The open corpus of JMH micros is a maven project here: http://hg.openjdk.java.net/code-tools/jmh-jdk-microbenchmarks

On the MethodHandlesGuardWithTest.testInvoke the performance of Graal is about 30% slower than C2 with default flags, on one test system with 12-b15:

C2:
Benchmark                              Mode  Cnt  Score   Error  Units
MethodHandlesGuardWithTest.testInvoke  avgt   10  9.194 ��� 0.095  ns/op
Graal:
MethodHandlesGuardWithTest.testInvoke  avgt   10  11.711 ��� 0.200  ns/op

Here C2 uses the _profileBoolean intrinsic, but C2 also has slightly better performance than Graal even when it is disabled with "-XX:+UnlockDiagnosticVMOptions -XX:DisableIntrinsic=_profileBoolean":

MethodHandlesGuardWithTest.testInvoke  avgt   15  10.268 ��� 0.035  ns/op

We would like to see if the _profileBoolean intrinsic could be adapted to Graal to improve the performance.