We can fold the call to `Objects.checkIndex` into the code generated in generateTypeSwitchSkeleton instead of doing so by filtering the MH argument. This loads 9 less classes (of which 8 generated LFs and Species classes) on a minimal test, while being neutral on a throughput sanity test:
Name Cnt Base Error Test Error Unit Change SwitchSanity.switchSum 15 8,162 ± 0,117 8,152 ± 0,131 ns/op 1,00x (p = 0,800 ) * = significant ``` A few additional optimizations includes generating the switch method using the precise type (to avoid the need for an explicitCast adaptation), and moving some seldom used `findStatic` calls to a holder. All in all this means a reduction by 33-34M cycles to bootstrap a trivial switch expression on my M1. ------------- Commit messages: - Remove explicitCastArguments and refactor - Move rarely used findStatics to Holder class - Drive-by desugaring - Move Objects.checkIndex call to code generated by generateTypeSwitch Changes: https://git.openjdk.org/jdk/pull/19307/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19307&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8332528 Stats: 157 lines in 4 files changed: 113 ins; 18 del; 26 mod Patch: https://git.openjdk.org/jdk/pull/19307.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19307/head:pull/19307 PR: https://git.openjdk.org/jdk/pull/19307
