Scalar fused multiply-add instructions produce floating-point matrix arithmetic provably accurate to the penultimate digit

  • Authors:
  • Yves Nievergelt

  • Affiliations:
  • Eastern Washington University, Cheney, WA

  • Venue:
  • ACM Transactions on Mathematical Software (TOMS)
  • Year:
  • 2003

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Abstract

Combined with doubly compensated summation, scalar fused multiply-add instructions redefine the concept of floating-point arithmetic, because they allow for the computation of sums of real or complex matrix products accurate to the penultimate digit. Particular cases include complex arithmetic, dot products, cross products, residuals of linear systems, determinants of small matrices, discriminants of quadratic, cubic, or quartic equations, and polynomials.