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Reflective case for Class::isInstance(Object) is backed by Runtime1::is_instance_of() which uses oopDesc::is_a() to do the job. Consider improving the implementation based on backend functionality introduced by JDK-8331341. hotspot/src/share/vm/c1/c1_LIRGenerator.cpp: // Example: clazz.isInstance(object) void LIRGenerator::do_isInstance(Intrinsic* x) { ... // TODO could try to substitute this node with an equivalent InstanceOf // if clazz is known to be a constant Class. This will pick up newly found // constants after HIR construction. I'll leave this to a future change. // as a first cut, make a simple leaf call to runtime to stay platform independent. // could follow the aastore example in a future change.