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Methods for implementing arithmetic functions with user-defined input and output formats

  • US 9,811,503 B1
  • Filed: 01/28/2015
  • Issued: 11/07/2017
  • Est. Priority Date: 01/28/2015
  • Status: Active Grant
First Claim
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1. Circuitry configured to implement a function, comprising:

  • a generic approximation circuit that generates output values for the function;

    memory for storing a table of pre-computed output values for the function, wherein the function comprises a fixed-point arithmetic function having an input range, and wherein the pre-computed output values in the table correspond to input values within the input range for which the generic approximation circuit is incapable of generating sufficiently accurate output values; and

    a multiplexing circuit that receives the output values from the generic approximation circuit, that receives the pre-computed output values in the table, and that is configured to route output values from a selected one of the generic approximation circuit and the table to a multiplexer output.

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