AK2-stuff/fibb_tsc/fibb_inline.c

#include <stdio.h>

// Jan Potocki 2020

unsigned long fibb(unsigned long n);

unsigned long long timestamp()
{
    unsigned long long tsc;

    asm volatile(
        "xor %%eax, %%eax\n"
        "cpuid\n"
        "rdtsc"
        : "=A" (tsc)
        :
        : "ebx", "ecx"
    );

    return tsc;
}

int main()
{
    unsigned long term, result;
    unsigned long long tstamp1, tstamp2;

    scanf("%lu", &term);

    tstamp1 = timestamp();
    result = fibb(term);
    tstamp2 = timestamp();

    printf("Result: %lu\n", result);
    printf("Cycles: %llu\n", tstamp2-tstamp1);

    return 0;
}