Processors like these do not even run OpenCL or CUDA, they execute computational graphs devoid of conventional control flow. The Adapteva Epiphany or the Rex N

Processors like these do not even run OpenCL or CUDA, they execute computational graphs devoid of conventional control flow. The Adapteva Epiphany or the Rex Neo is probably closer to what you're looking for. However, once you ask for anything that handles control flow well, you pretty much end back up at the general purpose CPU, which is highly inefficient for a reason. For example, even your GPU today will become very inefficient with control flow due to branch divergence.