There’s a growing need for CPUs that can live life on the edge. That is, computing for a long time embedded in hard-to-get-to places and surviving on battery power or energy they can scrounge from the environment. Frustrated with inherent inefficiencies in the architecture of ultralow-power microprocessors, the founders of startup Efficient Computer decided to reinvent the general-purpose processor from the ground up for energy efficiency. “We’re doing something that has the capability of...