RtlCompareMemory

_SIZE_T *__stdcall RtlCompareMemory(const VOID *Source1, const VOID *Source2, _SIZE_T Length){
  _BYTE *v3; 
  _BYTE *v4; 
  __int64 v5; 
  bool v6; 
  unsigned __int64 v7; 
  bool v8; 
  bool v9; 
  unsigned __int64 v10; 
  unsigned __int64 v11; 
  bool v13; 
  __int64 v14; 

  v3 = Source1;
  v4 = Source2;
  if( (((unsigned __int8)Source1 ^ (unsigned __int8)Source2) & 7) != 0 || *(_QWORD *)&Length < 8ui64 )
  {
    v13 = *(_QWORD *)&Length == 0i64;
    if( *(_QWORD *)&Length )
    {
      v14 = *(_QWORD *)&Length;
      do
      {
        if( !v14 )
          break;
        v13 = *v3++ == *v4++;
        --v14;
      }
      while( v13 );
      if( !v13 )
        *(_QWORD *)&Length -= v14 + 1;
    }
    return *(_SIZE_T **)&Length;
  }
  else
  {
    v5 = -(int)Source1 & 7;
    if( (_DWORD)v5 )
    {
      *(_QWORD *)&Length -= (unsigned int)v5;
      v6 = *(_QWORD *)&Length == 0i64;
      do
      {
        if( !v5 )
          break;
        v6 = *v3++ == *v4++;
        --v5;
      }
      while( v6 );
      if( !v6 )
        goto LABEL_19;
    }
    v7 = *(_QWORD *)&Length & 0xFFFFFFFFFFFFFFF8ui64;
    if( (*(_QWORD *)&Length & 0xFFFFFFFFFFFFFFF8ui64) != 0 )
    {
      *(_QWORD *)&Length -= v7;
      v7 >>= 3;
      v8 = v7 == 0;
      do
      {
        if( !v7 )
          break;
        v8 = *(_QWORD *)v3 == *(_QWORD *)v4;
        v3 += 8;
        v4 += 8;
        --v7;
      }
      while( v8 );
      if( !v8 )
      {
        v3 -= 8;
        v4 -= 8;
        v7 = 8 * (v7 + 1);
      }
    }
    v9 = v7 + *(_QWORD *)&Length == 0;
    v10 = v7 + *(_QWORD *)&Length;
    if( v10 )
    {
      v11 = v10;
      do
      {
        if( !v11 )
          break;
        v9 = *v3++ == *v4++;
        --v11;
      }
      while( v9 );
      if( !v9 )
LABEL_19:
        --v4;
    }
    return(_SIZE_T *)(v4 - (_BYTE *)Source2);
  }
}

Referenced by: