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/* Problem originally visible on ia64.

   There is a partial redundancy of "in + 1" that makes GCSE want to

   transform the final while loop to

     p = in + 1;

     tmp = p;

     ...

     goto start;

   top:

     tmp = tmp + 1;

   start:

     in = tmp;

     if (in < p) goto top;

   We miscalculate the number of loop iterations as (p - tmp) = 0

   instead of (p - in) = 1, which results in overflow in the doloop

   optimization.  */

static const char *

test (const char *in, char *out)

{

  while (1)

    {

      if (*in == 'a')

        {

          const char *p = in + 1;

          while (*p == 'x')

            ++p;

          if (*p == 'b')

            return p;

          while (in < p)

            *out++ = *in++;

        }

    }

}

int main ()

{

  char out[4];

  test ("aab", out);

  return 0;

}