open-source-search-engine/testfloats.cpp

// Matt Wells, copyright Jan 2002

//#include "gb-include.h"
#include <sys/time.h>  // gettimeofday() 
#include <stdio.h>

long long gettod ( ) {
	struct timeval tv;
	gettimeofday ( &tv , 0 );
	long long now=(long long)(tv.tv_usec/1000)+((long long)tv.tv_sec)*1000;
	return now;
}

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

	float x=  0.4598;
	float y = 13.4567;

	printf("start float loop\n");
	float z;
	long long start = gettod();
	for ( long i = 0 ; i < 10000000 ; i++ ) 
		z = x * y;
	long long end = gettod();
	printf("float muls took %llims\n",end-start);

	long xi = 14598;
	long yi = 134567;
	long zi;
	start = gettod();
	for ( long i = 0 ; i < 10000000 ; i++ ) 
		zi = xi * yi;
	end = gettod();
	printf("int muls took %llims\n",end-start);




	start = gettod();
	for ( long i = 0 ; i < 10000000 ; i++ ) 
		z = x + y;
	end = gettod();
	printf("float adds took %llims\n",end-start);


	start = gettod();
	for ( long i = 0 ; i < 10000000 ; i++ ) 
		zi = xi + yi;
	end = gettod();
	printf("int adds took %llims\n",end-start);


	start = gettod();
	for ( long i = 0 ; i < 10000000 ; i++ ) 
		z = x / y;
	end = gettod();
	printf("float divs took %llims\n",end-start);


	start = gettod();
	for ( long i = 0 ; i < 10000000 ; i++ ) 
		zi = xi / yi;
	end = gettod();
	printf("int divs took %llims\n",end-start);



	return 0;
}