0000000000400830 <_Z6existsi>:
  400830:       b8 01 00 00 00          mov    $0x1,%eax
  400835:       c3                      retq   
  400836:       66 2e 0f 1f 84 00 00    nopw   %cs:0x0(%rax,%rax,1)
  40083d:       00 00 00 

