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-O Options (Optimize Code) | Microsoft Docs |
09/25/2017 |
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The /O options control various optimizations that help you create code for maximum speed or minimum size.
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/O1 sets a combination of optimizations that generate minimum size code.
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/O2 sets a combination of optimizations that optimizes code for maximum speed.
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/Ob controls inline function expansion.
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/Od disables optimization, to speed compilation and simplify debugging.
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/Og enables global optimizations.
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/Oi generates intrinsic functions for appropriate function calls.
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/Os tells the compiler to favor optimizations for size over optimizations for speed.
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/Ot (a default setting) tells the compiler to favor optimizations for speed over optimizations for size.
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/Ox is a combination option that selects several of the optimizations with an emphasis on speed. It is a strict subset of the /O2 optimizations.
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/Oy suppresses the creation of frame pointers on the call stack for quicker function calls.
You can combine multiple /O options into a single option statement. For example, /Odi is the same as /Od /Oi. Certain options are mutually exclusive and cause a compiler error if used together. See the individual /O options for more information.