1. A method performed by a digital processor for evaluating a complex exponential function for an input value, x, comprising: obtaining one or more complex exponential software instructions having said input value, x, as an input; in response to at least one of said complex exponential software instructions, performing the following steps: invoking at least one complex exponential functional unit that implements said one or more complex exponential software instructions to apply said complex exponential function to said input value, x; and generating an output corresponding to said complex exponential of said input value, x.