https://www.ecfr.gov/current/title-15/subtitle-B/chapter-VII... https://www.federalregister.gov/documents/2006/04/24/06-3647...
You'll probably have to dig quite a bit to find the latest rules and regulations.
These regulations go back to at least the Export Control Act of 1968. Every CPU/GPU maker would have a legal team that understands these rules.