Optimizing C Code

• Level 2 optimization: -o2 flag

  • Performs loop optimizations
  • Eliminates global common sub-expressions
  • Eliminates global unused assignments
  • Performs loop unrolling

• Level 3 optimization: -o3 flag

  • Removes all functions that are never called
  • Performs file-level optimization
  • Simplifies functions with unused return values

• Program-level optimization: -pm flag

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