Consider the program below which uses
six temporary variables a, b, c, d, e, and f.
a = 10
b = 20
c = 30
d=a+c
f=c+c
b=c+e
e=b+f
d=5+e
return d+f
Assuming that all the above operations take their operands from registers, the minimum number of registers needed to execute this program without spilling is
Assuming that all the above operations
take their operands from registers, the minimum number of registers needed to execute
this program without spilling is