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Assertion (A): A constant is usually rematerialised rather than spilled.
Reason (R): Recomputing a constant costs a single instruction while reloading it costs a memory access.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives the mechanism, and the same reasoning extends to simple address computations. Anything whose operands are still available and whose cost is below a load is worth recomputing rather than storing.

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