callbench.cpp

#include <cstdio>
#include <cstdlib>
#include "cycle.h"

const short NFUNCS = 24;

template<int N>
int fN(int x) {
	return fN<N-1>(fN<N-1>(x));
}

template<>
int fN<0> (int x) {
	return (x + 23) >> 2;
}

int main (int argc, char *argv[]) {

	int iterations = atoi(argv[1]);

	ticks start = getticks();

	int result = 0;
	int i = iterations;
	while (i --> 0) {
		result += fN<NFUNCS>(i);
	}

	ticks end = getticks();

	double total = elapsed(end, start);
	double percall = total / ( (1 << (NFUNCS+1)) - 1) / iterations;
	printf("total cycles: %.2f, cycles per call: %.2f\n", total, percall);

	return result;
}