Best “ordering” for floating-point addition

  • Authors:
  • T. G. Robertazzi;S. C. Schwartz

  • Affiliations:
  • State Univ. of New York at Stony Brook, Stony Brook;Princeton Univ., Princeton, NJ

  • Venue:
  • ACM Transactions on Mathematical Software (TOMS)
  • Year:
  • 1988

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Abstract

This correspondence examines the influence of the summation order on the numerical accuracy of the resulting sum when the addition is performed using floating-point, finite-precision arithmetic. A simple statistical model is used to find the relative performance of various addition procedures. It is shown that phrasing the question in terms of finding a best ordering is overly restrictive since the most natural and accurate procedures for performing the addition utilize the storage of intermediate sums as well as performing orderings.