Abstract—Variable latency adders have been recently proposed in literature. A variable latency adder employs speculation: the exact arithmetic function is replaced with an approximated one that is faster and gives the correct result most of the time, but not always. The approximated adder is augmented with an error

detection network that asserts an error signal when speculation



fails. Speculative variable latency adders have attracted strong



interest thanks to their capability to reduce average delay com-

pared to traditional architectures.