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Comments on "Evaluation of A+B = K conditions without carry propagation

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1 Author(s)
B. Parhami ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA

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.<>

Published in:

IEEE Transactions on Computers  (Volume:43 ,  Issue: 3 )