This document discusses intrinsic methods in the HotSpot JVM. It provides background on what intrinsic methods are and how they are implemented and optimized in JVMs and native compilers. It gives examples of intrinsic methods in HotSpot VM like System.currentTimeMillis(), Unsafe.compareAndSwapInt(), and Math.log(). It also discusses intrinsic methods added in TaobaoJDK like TCrc32 and how to experiment implementing your own intrinsic methods in the C1 and C2 compilers.