5.1 Instruction formats In the MIPS instruction formats (Figure 5.4), we can reduce the opcode field from 6 to 5 bits and the function field from 6 to 4 bits. Given the number of MIPS instructions and different functions needed, these changes will not limit the design; that is, we will still have enough operation codes and function codes. The 3 bits thus gained can be used to extend the rs, rt, and rd fields from 5 to 6 bits each. a. List two positive effects of these changes. Justify your answers. b. List two negative effects of these changes. Justify your answers