The /O options control various optimizations that help you create code for maximum speed or minimum size.
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/O2 optimizes code for maximum speed. 爲獲得最高速度而優化代碼。
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/Ob controls inline function expansion. 控制內聯函數展開。
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/Od disables optimization, speeding compilation and simplifying debugging. 禁用優化，從而加快編譯並簡化調試。
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/Og enables global optimizations. 啓用全局優化。
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/Oi generates intrinsic functions for appropriate function calls. 爲適當的函數調用生成內部函數。
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/Os tells the compiler to favor optimizations for size over optimizations for speed. 通知編譯器優選大小優化而非速度優化。
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/Ot (a default setting) tells the compiler to favor optimizations for speed over optimizations for size. （默認設置）通知編譯器優選速度優化而非大小優化。
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/Ox selects full optimization. 選擇完全優化。
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/Oy suppresses the creation of frame pointers on the call stack for quicker function calls. 取消在調用堆棧上創建框架指針，以更快地進行函數調用。