This paper presents the technique of operator sifting as a new way of understanding both breadth-first and depth-first approaches to BDD construction. A new algorithm is also proposed to capture the breadth-first approach's advantage of memory access locality, while keeping the depth-first approach's advantage of low memory overhead. Our preliminary experimental results show that our approach is generally faster than other implementations that rely exclusively on either breadth-first or depth-first approaches while keeping memory overhead comparable to that of depth-first approaches.

18 pages

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