Sign Extension
Turning an n-bit representation into one with more bits
- Eg, in 3 bits the number -3 is 101
- In 4 bits the number -3 is 1101
Replicate the sign bit from the smaller word into all extra slots of larger word
- For 5-bit word from 3 bits: 11101 = -3
- For 5-bit word from 4 bits: 11101 = -3