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A Fast Algorithm for finding Dominators in a Flow Graph.

Autore: Thomas Lengauer; Robert Endre Tarjan; STANFORD UNIV CALIF DEPT OF COMPUTER SCIENCE.
Editore: Ft. Belvoir Defense Technical Information Center MAR 1978.
Edizione/Formato:   Libro : EnglishVedi tutte le edizioni e i formati
Banca dati:WorldCat
Sommario:
This paper presents a fast algorithm for finding dominators in a flow graph. The algorithm uses depth-first search and an efficient method of computing functions defined on paths in trees. A simple implementation of the algorithm runs in O(m log n) time, where m is the number of edges and n is the number of vertices in the problem graph. A sophisticated implementation runs in O(M alpha (m, n)) time, where alpha(m,  Per saperne di più…
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Tipo documento: Book
Tutti gli autori / Collaboratori: Thomas Lengauer; Robert Endre Tarjan; STANFORD UNIV CALIF DEPT OF COMPUTER SCIENCE.
Numero OCLC: 227494654
Descrizione: 42 p.

Abstract:

This paper presents a fast algorithm for finding dominators in a flow graph. The algorithm uses depth-first search and an efficient method of computing functions defined on paths in trees. A simple implementation of the algorithm runs in O(m log n) time, where m is the number of edges and n is the number of vertices in the problem graph. A sophisticated implementation runs in O(M alpha (m, n)) time, where alpha(m, n) is a functional inverse of Ackermann's function. Both versions of the algorithm were implemented in Algol W, and tested on an IBM 370/168. The programs were compared with an implementation by Purdom and Moore of a straightforward O(mn) - time algorithm, and with a bit vector algorithm. The fast algorithm beat the straightforward algorithm and the bit vector algorithm on all but the smallest graphs tests.

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