Scheduling expressions on a pipelined processor with a maximal delay of one cycle

  • Authors:
  • David Bernstein;Izidor Gertner

  • Affiliations:
  • IBM T. J. Watson Research Center, Yorktown Heights, NY;The Graduate School, CUNY, NY

  • Venue:
  • ACM Transactions on Programming Languages and Systems (TOPLAS)
  • Year:
  • 1989

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Abstract

Consider a pipelined machine that can issue instructions every machine cycle. Sometimes, an instruction that uses the result of the instruction preceding it in a pipe must be delayed to ensure that a program computes a right value. We assume that issuing of such instructions is delayed by at most one machine cycle. For such a machine model, given an unbounded number of machine registers and memory locations, an algorithm to find a shortest schedule of the given expression is presented and analyzed. The proposed algorithm is a modification of Coffman-Graham's algorithm [7], which provides an optimal solution to the problem of scheduling tasks on two parallel processors.