Exploring the energy efficiency of multispeculative adders

Alberto A. Del Barrio, Román Hermida, Seda O. Memik

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Variable Latency Adders are attracting strong interest for increasing performance at a low cost. However, most of the literature is focused on achieving a good area-delay tradeoff. In this paper we consider multispeculation as an alternative for designing adders with low energy consumption, while offering better performance than the corresponding non-speculative ones. Instead of introducing more logic to accelerate the computation, the adder is split into several fragments which operate in parallel, and whose carry-in signals are provided by predictor units. On the one hand, the critical path of the module is shortened, and on the other hand the frequent useless glitches produced in the carry propagation structure are diminished. Hence, this will be translated into an overall energy reduction. Several experiments have been performed with linear and logarithmic adders, and results show energy savings by up to 90% and 70%, respectively, while achieving an additional execution time decrease. Futhermore, when utilized in whole datapaths with current control techniques, it is possible to reduce execution time by 24.5% (34% best case) and energy by 32% (48% best case) on average.

Original languageEnglish (US)
Title of host publication2013 IEEE 31st International Conference on Computer Design, ICCD 2013
PublisherIEEE Computer Society
Pages309-315
Number of pages7
ISBN (Print)9781479929870
DOIs
StatePublished - 2013
Event2013 IEEE 31st International Conference on Computer Design, ICCD 2013 - Asheville, NC, United States
Duration: Oct 6 2013Oct 9 2013

Publication series

Name2013 IEEE 31st International Conference on Computer Design, ICCD 2013

Other

Other2013 IEEE 31st International Conference on Computer Design, ICCD 2013
CountryUnited States
CityAsheville, NC
Period10/6/1310/9/13

Keywords

  • Energy reduction
  • Variable Latency Functional Units
  • dynamic power

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Hardware and Architecture

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