Title :
Comments on "Evaluation of A+B = K conditions without carry propagation
Author :
Parhami, Behrooz
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
fDate :
3/1/1994 12:00:00 AM
Abstract :
A special carry-free circuit for the evaluation of conditions of the type A+B=K is proposed by Cortadella and Llaberia (1992), and its usefulness for reducing the negative effects of conditional branches in pipelined architectures is noted. It is shown that the same advantages are offered by another equally simple circuit based on carry-save redundant numbers and (3, 2)-counters. This alternative circuit has other potential applications and much of it may in fact be already present in some ALU´s.<>
Keywords :
logic circuits; pipeline processing; (3, 2)-counters; A+B=K; addition; carry propagation; carry-free circuit; carry-save numbers; carry-save redundant numbers; comparators; conditional branches; negative effects; parallel counters; pipelined architectures; redundant number representation; Adders; Circuit testing; Counting circuits; Delay; Digital arithmetic; Hardware; Logic circuits; Performance evaluation;
Journal_Title :
Computers, IEEE Transactions on
