For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

Microsoft Specific

Reads the CR4 register and returns its value.

unsigned __int64 __readcr4(void);  

The value in the CR4 register.

__readcr4x86, x64

Header file <intrin.h>

This intrinsic is only available in kernel mode, and the routine is only available as an intrinsic.

Compiler Intrinsics