On Tue, 21 May 2024 09:01:32 GMT, Claes Redestad <redes...@openjdk.org> wrote:
>> 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 moving some seldom used `findStatic` >> calls to a holder. All in all this means a reduction by 22M cycles to >> bootstrap a trivial switch expression on my M1. > > Claes Redestad has updated the pull request incrementally with one additional > commit since the last revision: > > Add type switch to HelloClasslist By adding a trivial type switch to `HelloClasslist` we archive a set of classes and avoid some runtime class generation. This grows the default CDS archive by approximately 1.2Mb by pulling in a large number of Classfile API classes, which is bound to happen soon anyway. On the SwitchSanity test, bootstrap cost drops by another 35M cycles: Wall clock: 51.0 ms/op .taskclock: 63.5 ms/op .cycles: 220064872 average cycles elapsed .instructions: 544981276 average instructions retired ------------- PR Comment: https://git.openjdk.org/jdk/pull/19307#issuecomment-2122136668
