c++visual-c++x86-64intrinsicsmemory-segmentation

Identifier "__readgsqword" is undefined - Visual Studio 2017

I'm trying to read memory using the __readgsqword function in Visual Studio 2017 and I get an error saying that identifier __readgsqword is undefined even though I have already included intrin.h.

#include "stdafx.h"
#include <intrin.h>

int main()
{
    __readgsqword(88);
    return 0;
}

I don't understand why it says undefined even though it is defined inside of intrin.h

Solution

  • It's only available in x64 mode. If you haven't changed the CPU architecture in the solution, it won't be available.