What is basic block in the graph representation of intermediate codes.

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Module 4 : Intermediate Code Generation & Code Improvement

20227m

What is basic block in the graph representation of intermediate codes. Construct DAG for the basic block given below. Also optimize the three address code, assuming only $a$ is live on exit from the block.
$d = b * c$
$e = a + b$
$b = b * c$
$a = e - d$

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