Investigation of a Novel Common Subexpression Elimination Method for Low Power and Area Efficient DCT Architecture

Table 3

Selector S1 attributes according to selection Sel1.

Sel1	Operation
	Output 1	Output 2	Output 3	Output 4
00	𝑐1×𝑓(𝑥𝑖,𝑦𝑗)	𝑐3×𝑓(𝑥𝑖,𝑦𝑗)	𝑐5×𝑓(𝑥𝑖,𝑦𝑗)	𝑐7×𝑓(𝑥𝑖,𝑦𝑗)
01	𝑐3×𝑓(𝑥𝑖,𝑦𝑗)	𝑐7×𝑓(𝑥𝑖,𝑦𝑗)	𝑐1×𝑓(𝑥𝑖,𝑦𝑗)	𝑐5×𝑓(𝑥𝑖,𝑦𝑗)
10	𝑐5×𝑓(𝑥𝑖,𝑦𝑗)	𝑐1×𝑓(𝑥𝑖,𝑦𝑗)	𝑐7×𝑓(𝑥𝑖,𝑦𝑗)	𝑐3×𝑓(𝑥𝑖,𝑦𝑗)
11	𝑐7×𝑓(𝑥𝑖,𝑦𝑗)	𝑐5×𝑓(𝑥𝑖,𝑦𝑗)	𝑐3×𝑓(𝑥𝑖,𝑦𝑗)	𝑐1×𝑓(𝑥𝑖,𝑦𝑗)