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Dolphin's JITs have a minor terminology problem: The term "fastmem" can refer to either the system of switching between a fast path and a slow path using backpatching, or to the fast path itself. To hopefully make things clearer, I'm adding some new terms, defining the old and new terms as follows: Fastmem: The system of switching from a fast path to a slow path by backpatching when an invalid memory access occurs. Fast access: A code path that accesses guest memory without calling C++ code. Slow access: A code path that accesses guest memory by calling C++ code.