/favor (Optimize for Architecture Specifics)
/favor: option produces the code that is optimized for a specific architecture or for the specifics of micro-architectures in the AMD and the Intel architectures.
Intel64 architecture was previously known as Extended Memory 64 Technology, and the corresponding compiler option was /favor:EM64T.
For information about how to program for the x64 architecture, see x64 Software Conventions.
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.
Select the C/C++ folder.
Select the Command Line property page.
Enter the compiler option in the Additional Options box.
To set this compiler option programmatically