spectre_project/measure/clock_measure.c

/*
 * not usable clock() isn't precise enough
 *
 *
 */
#include<stdio.h>
#include <stdint.h>
#include<time.h>
#include<stdlib.h>

void usage_and_exit();

int main(int argc, char* argv[]) {
	if(argc != 4) usage_and_exit();

	uint64_t t0, t1;
	int a, b;
	sscanf(argv[2], "%d", &a);
	sscanf(argv[3], "%d", &b);
	if(argv[1][0] == 'd') {
		double out;
		t0 = (uint64_t) clock();
		out = (double) a / b;
		t1 = (uint64_t) clock();
		printf("out = %lf\n", out);
	} else if(argv[1][0] == 'f') {
		float out;
		t0 = (uint64_t) clock();
		out = (float) a / b;
		t1 = (uint64_t) clock();
		printf("out = %f\n", out);
	} else if(argv[1][0] == 'i') {
		int out;
		t0 = (uint64_t) clock();
		out = a / b;
		t1 = (uint64_t) clock();
		printf("out = %d\n", out);
	} else {
		usage_and_exit();
	}
	printf("clocks = %lu\n", t1 - t0);
}
void usage_and_exit() {
	printf("<prog> <i|f|d> <a> <b>\n");
	printf("i = integer\n");
	printf("f = float\n");
	printf("d = double\n");
	exit(1);
}