On one hand, the abbreviations are extra mental work. On the other hand, when you start composing fairly complicated chains together, all those extra letters are also extra mental work. Neither is inherently right, but I do prefer something like the former here (just making up something emulatorish):

    mw(cpu.r[0], mr(mr(cpu.r[1])));

    memory_write(processor.register[0], memory_read(memory_read(processor.register[1])));