Accessing raw CPUID information is actually very easy, here is a C++ class for that which works in Windows, Linux and OSX: #ifndef CPUID_H #define CPUID_H #ifdef _WIN32 #include <limits.h> #include <intrin.h> typedef unsigned __int32 uint32_t; #else #include <stdint.h> #endif class CPUID { uint32_t regs[4]; public: explicit CPUID(unsigned i) { #ifdef _WIN32 __cpuid((int *)regs, (int)i); … Read more
I’m fairly certain you’re being blocked by DEP. The x_CPUIDy_INSNS byte arrays are in a segment of memory marked as data and non-executable. EDIT: That being said, I’ve gotten a version that compiles and runs, but I don’t think gets the right values. Perhaps this will get you along your way. EDIT 2: I think … Read more
After some digging I have found a useful built-in functions that is gcc specific. The only problem is that this kind of functions are really limited ( basically you have only 2 functions, 1 for the CPU “name” and 1 for the set of registers ) an example is #include <stdio.h> int main() { if … Read more
I’ve created a GitHub repro that will detect CPU and OS support for all the major x86 ISA extensions: https://github.com/Mysticial/FeatureDetector Here’s a shorter version: First you need to access the CPUID instruction: #ifdef _WIN32 // Windows #define cpuid(info, x) __cpuidex(info, x, 0) #else // GCC Intrinsics #include <cpuid.h> void cpuid(int info[4], int InfoType){ __cpuid_count(InfoType, 0, … Read more