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We already know what the main remaining issue is - LLVM-MOS's register allocator is far from optimal for the 6502 architecture. mysterymath is slowly working on what may become a more sutiable allocator.

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There is a video below of mysterymath presenting LLVM-MOS where he talks about reserving 32 bytes of zero page to present to LLVM as 16 16-bit registers, to be able to utilize it's register allocator, which does seem a sane approach.

https://www.youtube.com/watch?v=ejbTKtgSZI0

However his github doesn't show any activity on it in the last 2 years.

https://github.com/mysterymath/llvm-mos

Lol? https://github.com/mysterymath/llvm-mos/tree/regalloc

My bad - was just looking at the main branch.

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