Alibaba and start-up Biren Technology are tweaking their most advanced chip designs to reduce processing speeds and avoid US-imposed sanctions aimed at suppressing Chinese computing power.

Alibaba, Biren, and other Chinese design houses have spent years and millions of dollars creating the blueprints for advanced processors to power the country’s next generation of supercomputers, artificial intelligence algorithms and data centers. These are produced offshore by the world’s biggest contract chipmaker, Taiwan Semiconductor Manufacturing.

But sanctions announced by Washington last month that cap the processing power of any semiconductor shipped into China without a license have thrown a wrench into their ambitions.