Optimizing for Time (/O, /Ot)

C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)

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     When you do not use any of the /O options, the CL command
     automatically optimizes for program execution speed. The /O and
     /Ot options have the same effect as this default.
 
     Wherever the compiler has a choice between producing smaller (but
     perhaps slower) or larger (but perhaps faster) code, the compiler
     generates faster code. For example, when you specify the /Ot
     option, the compiler generates either library calls to the
     operating system or inline code to perform shift operations on
     long operands.
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