Define three-address code.

• Three-address code is a sequence of statements of the general form

                           x := y op z
where x, y and z are names, constants, or compiler generated temporaries; op stands for any operator, such as  fixed or floating-point arithmetic operator, or a logical operator on boolean-valued data.

• Three-address code is a linearized representation of a syntax tree or a dag in which explicit names correspond to the interior nodes of the graph.