Interesting. So do all those functions have assembly implementations or do some of them have c implementations? I'm assuming the list of functions also changes depending on the architecture?
They are implemented in different ways, depending on the instrinsic.
Many are implemented in the in-memory intermediate SSA (?) representation the JVM uses for its JIT, so they essentially get compiled down to assembly at the same time as the surrounding bytecode.
Some are implemented as jumps to various native methods, which in turn might be implemented in C++ or assembly. Most intrinsics are available on most platforms: only some of the hand-coded assembly versions are less likely to have wide support.
