Improving programs by the introduction of recursion

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Abstract
A new technique of program transformation, called “recursion introduction,” is described and applied to two algorithms which solve pattern matching problems. By using recursion introduction, algorithms which manipulate a stack are first translated into recursive algorithms in which no stack operations occur. These algorithms are then subjected to a second transformation, a method of recursion elimination called “tabulation,” to produce programs with a very efficient running time. In particular, it is shown how the fast linear pattern matching algorithm of Knuth, Morris, and Pratt can be derived in a few steps from a simple nonlinear stack algorithm.

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