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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [testsuite/] [gcc.c-torture/] [execute/] [20011126-2.c] - Blame information for rev 297

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Line No. Rev Author Line
1 297 jeremybenn
/* Problem originally visible on ia64.
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   There is a partial redundancy of "in + 1" that makes GCSE want to
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   transform the final while loop to
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     p = in + 1;
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     tmp = p;
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     ...
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     goto start;
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   top:
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     tmp = tmp + 1;
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   start:
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     in = tmp;
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     if (in < p) goto top;
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   We miscalculate the number of loop iterations as (p - tmp) = 0
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   instead of (p - in) = 1, which results in overflow in the doloop
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   optimization.  */
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static const char *
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test (const char *in, char *out)
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{
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  while (1)
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    {
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      if (*in == 'a')
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        {
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          const char *p = in + 1;
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          while (*p == 'x')
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            ++p;
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          if (*p == 'b')
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            return p;
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          while (in < p)
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            *out++ = *in++;
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        }
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    }
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}
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int main ()
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{
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  char out[4];
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  test ("aab", out);
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  return 0;
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}

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