I'd actually like the llvm-mos to do an automated AoS to SoA analysis and rewrite, but haven't gotten around to it yet. There aren't any intrinsic theoretical obstacles I'm aware of though; it's just difficult code to write.

Now that this has come up again as the stock reason "you can't do C well on the 6502", replacing the stack, the zero page, and the register set, I'm probably going to reprioritize it and put the register allocator on pause.