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You can enable SSE, SSE2, etc as compiler option and parts of code that is written with SSE, SSE2 instructions. Add -DENABLE_SSE=ON, -DENABLE_SSE2=ON, etc to command line to enable hand made SSEx code. It must enable SSE support in compiler automatically. Also you can check, that SSEx is enabled in Visual Studio in Project properties -> C++ -> Instruction set option.