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发明公开
CN109144570A 具有带有复数指数非线性函数的指令集的数字处理器 审中-实审

具有带有复数指数非线性函数的指令集的数字处理器
摘要：
提供了一种数字处理器，其包括具有复数指数函数的指令集。该数字处理器针对输入值x通过以下操作求复数指数函数的值：获取复数指数软件指令，以输入值x的作为输入，并且响应于该复数指数软件指令：调用至少一个复数指数函数单元，所述复数指数函数单元实施复数指数软件指令以将复数指数函数应用于输入值x；并且生成对应于输入值x的复数指数的输出。输入值x的复数指数函数可通过以下操作来求解：约束该输入值以保持给定的范围；利用查找表计算粗略近似角度；调整所述粗略近似角度以获取从0到θ的角度；以及利用多项式近似计算精确校正值。
摘要（英）：

A digital processor is provided having an instruction set with a complex exponential function. The digital processor evaluates a complex exponential function for an input value, x, by obtaining a complex exponential software instruction having the input value, x, as an input; and in response to the complex exponential software instruction: invoking at least one complex exponential functional unitthat implements complex exponential software instructions to apply the complex exponential function to the input value, x; and generating an output corresponding to the complex exponential of the input value, x. A complex exponential function for an input value, x, can be evaluated by wrapping the input value to maintain a given range; computing a coarse approximation angle using a look-up table;scaling the coarse approximation angle to obtain an angle from 0 to theta; and computing a fine corrective value using a polynomial approximation.

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