Apparatus and method for acceleration of effective subtraction procedures by the approximation of the absolute value of the exponent argumentdifference
CA 1294055 C · Owner: Digital Equipment Corporation · Inventors: Peng, Victor; Gronowski, Paul E.; Gavrielov, Nachum M.
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The arithmetic operations performed for floating point format numbers involve procedures having a multiplicity of major steps. In the performance of the effective subtraction operation, the determination of absolute value of the difference between the operand exponent arguments must be obtained in order to determine the correct procedure. In the present invention a difference between a, subset of the operand exponent arguments is calculated and the result of this calculation is used to anticipate the correct procedure. By careful selection of the anticipated correct procedure when, the selection is erroneous, the correct result is immediately available. The availability of the correct …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
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- Granted January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 2009.
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