Apparatus and method for performing transformations of packed complex data with real and imaginary components

摘要

An apparatus and method for performing transformation on complex data. For example, one embodiment of a processor includes: a decoder for decoding a first instruction to generate a decoded instruction; a first source register for storing a first plurality of packed real and imaginary data elements; a second source register for storing a second plurality of packed real and imaginary data elements; a third source register for storing a third plurality of packed real and imaginary data elements; an execution circuit for executing the decoded instruction, the execution circuit comprising: a multiplier circuit for selecting real and imaginary data elements in the first and second source registers to multiply based on an immediate element of the first instruction, the multiplier circuit receiving first packed data items from the first source register multiplied by second packed data elements from the second source register according to the immediate element to produce a plurality of real and imaginary products, an adder circuit for selecting real and imaginary data elements in the third source register based on the immediate element, the adder circuit having selected true and adding and subtracting imaginary values from the real and imaginary products to produce first real and imaginary results; a scaling, rounding and / or saturating circuit for scaling, rounding and / or saturating the first true and imaginary results to produce real and imaginary end data elements; and a destination register for storing the real and imaginary end data items in predetermined data item positions.