Q10

MCQ1 mark, −0.25

Consider the grammar rule $E \rightarrow E1 – E2$ for arithmetic expressions. The code generated is targeted to a CPU having a single user register. The subtraction operation requires the first operand to be in the register. If $E1$ and $E2$ do not have any common sub expression, in order to get the shortest possible code

(A)

$E1$ should be evaluated first

(B)

$E2$ should be evaluated first

(C)

Evaluation of $E1$ and $E2$ should necessarily be interleaved

(D)

Order of evaluation of $E1$ and $E2$ is of no consequence

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