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Simulator is written internally in Nim. There isn't really a good FOSS IR for RTL sims on the market currently. I absolutely refuse to use MLIR or anything based on LLVM for that matter. LLVM takes up to 40 minutes to rebuild on my Apple silicon. This is completely unacceptable in terms of rapid iteration.

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LLHD is greenfield code, so it’s not based on LLVM. I’m familiar with the authors both academically (15 years ago), and on an engineering level (now). I think it is definitely worth reviewing what they’re bringing to the table.

Anyways, I think the RTL market is ripe for disruption. There was a lot of great language work done by, for instance, Ronald Garcia, directly aimed at fixing pain points in HDLs, like parsmetrization.

Nim really had fantastic potential for RTL and other hardware interaction languages. Best of luck in making progress with the RTL! I’d be really interested if it could become something for program CPLD or FPGA included in some microcontrollers now.

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