GPUs are best under SIMD conditions: single instruction, multiple data. You're talking about running `eval` thousands of times. Each unit of execution is going

GPUs are best under SIMD conditions: single instruction, multiple data. You're talking about running `eval` thousands of times. Each unit of execution is going to have different data, because each process is executing different code (especially when you consider different branches of a conditional statement). So, it wouldn't work that well :-)