According to an aspect, a digital signal processor obtains a program instruction, selects a first real valued input or a second real valued input as a given real valued input (the first and second real valued inputs organized as adjacent elements of a first input vector), depending on an instruction type. The processor performs an arithmetic operation on the selected real valued input to provide a real valued result, and provides a first real valued output and a second real valued output during a first operation cycle (organized as adjacent elements of a second output vector).The real valued result is provided as the first real valued output and as the second real valued output, depending on the instruction type, and the second output vector is a real valued second output vector for real-complex multiplication with a complex valued third vector.