Speculation can enhance adders performance by making carry predictions. It consists in replacing the arithmetic function with a faster, approximated, one, giving correct results most of the time. An error detection stage flags the misprediction events, in such cases, a two-cycles error correction stage is used, constituting a variable latency speculative adder. This paper proposes novel variable latency speculative adders based on Han-Carlson parallel-prefix topologies. The proposed adders are more effective than variable latency Kogge-Stone adders previously proposed in literature. A novel error detection technique that reduces error probability, compared to previous approaches, is proposed. Synthesis results, in the UMC 65nm library, show that proposed variable latency topologies outperform previously developed speculative Kogge-Stone adders and non-speculative ones, when high-speed is required. It is also shown that non-speculative adders remain the best choice when the speed constraint is relaxed.

Variable latency speculative Han-Carlson adders topologies / Esposito, Darjn; DE CARO, Davide; DE MARTINO, Michele; Strollo, ANTONIO GIUSEPPE MARIA. - (2015), pp. 45-48. (Intervento presentato al convegno 11th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2015 tenutosi a Glasgow nel 2015) [10.1109/PRIME.2015.7251090].

Variable latency speculative Han-Carlson adders topologies

ESPOSITO, DARJN;DE CARO, Davide;DE MARTINO, MICHELE;STROLLO, ANTONIO GIUSEPPE MARIA
2015

Abstract

Speculation can enhance adders performance by making carry predictions. It consists in replacing the arithmetic function with a faster, approximated, one, giving correct results most of the time. An error detection stage flags the misprediction events, in such cases, a two-cycles error correction stage is used, constituting a variable latency speculative adder. This paper proposes novel variable latency speculative adders based on Han-Carlson parallel-prefix topologies. The proposed adders are more effective than variable latency Kogge-Stone adders previously proposed in literature. A novel error detection technique that reduces error probability, compared to previous approaches, is proposed. Synthesis results, in the UMC 65nm library, show that proposed variable latency topologies outperform previously developed speculative Kogge-Stone adders and non-speculative ones, when high-speed is required. It is also shown that non-speculative adders remain the best choice when the speed constraint is relaxed.
2015
9781479982295
Variable latency speculative Han-Carlson adders topologies / Esposito, Darjn; DE CARO, Davide; DE MARTINO, Michele; Strollo, ANTONIO GIUSEPPE MARIA. - (2015), pp. 45-48. (Intervento presentato al convegno 11th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2015 tenutosi a Glasgow nel 2015) [10.1109/PRIME.2015.7251090].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/637720
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