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Shameless plug: My Rust 6502 emulator used macros for opcode decoding as well. CPU emulation is an ideal use case for Lispy macros: the addressing mode and opcode combinations have a lot of closely related code that's amenable to macro factoring, and having the interpreter, JIT (if present), and disassembler share code is a nice application as well.

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Hi, Patrick! Sprocketnes has been helpful reading as I've worked on my own emulator. Ian Piumarta's lib6502 uses plain C macros. It's even almost as short as cl-6502...though I don't think it's quite as readable. ;)

Keep up the great work on Rust, been waiting on the gc/scheduler stuff to shake out a little bit. Looking forward to 0.8!

LLVM invented the tablegen language to do this in C++.

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