgt | 10 | 187690.117 | 3770.84 | 49.774
> LongMaxVector.SSUB | 1024 | avgt | 10 | 187334.716 | 3814.869 | 49.106
> LongMaxVector.SUADD | 1024 | avgt | 10 | 186891.578 | 2747.753 | 68.016
> LongMaxVector.SUSUB | 1024 | avgt | 10 | 186092.582 | 2730.588 | 68.151
> ShortMaxVector.SADD | 1024 | avgt | 10 | 43991.814 | 726.703 | 60.536
> ShortMaxVector.SSUB | 1024 | avgt | 10 | 40560.356 | 730.238 | 55.544
> ShortMaxVector.SUADD | 1024 | avgt | 10 | 43349.632 | 729.758 | 59.403
> ShortMaxVector.SUSUB | 1024 | avgt | 10 | 42686.701 | 726.059 | 58.792
> 
> </google-sheets-html-origin>

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

  minor

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25005/files
  - new: https://git.openjdk.org/jdk/pull/25005/files/7648da04..466eb06c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25005&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25005&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25005.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25005/head:pull/25005

PR: https://git.openjdk.org/jdk/pull/25005