modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/pr89634.c (about)

     1  /* PR rtl-optimization/89634 */
     2  
     3  static unsigned long *
     4  foo (unsigned long *x)
     5  {
     6    return x + (1 + *x);
     7  }
     8  
     9  __attribute__((noipa)) unsigned long
    10  bar (unsigned long *x)
    11  {
    12    unsigned long c, d = 1, e, *f, g, h = 0, i;
    13    for (e = *x - 1; e > 0; e--)
    14      {
    15        f = foo (x + 1);
    16        for (i = 1; i < e; i++)
    17  	f = foo (f);
    18        c = *f;
    19        if (c == 2)
    20  	d *= 2;
    21        else
    22  	{
    23  	  i = (c - 1) / 2 - 1;
    24  	  g = (2 * i + 1) * (d + 1) + (2 * d + 1);
    25  	  if (g > h)
    26  	    h = g;
    27  	  d *= c;
    28  	}
    29      }
    30    return h;
    31  }
    32  
    33  int
    34  main ()
    35  {
    36    unsigned long a[18] = { 4, 2, -200, 200, 2, -400, 400, 3, -600, 0, 600, 5, -100, -66, 0, 66, 100, __LONG_MAX__ / 8 + 1 };
    37    if (bar (a) != 17)
    38      __builtin_abort ();
    39    return 0;
    40  }