Abstract: A computer implemented method of multiplying two wide-word integer values, the method comprising: multiplying two or more limbs of a first integer value with two or more limbs of a second integer value to create one or more partial products; summing one or more partial products of a same radix value resulting in one or more partial sums, wherein the one or more partial sums are stored in a target vector register; indicating by an additional operand, opcode, immediate or another register, which of the one or more partial products participate in forming the one or more partial sums; performing all of the above steps by a single instruction in a computer hardware circuit.