Optimizing C Code

• Level 0 optimization: -o0 flag

  • Performs control-flowgraph simplifications
  • Allocates variables to registers
  • Eliminates unused code
  • Simplifies expressions and statements
  • Expands inline function calls

• Level 1 optimization: -o1 flag

  • Performs local copy/constant propagation
  • Removes unused assignments
  • Eliminates local common expressions

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