In-line Compilation

In-line or open compilation refers to compile-time expansion of a subprogram, with substitution of arguments, in-line at the point of each call.

Advantages:

• Eliminates overhead of procedure call

• Can eliminate method lookup in an object-oriented system

• Can expose opportunities for optimization across the procedure call:

  
   succ(i + 7)  -->   i + 7 + 1  -->   i + 8
  

• Relative saving is high for small procedures

Disadvantages:

• May increase code size

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