Wurster Hall, and multiplying 2's complement numbers

[nibot]

Nick gave me a short tour of Wurster Hall. What a cool place! Must explore further...

Brandon sent me the following algorithm to multiply two's complement numbers. I needed to invoke Kenny to help decipher it!

1. Use regular unsigned multiplication to compute A*B → H:L.
2. If A<0, set H ← (H - B).
3. If B<0, set H ← (H - A).

Comments

[forvrkate.livejournal.com]

Two's complement numbers? Whassat?