Issue No. 07 - July (1986 vol. 35)
C.S. Raghavendra , Department of Electrical Engineering?Systems, University of Southern California
Performing permutations of data on SIMD computers efficiently is important for high-speed execution of parallel algorithms. In this correspondence we consider realizing permutations such as perfect shuffle, matrix transpose, bit-reversal, the class of bit-permute- complement (BPC), the class of Omega, and inverse Omega permutations on N = 2n processors with Illiac IV-type interconnection network, where each processor is connected to processors at distances of ? 1 and ? N. The minimum number of data transfer operations required for realizing any of these permutations on such a network is shown to be 2(N - 1). We provide a general three-phase strategy for realizing permutations and derive routing algorithms for performing perfect shuffle, Omega, Inverse Omega, bit reversal, and matrix-transpose permutations in 2(N - 1) steps. Our approach is quite simple, and unlike previous approaches, makes efficient use of the topology of the Illiac IV-type network to realize these permutations using the optimum number of data transfers. Our strategy is quite powerful: any permutation can be realized using this strategy in 3(N - 1) steps.
SIMD computers, Bit-permute-complement permutations, interconnection network, Omega permutations, parallel algorithms, permutations
V. Prasanna Kumar and C. Raghavendra, "Permutations on Illiac IV-Type Networks," in IEEE Transactions on Computers, vol. 35, no. , pp. 662-669, 1986.