2022 EuroLLVM Dev Mtg “LLVM-MOS 6502 Backend: Having a Blast in the Past”
2022 EuroLLVM Developers' Meeting
https://llvm.org/devmtg/2022-05/
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LLVM-MOS 6502 Backend: Having a Blast in the Past - Daniel Thornburgh, Google
Slides: https://llvm.org/devmtg/2022-05/slide...
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LLVM-MOS is an out-of-tree Clang and LLVM backend for the MOS Technology 6502, the CPU behind the NES, Atari 2600/8-bit, BBC Micro, Commodore 64, and many more beloved devices. LLVM-MOS converts freestanding C/C++ into fairly efficient 6502 machine code, despite the 6502’s limited and heterogeneous registers, lack of stack-relative addressing modes, and 256-byte stack. This talk will explore the grab-bag of tricks that hoodwinked LLVM into supporting an almost 50-year-old architecture: "imaginary" registers, instruction set regularization, whole-program static stack allocation, and, of course, lots and lots of pseudo-instructions.
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Videos Edited by Bash Films: http://www.BashFilms.com