Apparatus and method for multiplication and accumulation of complex and real packed data elements

Abstract

An apparatus and method for multiplying packed real and imaginary components of complex numbers. For example, one embodiment of a processor comprises: a decoder to decode a first instruction to generate a decoded instruction; a first source register to store a first plurality of packed real and imaginary data elements; a second source register to store a second plurality of packed real and imaginary data elements; execution circuitry to execute the decoded instruction, the execution circuitry comprising: multiplier circuitry to select real and imaginary data elements in the first source register and second source register to multiply, the multiplier circuitry to multiply each selected imaginary data element in the first source register with a selected real data element in the second source register, and to multiply each selected real data element in the first source register with a selected imaginary data element in the second source register to generate a plurality of imaginary products, adder circuitry to add a first subset of the plurality of imaginary products to generate a first temporary result and to add a second subset of the plurality of imaginary products to generate a second temporary result; accumulation circuitry to combine the first temporary result with first data from a destination register to generate a first final result and to combine the second temporary result with second data from the destination register to generate a second final result and to store the first final result and second final result back in the destination register.