w = 5, two's-complement.
| x | y | x + y | x + y after deal overflow |
|---|---|---|---|
| -12 | -15 | -27 | 5 |
| [10100] | [10001] | [100101] | [00101] |
| -8 | -8 | -16 | -16 |
| [11000] | [11000] | [110000] | [10000] |
| -9 | 8 | -1 | -1 |
| [10111] | [01000] | [11111] | [11111] |
| 2 | 5 | 7 | 7 |
| [00010] | [00101] | [00111] | [00111] |
| 12 | 4 | -16 | -16 |
| [01100] | [00100] | [10000] | [10000] |