register allocation

Which ONE of the following techniques used in compiler code optimization uses live variable analysis?

The program below uses six temporary variables a, b, c, d, e, f. a = 1 b = 10 c = 20 d = a + b e = c + d f = c + e b = c + e e = b + f d = 5 + e return d + f Assuming that all oper...

Consider the grammar rule $$E \to {E_1} - {E_2}$$ for arithmetic expressions. The code generated is targeted to a CPU having a single user register. The subtraction operation requi...