Implementation of floating-point trigonometric functions in an integrated circuit device

A method for computing a trigonometric function of a first floating-point number in an integrated circuit, comprising:

• receiving the first floating-point number at an input port of an approximation circuit;
• using an extraction circuit in the approximation circuit to generate first and second fixed-point numbers and a second floating-point number based on the first floating-point number;
• retrieving from first and second storage circuits in the approximation circuit, that both store predetermined floating-point numbers of output values of the trigonometric function, third and fourth floating-point numbers of the predetermined floating-point numbers based on the first and second fixed-point numbers, respectively;
• and
• using arithmetic circuitry in the approximation circuit to perform floating-point arithmetic operations on the second, third, and fourth floating-point numbers to generate a fifth floating-point number as an approximation of the trigonometric function of the first floating-point number.

A non-transitory machine-readable storage medium encoded with instructions for configuring circuitry to compute a trigonometric function of a first floating-point number, wherein the circuitry comprises a first storage circuit, an approximation circuit, and a selection circuit coupled to the storage circuit and the approximation circuit, and wherein the approximation circuit comprises an extraction circuit, second and third storage circuits, and arithmetic circuitry, the instructions comprising:

• instructions to configure the extraction circuit to generate first and second fixed-point numbers and a second floating-point number based on the first floating-point number;
• instructions to configure the second and third storage circuits, that both store predetermined floating-point numbers of output values of the trigonometric function, to output third and fourth floating-point numbers of the predetermined floating-point numbers based on the first and second fixed-point numbers, respectively;
• and
• instructions to configure the arithmetic circuitry to perform floating-point arithmetic operations on the second, third, and fourth floating-point numbers to generate a fifth floating-point number as an approximation of the trigonometric function of the first floating-point number.