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/O Options (Optimize Code)

The /O options control various optimizations that help you create code for maximum speed or minimum size.

  • /O1 optimizes code for minimum size.
  • /O2 optimizes code for maximum speed.
  • /Oa tells the compiler to assume your program does not use aliasing.
  • /Ob controls inline function expansion.
  • /Od disables optimization, speeding compilation and simplifying debugging.
  • /Og enables global optimizations.
  • /Oi generates intrinsic functions for appropriate function calls.
  • /Op disables optimizations that could change the precision of floating-point numbers.
  • /Os tells the compiler to favor optimizations for size over optimizations for speed.
  • /Ot (a default setting) tells the compiler to favor optimizations for speed over optimizations for size.
  • /Ow tells the compiler that your program does not use aliasing within functions but may use aliasing across functions calls.
  • /Ox selects full optimization.
  • /Oy suppresses the creation of frame pointers on the call stack for quicker function calls.

See Also

Compiler Options | Setting Compiler Options

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