fork download
copy 
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <iterator>
  4. #include <x86intrin.h>
  5.  
  6.  
  7. constexpr unsigned NN=1024*1024*4;
  8. #define time
  9. #ifdef time
  10. #define print(a...) ;
  11. #else
  12. #define print(a...) printf(a)
  13. #endif
  14. size_t st;
  15. struct A {
  16.    char* arr;
  17.    A() noexcept {
  18.       print("+A()   [%+03lld]\n",(size_t)this-st);
  19.       arr=new char[NN];
  20.       for (int i=0;i<NN;i++)
  21.          arr[i]=i;
  22.    }
  23.    ~A() noexcept {
  24.       print("~A()   [%+03lld]\n",(size_t)this-st);
  25.       if (arr)
  26.          delete[] arr;
  27.       arr=nullptr;
  28.    }
  29.    void operator=(A&& r)noexcept {
  30.       print("=A(&&) [%+03lld] = [%+03lld]\n",(size_t)this-st,(size_t)&r-st);
  31.       if (arr)
  32.          delete[] arr;
  33.       arr=r.arr;
  34.       r.arr=nullptr;
  35.    }
  36.    void operator=(A& r)noexcept {
  37.       print("=A(&)  [%+03lld] = [%+03lld]\n",(size_t)this-st,(size_t)&r-st);
  38.       if (arr)
  39.          delete[] arr;
  40.       arr=new char[NN];
  41.       for (int i=0;i<NN;i++)
  42.          arr[i]=r.arr[i];
  43.    }
  44.    A(A&& r)noexcept {
  45.       print("+A(&&) [%+03lld] ([%+03lld])\n",(size_t)this-st,(size_t)&r-st);
  46.       arr=r.arr;
  47.       r.arr=nullptr;
  48.    }
  49.    A(A& r)noexcept {
  50.       print("+A(&)  [%+03lld] ([%+03lld])\n",(size_t)this-st,(size_t)&r-st);
  51.       arr=new char[NN];
  52.       for (int i=0;i<NN;i++)
  53.          arr[i]=r.arr[i];
  54.  
  55.    }
  56.    A operator+(A& r)noexcept  {
  57.       A temp;
  58.       for (int i=0;i<NN;i++)
  59.          temp.arr[i]=arr[i]+r.arr[i];
  60.       print(" +(&)  [%+03lld] = [%+03lld]+[%+03lld]\n",(size_t)&temp-st,(size_t)this-st,(size_t)&r-st);
  61.       return temp;
  62.    }
  63.    void operator+=(A& r)noexcept  {
  64.       for (int i=0;i<NN;i++)
  65.         arr[i]+=r.arr[i];
  66.       print(" +=(&) [%+03lld] += [%+03lld]\n",(size_t)this-st,(size_t)&r-st);
  67.    }
  68. };
  69.  
  70. void add(A& a,A& b,A& c)noexcept {
  71.    print("f+(&)  [%+03lld] = [%+03lld]+[%+03lld]\n",(size_t)&a-st,(size_t)&b-st,(size_t)&c-st);
  72.    for (int i=0;i<NN;i++)
  73.       a.arr[i]=b.arr[i]+c.arr[i];
  74. }
  75.  
  76. int main(void) noexcept{
  77.    int r;st=(size_t)&r;
  78.    size_t t1,t2;
  79.    for (int u=0;u<3;u++){
  80.    printf("\n    ==1==\n");
  81.    t1=_rdtsc();
  82.    {
  83.       A a,b,c;
  84.       a=b+c;
  85.    }
  86.    t2=_rdtsc();
  87.    printf("   %.1f\n",(t2-t1)*1.0e-6);
  88.    printf("\n    ==2==\n");
  89.    t1=_rdtsc();
  90.    {
  91.       A a,b,c;
  92.       add(a,b,c);
  93.    }
  94.    t2=_rdtsc();
  95.    printf("   %.1f\n",(t2-t1)*1.0e-6);
  96.    printf("\n    ==3==\n");
  97.    t1=_rdtsc();
  98.    {
  99.       A a,b,c;
  100.       a=b;a+=c;
  101.    }
  102.    t2=_rdtsc();
  103.    printf("   %.1f\n",(t2-t1)*1.0e-6);
  104.    }
  105.    system("pause");
  106.    return 0;
  107. }
  108.  
Success #stdin #stdout #stderr 0.12s 19252KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
    ==1==
   63.1

    ==2==
   56.6

    ==3==
   48.0

    ==1==
   54.0

    ==2==
   48.8

    ==3==
   37.6

    ==1==
   37.2

    ==2==
   35.4

    ==3==
   37.3
stderr
copy 
sh: 1: pause: not found
https://ideone.com/71jojy
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!