The IBM system/360 model 91: floating-point execution unit

  • Authors:
  • S. F. Anderson;J. G. Earle;R. E. Goldschmidt;D. M. Powers

  • Affiliations:
  • Systems Development Division, Poughkeepsie, New York;Systems Development Division, Poughkeepsie, New York;Systems Development Division, Poughkeepsie, New York;Systems Development Division, Poughkeepsie, New York

  • Venue:
  • IBM Journal of Research and Development
  • Year:
  • 1967

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Abstract

The principal requirement for the Model 91 floating-point execution unit was that it be designed to support the instructionissuing rate of the processor. The chosen solution was to develop separate, instruction-oriented algorithms for the add, multiply, and divide functions. Linked together by the floating-point instruction unit, the multiple execution units provide concurrent instruction execution at the burst rate of one instruction per cycle.