1  /* PR tree-optimization/91914 - Invalid strlen folding for offset into struct
       2     { dg-do run }
       3     { dg-options "-O2 -Wall" } */
       4  
       5  #define assert(expr)						\
       6    ((expr)							\
       7     ? (void)0							\
       8     : (__builtin_printf ("%s:%i: assertion failed: %s\n",	\
       9  			__FILE__, __LINE__, #expr),		\
      10        __builtin_abort ()))
      11  
      12  extern __SIZE_TYPE__ strlen (const char*);
      13  
      14  struct stringpool_t
      15  {
      16    char s1[sizeof ("1")];
      17    char s2[sizeof ("12")];
      18    char s3[sizeof ("123")];
      19    char s4[sizeof ("1234")];
      20    char s5[sizeof ("12345")];
      21  };
      22  
      23  static const struct stringpool_t stringpool_contents =
      24    {
      25     "1", "12", "123", "1234", "12345"
      26    };
      27  
      28  #define stringpool ((const char *) &stringpool_contents)
      29  
      30  volatile int i0 = 0, i2 = 2, i5 = 5, i9 = 9, i14 = 14;
      31  
      32  int main (void)
      33  {
      34    /* These shouldn't trigger warnings.  */
      35    assert (strlen (stringpool) == 1);
      36    assert (strlen (stringpool + 2) == 2);
      37    assert (strlen (stringpool + 5) == 3);
      38    assert (strlen (stringpool + 9) == 4);
      39    assert (strlen (stringpool + 14) == 5);
      40  
      41    assert (strlen (stringpool + i0) == 1);
      42    assert (strlen (stringpool + i2) == 2);
      43    assert (strlen (stringpool + i5) == 3);
      44    assert (strlen (stringpool + i9) == 4);
      45    assert (strlen (stringpool + i14) == 5);
      46  }