second matrix.
2. Multiply each element in the row by each element in the column, and sum
with the current value of the result matrix element (multiply-add-accumulate).
-Store result in the first row, first column entry.
+Store result in the row matching first operand row and column matching second
+operand column.
3. Move to the next column of the second matrix, and next column of the result
matrix. If there are no more columns in the second matrix, go back to first
column (second matrix), and move to next row (first and result matrices).