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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     float sum=0;
  7.     for(int i = 0; i < 10; i++)
  8.         sum += 1.0f/float(i+1);
  9.     cout<<sum<<endl;
  10.     return 0;
  11. }
  12.    
  13. g++ -O3 main.cpp && ./a.out
  14.    
  15. .file   "main.cpp"
  16.     .section    .text.startup,"ax",@progbits
  17.     .p2align 4,,15
  18.     .globl  main
  19.     .type   main, @function
  20. main:
  21. .LFB1561:
  22.     .cfi_startproc
  23.     subq    $8, %rsp
  24.     .cfi_def_cfa_offset 16
  25.     movl    $_ZSt4cout, %edi
  26.     movsd   .LC0(%rip), %xmm0
  27.     call    _ZNSo9_M_insertIdEERSoT_
  28.     movq    %rax, %rdi
  29.     call    _ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_
  30.     xorl    %eax, %eax
  31.     addq    $8, %rsp
  32.     .cfi_def_cfa_offset 8
  33.     ret
  34.     .cfi_endproc
  35. .LFE1561:
  36.     .size   main, .-main
  37.     .p2align 4,,15
  38.     .type   _GLOBAL__sub_I_main, @function
  39. _GLOBAL__sub_I_main:
  40. .LFB2048:
  41.     .cfi_startproc
  42.     subq    $8, %rsp
  43.     .cfi_def_cfa_offset 16
  44.     movl    $_ZStL8__ioinit, %edi
  45.     call    _ZNSt8ios_base4InitC1Ev
  46.     movl    $__dso_handle, %edx
  47.     movl    $_ZStL8__ioinit, %esi
  48.     movl    $_ZNSt8ios_base4InitD1Ev, %edi
  49.     addq    $8, %rsp
  50.     .cfi_def_cfa_offset 8
  51.     jmp __cxa_atexit
  52.     .cfi_endproc
  53. .LFE2048:
  54.     .size   _GLOBAL__sub_I_main, .-_GLOBAL__sub_I_main
  55.     .section    .init_array,"aw"
  56.     .align 8
  57.     .quad   _GLOBAL__sub_I_main
  58.     .local  _ZStL8__ioinit
  59.     .comm   _ZStL8__ioinit,1,1
  60.     .section    .rodata.cst8,"aM",@progbits,8
  61.     .align 8
  62. .LC0:
  63.     .long   0
  64.     .long   1074228871
  65.     .hidden __dso_handle
  66.     .ident  "GCC: (Ubuntu 7.2.0-1ubuntu1~16.04) 7.2.0"
  67.     .section    .note.GNU-stack,"",@progbits
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