GATE CS 2015 Set-1,Q50:A variable x is said to be live at a statement Si in a program if the

Описание: GATE CS 2015 Set-1,Q50:A variable x is said to be live at a statement Si in a program if the following three conditions hold simultaneously:
I. There exists a statement Sj that uses x
II. There is a path from Si to Sj in the flow graph corresponding to the program
III. The path has no intervening assignment to x including at Si and Sj
The variables which are live both at the statement in basic block 2 and at the statement in basic block 3 of the above control flow graph are
(A) p, s, u (B) r, s, u
(C) r, u (D) q, v
Ans : (C) r, u
Ch 3.33:Live-Variable Analysis    • Ch 3.33:Live-Variable Analysis |Liveness A...  
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