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 operations take their operands from registers, what is the minimum number of registers needed to execute this program without spilling?

The program below uses six temporary variables a, b, c, d, e, f.

1.	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 operations take their operands from registers, what is the minimum number of registers needed to execute this program without spilling?
A.	2
B.	3
C.	4
D.	6
Answer» C. 4

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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 operations take their operands from registers, what is the minimum number of registers needed to execute this program without spilling?

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