View difference between Paste ID: qDvLGBfU and 2Bf1mQnx

 #include <chrono>
 #include <Eigen/Dense>
 
 
 #define START_TIMER(start)  auto start = std::chrono::high_resolution_clock::now();
 
 #define STOP_TIMER_MILLI( _count_, start)  \
     auto _count_ = std::chrono::duration<double,std::milli>(std::chrono::high_resolution_clock::now() - start ).count();
 
 class CPUTimer{
 
 public:
     using ClockType = std::chrono::high_resolution_clock;
 
     inline void start(){
         m_start = ClockType::now();
     }
 
     /** returns elapsed time in nanosecond*/
     inline double elapsed(){
         return std::chrono::duration<double,std::nano >(ClockType::now()-m_start).count();
     }
     /** returns elapsed time in second*/
     inline double elapsedSec(){
         return std::chrono::duration<double,std::ratio<1> >(ClockType::now()-m_start).count();
     }
     /** returns elapsed time in minutes*/
     inline double elapsedMin(){
         return std::chrono::duration<double,std::ratio<60> >(ClockType::now()-m_start).count();
     }
 
     /** returns elapsed time in millisecond*/
     inline double elapsedMilliSec(){
          return std::chrono::duration<double,std::milli>(ClockType::now()-m_start).count();
     }
 
 private:
     std::chrono::time_point<ClockType> m_start;
 };
 
 int  main( int  argc, char  ** argv ){
 
 
 
     using Idx = Eigen::Array<long long int,3,1>  ;
 
     Idx max(4,3,9);
     Idx idx(-1,5,10);
     Idx t(0,0,0);
 
     auto loops = 500000;
 
     Idx zero(0,0,0);
     srand(5);
     START_TIMER(start)
     EIGEN_ASM_COMMENT("BEGIN1");
     for(auto k=0; k<loops;++k){
         idx.setRandom();
         t += zero.max(max.min(idx));
     }
     EIGEN_ASM_COMMENT("END1");
 
     STOP_TIMER_MILLI(count,start)
     std::cout << "Eigen3: time: " << count << " ms " << t <<  std::endl;
 
     t.setZero();
     srand(5);
     START_TIMER(start2)
     EIGEN_ASM_COMMENT("BEGIN2");
     for(auto k=0; k<loops;++k){
         idx.setRandom();
         t(0) += std::max(   std::min( max(0), idx(0)),  0LL   );
         t(1) += std::max(   std::min( max(1), idx(1)),  0LL   );
         t(2) += std::max(   std::min( max(2), idx(2)),  0LL   );
     }
     STOP_TIMER_MILLI(count2,start2)
     EIGEN_ASM_COMMENT("END2");
     std::cout << "Seperate: time: " << count2 << " ms " << t << std::endl;
 
 }