Floating divisions terribly slow on Intel I5 & E5 xeon processors

#include <iostream>
#include <time.h>	//clock(), time_t
#pragma warning(disable:4996) //disable deprecateds
using namespace std;


time_t start,stop;char null_char='\0';
//Use empty timer() to reset start time:
void timer(char *title=&null_char,int data_size=1){    	stop=clock();	if (*title) cout<<title<< " time ="<<(double) (stop-start)/(double) CLOCKS_PER_SEC<< " = " << 1e-6*data_size/( (double)(stop-start)/(double)CLOCKS_PER_SEC ) <<  " Mops/seg"   <<endl; 	start=clock(); }


int main()
{
	cout << "Perform test in Release mode. Results will be wrong in debug mode" <<endl;
	int isum=0,size=100*1024*1024;
	timer();//void timer resets timer!
	for (int i=0;i<size;i++)
		isum+=i;
	timer("Time for 100 Mega int sums       ",size);
	double dsum=1.0;
	for (int i=0;i<size;i++)
		dsum=dsum/1.1111;
	timer("Time for 100 Mega double divisions",size);double d2=1.111;dsum+=0.1;
	for (int i=0;i<size;i++)
		dsum/=d2;
	timer("Time for 100 Mega double divisions-2",size);
	for (int i=0;i<size;i++)
		dsum=dsum*d2;
	timer("Time for 100 Mega double multiplications",size);
	for (int i=0;i<size;i++)
		dsum=dsum+d2;
	timer("Time for 100 Mega sums   multiplications",size);

	float fsum=1.0f;
	for (int i=0;i<size;i++)
		fsum=fsum/1.1111f;
	timer("Time for 100 Mega float  divisions",size);

	cout<<endl<<" Reject following line data (done to force for loops be performed after compiler optimizations):"<<endl;;
	cout<<isum<<dsum<<fsum<<endl;//to force for() be done on isum
	cout<<"=== FIN ==="<<endl;getchar();
	return 1;
}