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Just like the `REP STOS` instruction, this removes a fairly nasty bit of code generation from our dispatcher. This instruction behaves like a memcpy/memmove when not dealing with the faulting behaviour around the instruction. With a microbench things improves this instruction's throughput by 3.5% to 25.5% depending on operating size. There is a TODO for implementing this instruction with ARM's future MOPS instructions which will accelerate this implementation further.