RtlCompareMemory

SIZE_T __stdcall RtlCompareMemory(VOID *Source1, VOID *Source2, SIZE_T Length){
  _BYTE *v3; 
  _BYTE *v4; 
  __int64 v5; 
  bool v6; 
  SIZE_T v7; 
  bool v8; 
  bool v9; 
  SIZE_T v10; 
  SIZE_T v11; 
  bool v13; 
  SIZE_T v14; 
  v3 = Source1;
  v4 = Source2;
  if( (((unsigned __int8)Source1 ^ (unsigned __int8)Source2) & 7) != 0 || Length < 8 )
  {
    v13 = Length == 0;
    if( Length )
    {
      v14 = Length;
      do
      {
        if( !v14 )
          break;
        v13 = *v3++ == *v4++;
        --v14;
      }
      while( v13 );
      if( !v13 )
        Length -= v14 + 1;
    }
    return Length;
  }
  else
  {
    v5 = -(int)Source1 & 7;
    if( (_DWORD)v5 )
    {
      Length -= (unsigned int)v5;
      v6 = Length == 0;
      do
      {
        if( !v5 )
          break;
        v6 = *v3++ == *v4++;
        --v5;
      }
      while( v6 );
      if( !v6 )
        goto LABEL_19;
    }
    v7 = Length & 0xFFFFFFFFFFFFFFF8ui64;
    if( (Length & 0xFFFFFFFFFFFFFFF8ui64) != 0 )
    {
      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 + Length == 0;
    v10 = v7 + Length;
    if( v10 )
    {
      v11 = v10;
      do
      {
        if( !v11 )
          break;
        v9 = *v3++ == *v4++;
        --v11;
      }
      while( v9 );
      if( !v9 )
LABEL_19:
        --v4;
    }
    return v4 - (_BYTE *)Source2;
  }
}

Referenced by: