C program to check if the machine supports the RDTSCP instruction

rdtscp_check.c

#include <cpuid.h>
#include <stdio.h>

int main() {
    unsigned a, b, c, d;
    if (__get_cpuid(0x80000001, &a, &b, &c, &d) && (d & (1<<27)))
    {
        printf("RDTSCP is supported\n");
    }
    else
    {
        printf("RDTSCP is NOT supported\n");
    }

    return 0;
}