Ken Shirriff on Nostr: Adding on a computer is trickier than you'd expect. The Pentium processor (1993) used ...

Adding on a computer is trickier than you'd expect. The Pentium processor (1993) used a variety of circuits for addition. I reverse-engineered an adder in the floating point unit and found that it is a "Kogge-Stone carry-lookahead adder", using some tricks to make it faster. Let's look inside. 1/n