VR/STORE RP, R1+R1'
         RP, R1+R1', d_size
         RP, R1+R1', d_size, p_p_inc_dec-3
         RP, R1+R1', d_size, p_p_inc_dec-3, write_through-1
         RP, R1+R1', d_size, p_p_inc_dec-3, write_through-1, R2 or p_immediate
         RP, R1+R1', d_size, p_p_inc_dec-3, write_through-1, R2 or p_immediate, R3 or shift_immediate


