I was looking for easy things to do to improve `java.lang.invoke` cold performance. One of the things is inlining `VarForm.getMemberName` a bit, so that interpreter does not have to call through `getMemberNameOrNull`.
There is direct VarHandle benchmark in our corpus: $ CONF=linux-x86_64-server-release make run-test TEST=micro:java.lang.invoke.VarHandleExact MICRO="TIME=200ms;WARMUP_TIME=200ms;VM_OPTIONS=-Xint" Benchmark Mode Cnt Score Error Units # -Xint # Baseline VarHandleExact.exact_exactInvocation avgt 30 714.041 ± 5.882 ns/op VarHandleExact.generic_exactInvocation avgt 30 641.570 ± 11.681 ns/op VarHandleExact.generic_genericInvocation avgt 30 1336.571 ± 11.873 ns/op # -Xint # Patched VarHandleExact.exact_exactInvocation avgt 30 678.495 ± 10.752 ns/op ; +5% VarHandleExact.generic_exactInvocation avgt 30 573.320 ± 5.100 ns/op ; +11% VarHandleExact.generic_genericInvocation avgt 30 1338.593 ± 14.275 ns/op # (server, default) # Baseline VarHandleExact.exact_exactInvocation avgt 30 0.620 ± 0.079 ns/op VarHandleExact.generic_exactInvocation avgt 30 0.602 ± 0.063 ns/op VarHandleExact.generic_genericInvocation avgt 30 10.521 ± 0.065 ns/op # (server, default) # Patched VarHandleExact.exact_exactInvocation avgt 30 0.621 ± 0.070 ns/op VarHandleExact.generic_exactInvocation avgt 30 0.601 ± 0.061 ns/op VarHandleExact.generic_genericInvocation avgt 30 10.499 ± 0.070 ns/op Additional testing: - [x] Linux x86_64 fastdebug `tier1` - [x] Linux x86_64 fastdebug `tier2` - [x] Linux x86_64 fastdebug `tier3` ------------- Commit messages: - Fix Changes: https://git.openjdk.java.net/jdk/pull/7333/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7333&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8281168 Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod Patch: https://git.openjdk.java.net/jdk/pull/7333.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7333/head:pull/7333 PR: https://git.openjdk.java.net/jdk/pull/7333
