What is the best or fastest way to compare two strings?

Question

I'm not sure how fast the code is below. If anyone knows a faster / optimized code than this, please let me know.

int xstrcmp(char *s1, char *s2)
{
  while (*s1 == *s2++)
            if (*s1++ == 0)
                    return (0);
  return (*(const unsigned char *)s1 - *(const unsigned char *)(s2-1));
}

Answer 1

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Answer 2

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Answer 3

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