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Conference Papers Year : 2008

An Efficient Method for Evaluating Polynomial and Rational Function Approximations

Abstract

In this paper we extend the domain of applicability of the E-method, as a hardware-oriented method for evaluating elementary functions using polynomial and rational function approximations. The polynomials and rational functions are computed by solving a system of linear equations using digit-serial iterations on simple and highly regular hardware. For convergence, these systems must be diagonally dominant. The E-method offers an efficient way for the fixed-point evaluation of polynomials and rational functions if their coefficients conform to the diagonal dominance condition. Until now, there was no systematic approach to obtain good approximations to f over an interval [a,b] by rational functions satisfying the constraints required by the E-method. In this paper, we present such an approach which is based on linear programming and lattice basis reduction. We also discuss a design and performance characteristics of a corresponding implementation.
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Dates and versions

hal-00761652 , version 1 (05-12-2012)

Identifiers

  • HAL Id : hal-00761652 , version 1

Cite

Nicolas Brisebarre, Sylvain Chevillard, Milos Ercegovac, Jean-Michel Muller, Serge Torres. An Efficient Method for Evaluating Polynomial and Rational Function Approximations. ASAP 08, Jul 2008, Leuven, Belgium. pp.233 -- 238. ⟨hal-00761652⟩
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