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Representations of Two-Variable Elementary Functions Using EVMDDs and their Applications to Function Generators

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2 Author(s)
Shinobu Nagayama ; Dept. of Comput. Eng., Hiroshima City Univ., Hiroshima ; Tsutomu Sasao

This paper proposes a method to represent two-variable elementary functions using edge-valued multi-valued decision diagrams (EVMDDs), and presents a design method and an architecture for function generators using EVMDDs. To show the compactness of EVMDDs, this paper introduces a new class of integer-valued functions, l-restricted Mp-monotone increasing functions, and derives an upper bound on the number of nodes in an edge-valued binary decision diagram (EVBDD) for the l-restricted Mp-monotone increasing function. EVBDDs represent l-restricted Mp- monotone increasing functions more compactly than MTB- DDs and BMDs when p is small. Experimental results show that all the two-variable elementary functions considered in this paper can be converted into l-restricted Mp- monotone increasing functions with p = 1 or p = 3, and can be compactly represented by EVBDDs. Since EVMDDs have shorter paths and smaller memory size than EVBDDs, EVMDDs can produce fast and compact elementary function generators.

Published in:

38th International Symposium on Multiple Valued Logic (ismvl 2008)

Date of Conference:

22-24 May 2008