With an adder circuit where A+B=C, I am trying to have a method to determine when C will be valid based on a change in A or B.  I know that it is possible to just determine the longest the circuit would take, but is it possible to determine if the result (C) is equal to A+B.  This would speed up the result of the operation as if A and B had a small change, C could be determined faster than a full adder cycle.In general:  If you know A, B, and C, can you determine if A+B=C faster than adding A+B
Is it possible to determine if C=A+B faster than adding A+B in logical circuits
circuits;digital circuits