Recent advances in very large scale integrated (VLSI) circuit technology have lead to a surge in research aimed at finding new computer organizations that support a great deal of concurrency computer organizations based on tree structures appear well-suited to several kinds of parallel computations. In this paper we will discuss the performance of tree machines as well as Issues related to their implementation in VLSI. Examples of tree machines are presented, with an emphasis on the way the

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... essing elements communicate in the machine. A taxonomy of tree algorithms based on a taxonomy of parallel algorithms proposed by Kung in 1979 is Introduced. Examples of tree algorithms are also given.