#include <iostream>
#include <vector>
#include <cstdint>
#include <cstdlib>
using namespace std;
const int SIZE = 1000000;
uint64_t g_val[SIZE];
static __inline__ unsigned long long rdtsc(void)
{
unsigned hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ( (unsigned long long)lo)|( ((unsigned long long)hi)<<32 );
}
int func1(int x)
{
int v[x];
int vmax = 0;
int vmin = x;
for(int i = 0; i < x; i++)
{
v[i] = rand() % x;
if (v[i] > vmax)
vmax = v[i];
if (v[i] < vmin)
vmin = v[i];
}
int avg = (vmax + vmin) / 2;
int count = 0;
for(int i = 0; i < x; i++)
{
if (v[i] > avg)
{
count++;
}
}
return count;
}
int func2(int x)
{
vector<int> v;
v.resize(x);
int vmax = 0;
int vmin = x;
for(int i = 0; i < x; i++)
{
v[i] = rand() % x;
if (v[i] > vmax)
vmax = v[i];
if (v[i] < vmin)
vmin = v[i];
}
int avg = (vmax + vmin) / 2;
int count = 0;
for(int i = 0; i < x; i++)
{
if (v[i] > avg)
{
count++;
}
}
return count;
}
int func3(int x)
{
vector<int> v;
int vmax = 0;
int vmin = x;
for(int i = 0; i < x; i++)
{
v.push_back(rand() % x);
if (v[i] > vmax)
vmax = v[i];
if (v[i] < vmin)
vmin = v[i];
}
int avg = (vmax + vmin) / 2;
int count = 0;
for(int i = 0; i < x; i++)
{
if (v[i] > avg)
{
count++;
}
}
return count;
}
void runbench(int (*f)(int), const char *name)
{
srand(41711211);
uint64_t long t = rdtsc();
int count = 0;
for(int i = 20; i < 200; i++)
{
count += f(i);
}
t = rdtsc() - t;
cout << "count = " << count << endl;
cout << name << " time in clocks per iteration " << dec << t << endl;
}
#define BM(name) void bench_##name() { runbench(name, #name); }
BM(func1);
BM(func2);
struct function
{
voidint (*func)(voidint);
const char *name;
};
#define FUNC(f) { bench_##ff, #f }
function funcs[] =
{
FUNC(func1),
FUNC(func2),
FUNC(func3),
};
int main()
{
for(size_t i = 0; i < sizeof(funcs)/sizeof(funcs[0]); i++)
{
runbench(funcs[i].func(, funcs[i].name);
}
}
