The main reason to adopt a belt is that you don't need to encode the destination (or destinations on an instruction that returns multiple values). Instruction

The main reason to adopt a belt is that you don't need to encode the destination (or destinations on an instruction that returns multiple values). Instruction cache pressure is typically a critical design constraint on VLIW machines which is presumably why they went this route. Also, that simplifies the compilers job and ties into the spiller design, etc.