static single assignment

Question

# of temporary variable required to create 3 address code in static single assignment form for the expression P+Q*R-S/(Q*R).

Comments

2?

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given is 4 but i think it5

Answer 1

Is it 4 ? 

Comments

here q*r is used 2 times rt so why u used same variable ?

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I think it's because in static single assignment you cannot reassign something twice , but you can reuse it again if needed in RHS like t1 . Here you are not reassigning t1 again,  but using it again . Thanks.

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yes true

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@ prathmesh_08 In general Static Single Assignment means for each and every variable and for every computation of the program,we should assign a temporary variable right?

So then total temporary variables should be 8 right?