System and method for performing an intra-add operation

A method comprising:

• accessing data representative of a first three-dimensional image;
• altering said data to generate a second three-dimensional image, said altering comprising:
• accessing a first packed data operand having N data elements N being a positive integer;
• and
• adding horizontally the N data elements in the first packed data operand to produce a horizontal sum packed data operand having N identical result elements, each result element being equal to sum of the N data elements.

A method comprising

• accessing data representative of a first three-dimensional object;
• altering said data to generate a second three-dimensional object, said altering comprising:
• accessing a vector as a vector packed data operand having N vector data elements, N being a positive integer,
• for each row of a matrix,
• accessing the row as a row packed data operand having N row data elements,
• multiplying respective elements of the row and vector packed operands to generate a first packed data operand and
• adding horizontally the N data elements in the first packed data operand to produce a horizontal sum packed data operand having N identical result elements each result element, being equal to sum of the N data elements.