This switch expression in `Locale::createLocale` is causing a somewhat large
startup regression on my local system. Desugaring to if statements seem like
the right thing to do while we investigate ways to further reduce overheads in
`SwitchBootstraps`.
These numbers are against a baseline which include #18865 and #18845, which
already improved the situation:
Name Cnt Base Error Test Error
Unit Change
Perfstartup-Noop 20 40,500 ± 1,942 31,000 ± 2,673
ms/op 1,31x (p = 0,000*)
:.cycles 143254849,000 ± 3398321,355 102205427,650 ± 2192784,853
cycles 0,71x (p = 0,000*)
:.instructions 307138448,850 ± 2095834,550 219415574,800 ± 376992,067
instructions 0,71x (p = 0,000*)
:.taskclock 39,500 ± 1,942 22,500 ± 3,858
ms 0,57x (p = 0,000*)
* = significant
Comparing to a baseline without those recent improvements the overhead was
almost the double:
Name Cnt Base Error Test Error
Unit Change
Perfstartup-Noop 20 50,000 ± 0,000 31,000 ± 2,673
ms/op 1,61x (p = 0,000*)
:.cycles 187047932,000 ± 3330400,381 102205427,650 ± 2192784,853
cycles 0,55x (p = 0,000*)
:.instructions 408219060,350 ± 4031173,140 219415574,800 ± 376992,067
instructions 0,54x (p = 0,000*)
:.taskclock 53,500 ± 4,249 22,500 ± 3,858
ms 0,42x (p = 0,000*)
* = significant
-------------
Commit messages:
- Merge branch 'master' into deswitch
- Desugar switch in Locale::createLocale
Changes: https://git.openjdk.org/jdk/pull/18882/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18882&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8330802
Stats: 7 lines in 1 file changed: 2 ins; 0 del; 5 mod
Patch: https://git.openjdk.org/jdk/pull/18882.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/18882/head:pull/18882
PR: https://git.openjdk.org/jdk/pull/18882
