Abstract: A method of an aspect includes receiving a dot product instruction. The dot product instruction indicates a first source packed data including at least four data elements, indicates a second source packed data including at least eight data elements, and indicates a destination storage location. A result packed data is stored in the destination storage location in response to the dot product instruction. The result includes a plurality of data elements that each includes a dot product result. Each of the dot product results includes a sum of products of the at least four data elements of the first source packed data with corresponding data elements in a different subset of at least four data elements of the second source packed data. Other methods, apparatus, systems, and instructions are disclosed.