modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/nestfunc-3.c (about)

     1  /* { dg-require-effective-target trampolines } */
     2  
     3  extern long foo (long, long, long (*) (long, long));
     4  extern long use (long (*) (long, long), long, long);
     5  
     6  int
     7  main (void)
     8  {
     9    long sum = 0;
    10    long i;
    11  
    12    long nested_0 (long a, long b)
    13      {
    14        if (a > 2 * b)
    15          return a - b;
    16        else
    17          return b - a;
    18      }
    19  
    20    long nested_1 (long a, long b)
    21      {
    22        return use (nested_0, b, a) + sum;
    23      }
    24  
    25    long nested_2 (long a, long b)
    26      {
    27        return nested_1 (b, a);
    28      }
    29  
    30    for (i = 0; i < 10; ++i)
    31      {
    32        long j;
    33  
    34        for (j = 0; j < 10; ++j)
    35          {
    36            long k;
    37  
    38            for (k = 0; k < 10; ++k)
    39              sum += foo (i, j > k ? j - k : k - j, nested_2);
    40          }
    41      }
    42  
    43    if ((sum & 0xffffffff) != 0xbecfcbf5)
    44      abort ();
    45  
    46    exit (0);
    47  }
    48  
    49  long
    50  use (long (* func)(long, long), long a, long b)
    51  {
    52    return func (b, a);
    53  }
    54  
    55  long
    56  foo (long a, long b, long (* func) (long, long))
    57  {
    58    return func (a, b);
    59  }