IDK about LLMs there either.

A non-LLM monte carlo AI approach: "Pushing the Limits of Machine Design: Automated CPU Design with AI" (2023) https://arxiv.org/abs/2306.12456 .. https://news.ycombinator.com/item?id=36565671

A useful target for whichever approach is most efficient at IP-feasible design:

From https://news.ycombinator.com/item?id=41322134 :

> "Ask HN: How much would it cost to build a RISC CPU out of carbon?" (2024) https://news.ycombinator.com/item?id=41153490