Consider the following expression

u*v+a-b*c

Which one of the following corresponds to a static single assignment from the above expressions
(A) x₁ = a – b
y₁ = p * c
x₂ = u * v
y₂ = p + q
(B) x ₁ = a – b
y₁ = x₂ * c
x₃ = u * v
y₂ = x₄ + y₃
(C) x₁ = a – b
y₂ = x₁ * c
x₂ = u * v
y₃ = x₂ + y₂
(D) p = a – b
q = p * c
p = u * v
q = p + q


Answer: (C)

Explanation: According to Static Single Assignment

1. A variable cannot be used more than once in the LHS.
2. A variable should be initialized atmost once.

So, only option (C) is correct.

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