> A few additional enhancements aiming to improve VH performance in the > interpreter: > > - Flatten `TypeAndInvokers`: adds a pointer to `VarHandle` (a small increase > 40->48) but removes an object and an indirection on any instance actually > used - and might avoid allocating the `MethodHandle[]` unnecessarily on some > instances > - Have `checkExactAccessMode` return the directness of the `VarHandle` so > that we can avoid some `isDirect` method calls. > > Baseline, `-Xint` > > Benchmark Mode Cnt Score Error Units > VarHandleExact.exact_exactInvocation avgt 30 478.324 ? 5.762 ns/op > VarHandleExact.generic_exactInvocation avgt 30 392.114 ? 1.644 ns/op > VarHandleExact.generic_genericInvocation avgt 30 822.484 ? 1.865 ns/op > > > Patched, `-Xint` > > Benchmark Mode Cnt Score Error Units > VarHandleExact.exact_exactInvocation avgt 30 437.704 ? 5.320 ns/op > VarHandleExact.generic_exactInvocation avgt 30 374.512 ? 3.154 ns/op > VarHandleExact.generic_genericInvocation avgt 30 757.054 ? 1.237 ns/op > > > No significant performance difference in normal mode.
Claes Redestad has updated the pull request incrementally with one additional commit since the last revision: Simplified as suggested by @ExE-Boss ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/8160/files - new: https://git.openjdk.java.net/jdk/pull/8160/files/49c8fdf8..68f414a1 Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8160&range=01 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8160&range=00-01 Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod Patch: https://git.openjdk.java.net/jdk/pull/8160.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8160/head:pull/8160 PR: https://git.openjdk.java.net/jdk/pull/8160
