Advanced Micro Devices Corporation

Yun-Xiao Zou

Brian Laird Sumner

Christopher L Spencer

A method and apparatus for additive range reduction are disclosed. A constant may be pre-stored in a look-up table (LUT), and at least one section of the constant may be retrieved from the LUT for generating a product of an input argument and the constant such that a precision of the product may be controlled in any granularity. For a trigonometric function, 2/&#x3c0; is stored in the LUT, and at least one section of 2/&#x3c0; may be retrieved from the LUT. The argument is multiplied with the retrieved sections of 2/&#x3c0;. The retrieved sections are determined to correctly generate the two least significant bits (LSBs) of an integer portion and a scalable number of most significant bits of the multiplication result. An output of the trigonometric function is generated for the argument with a fractional portion of the multiplication result based on two LSBs of the integer portion of the multiplication result.

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Shanghai, China

Yun-Xiao Zou