RFR: 8311220: Optimization for StringLatin UpperLower [v5]

[温绍锦]

> # Benchmark Result
> 
> 
> sh make/devkit/createJMHBundle.sh
> bash configure --with-jmh=build/jmh/jars
> make test TEST="micro:java.lang.StringUpperLower.*"
> 
> 
> 
> ## 1. [aliyun_ecs_c8i.xlarge](https://help.aliyun.com/document_detail/25378.html#c8i)
> * cpu : intel xeon sapphire rapids (x64)
> 
> ``` diff
> -Benchmark                      Mode  Cnt   Score   Error  Units (baseline)
> -StringUpperLower.lowerToLower  avgt   15  27.180 ± 0.017  ns/op
> -StringUpperLower.lowerToUpper  avgt   15  47.196 ± 0.066  ns/op
> -StringUpperLower.mixedToLower  avgt   15  32.307 ± 0.072  ns/op
> -StringUpperLower.mixedToUpper  avgt   15  44.005 ± 0.414  ns/op
> -StringUpperLower.upperToLower  avgt   15  32.310 ± 0.033  ns/op
> -StringUpperLower.upperToUpper  avgt   15  42.053 ± 0.341  ns/op
> 
> +Benchmark                      Mode  Cnt   Score   Error  Units (Update 01)
> +StringUpperLower.lowerToLower  avgt   15  16.964 ± 0.021  ns/op (+60.96%)
> +StringUpperLower.lowerToUpper  avgt   15  46.491 ± 0.036  ns/op (+1.51%)
> +StringUpperLower.mixedToLower  avgt   15  35.947 ± 0.254  ns/op (-10.12%)
> +StringUpperLower.mixedToUpper  avgt   15  41.976 ± 0.326  ns/op (+4.83%)
> +StringUpperLower.upperToLower  avgt   15  33.466 ± 4.036  ns/op (-3.45%)
> +StringUpperLower.upperToUpper  avgt   15  17.446 ± 1.036  ns/op (+141.04%)
> 
> +Benchmark                      Mode  Cnt   Score   Error  Units (Update 00)
> +StringUpperLower.lowerToLower  avgt   15  16.976 ± 0.043  ns/op (+60.160)
> +StringUpperLower.lowerToUpper  avgt   15  46.373 ± 0.086  ns/op (+1.77%)
> +StringUpperLower.mixedToLower  avgt   15  32.018 ± 0.061  ns/op (+0.9%)
> +StringUpperLower.mixedToUpper  avgt   15  42.019 ± 0.473  ns/op (+4.72%)
> +StringUpperLower.upperToLower  avgt   15  32.052 ± 0.051  ns/op (+0.8%)
> +StringUpperLower.upperToUpper  avgt   15  16.978 ± 0.190  ns/op (+147.69%)
> 
> 
> ## 2. [aliyun_ecs_c8a.xlarge](https://help.aliyun.com/document_detail/25378.html#c8a)
> * cpu : amd epc genoa (x64)
> 
> ``` diff
> -Benchmark                      Mode  Cnt   Score   Error  Units (baseline)
> -StringUpperLower.lowerToLower  avgt   15  22.164 ± 0.021  ns/op
> -StringUpperLower.lowerToUpper  avgt   15  46.113 ± 0.047  ns/op
> -StringUpperLower.mixedToLower  avgt   15  28.501 ± 0.037  ns/op
> -StringUpperLower.mixedToUpper  avgt   15  38.782 ± 0.038  ns/op
> -StringUpperLower.upperToLower  avgt   15  28.625 ± 0.162  ns/op
> -StringUpperLower.upperToUpper  avgt   15  27.960 ± 0.038  ns/op
> 
> +Benchmark                      Mode  Cnt   Score   Error  Units (Update 01)
> +StringUpperLower.lowerToLo...

温绍锦 has updated the pull request incrementally with one additional commit since the last revision:

  rename isLowerCaseEx to hasNotUpperCaseEx

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14751/files
  - new: https://git.openjdk.org/jdk/pull/14751/files/a5ace579..b4761828

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14751&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14751&range=03-04

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14751.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14751/head:pull/14751

PR: https://git.openjdk.org/jdk/pull/14751