That's a TTA (https://en.wikipedia.org/wiki/Transport_triggered_architectu... ), where effectively the ALU and other computation units become memory-mapped devices. It's the logical extension of how a lot of microcontrollers which don't have a multiply instruction in their instruction sets, e.g. 8051, will instead have a multiplier unit that's accessed by reading/writing special memory addresses.

That's somewhat different from the move-based code discussed here where the MOVs are actually performing the computation.