0:           mov    eax,DWORD PTR 
   4:          bswap  eax
   6:          mov    edx,eax
   8:          and    eax,0xf0f0f0f
   d:          and    edx,0xf0f0f0f0
  13:          shr    edx,0x4
  16:          shl    eax,0x4
  19:          or     eax,edx
  1b:          mov    edx,eax
  1d:          and    eax,0x33333333
  22:          and    edx,0xcccccccc
  28:          shr    edx,0x2
  2b:          shl    eax,0x2
  2e:          or     eax,edx
  30:          mov    edx,eax
  32:          and    eax,0x55555555
  37:          and    edx,0xaaaaaaaa
  3d:          add    eax,eax
  3f:          shr    edx,1
  41:          or     eax,edx
  43:          ret