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Communications of the ACM

Communications of the ACM

Systematic recursion removal

The recursion removal algorithm presented by Strong and Walker is amplified and applied to a relatively complex PL/I program. The aim is to demonstrate systematic recursion-removal techniques on something more complex than Knuth's “sturdy toddler” and to obtain measurements of the cost of procedure linkage in PL/I and the savings achievable via procedure integration in the presence of recursion. First, the paper describes the recursion-removal process and the example on which it will be illustrated. Recursion removal is then applied to the two major parts of this example and the final result of the process is displayed. Our performance comparison results are presented, and our conclusions are briefly discussed

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