... = instr[9:7];
register_file reg_file(.clk(clk),.rst(reset),.reg_write_en(reg_write),
.reg_write_dest(reg_write_dest),
.reg_write_data(reg_write_data),
.reg_read_addr_1(reg_read_addr_1),
.reg_read_data_1(reg_read_data_1),
...
