Abstract
An algorithm to solve the “live variables” problem on reducible flow graphs is presented. It is based on the concept of a region of a flow graph. The algorithm is compared for time complexity with the well-known round-robin version of the iterative algorithm on “self-replicating” families of reducible flow graphs. The results of comparison are inconclusive in that the region analysis algorithm requires fewer bit-vector operations on some graphs and more on others.
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