def fowardingunit(rs1, rs2, ex_mem_rd, mem_wb_rd, ex_mem_regwrite,
                  mem_wb_regwrite):
    if rs1 != 0 and rs1 == ex_mem_rd and ex_mem_regwrite:
        forward_a = '01'
    elif rs1 != 0 and rs1 == mem_wb_rd and mem_wb_regwrite:
        forward_a = '10'
    else:
        forward_a = '00'
    if rs2 != 0 and rs2 == ex_mem_rd and ex_mem_regwrite:
        forward_b = '01'
    elif rs2 != 0 and rs2 == mem_wb_rd and mem_wb_regwrite:
        forward_b = '10'
    else:
        forward_b = '00'
    return forward_a, forward_b