Framework20StringEquals.cs

public bool Equals(string value)
{
  return (value != null || this == null) && string.EqualsHelper(this, value);
}

private static unsafe bool EqualsHelper(string strA, string strB)
{
  int length = strA.Length;
  if (length != strB.Length)
    return false;
  fixed (char* chPtr1 = strA)
    fixed (char* chPtr2 = strB)
    {
      char* chPtr3 = chPtr1;
      char* chPtr4;
      for (chPtr4 = chPtr2; length >= 10 && (*(int*) chPtr3 == *(int*) chPtr4 && *(int*) (chPtr3 + 2) == *(int*) (chPtr4 + 2)) && (*(int*) (chPtr3 + 4) == *(int*) (chPtr4 + 4) && *(int*) (chPtr3 + 6) == *(int*) (chPtr4 + 6) && *(int*) (chPtr3 + 8) == *(int*) (chPtr4 + 8)); length -= 10)
      {
        chPtr3 += 10;
        chPtr4 += 10;
      }
      for (; length > 0 && *(int*) chPtr3 == *(int*) chPtr4; length -= 2)
      {
        chPtr3 += 2;
        chPtr4 += 2;
      }
      return length <= 0;
    }
}