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Previous Year Question (PYQs)

Which of the following statements are correct?

  1. The first three-address instruction in the intermediate code is a leader.
  2. The instruction which is exactly at the middle of the given three address code is a leader.
  3. Any instruction that is the target of a conditional or unconditional jump is a leader.
  4. Any instruction that immediately follows a conditional or unconditional jump is a leader.

Choose the correct answer from the options given below:





Solution

In compiler design, leaders are used to form basic blocks.

Rules for finding leaders:

  1. The first instruction of the intermediate code is always a leader.

So, statement $1$ is true.

  1. The middle instruction is not necessarily a leader.

So, statement $2$ is false.

  1. Any instruction which is the target of a conditional or unconditional jump is a leader.

So, statement $3$ is true.

  1. Any instruction immediately following a conditional or unconditional jump is also a leader.

So, statement $4$ is true.

Correct statements are:

$1,3,4$


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