I wish the documentation gave more details about the whole conversion process. I'm guessing that the RISC core gets optimized by dropping instructions that are

I wish the documentation gave more details about the whole conversion process. I'm guessing that the RISC core gets optimized by dropping instructions that aren't needed for a particular C program. But does it have some kind of heuristic to determine whether or not to drop an instructions based on how often it's used? Or is it just a greedy "If the C compiler generates instruction A, then add instruction A to the CPU" decision?