gcc/testsuite/gcc.c-torture/execute/pr48571-1.c

   1 #define S (sizeof (int))
   2
   3 unsigned int c[624];
   4 void __attribute__((noinline))
   5 bar (void)
   6 {
   7   unsigned int i;
   8   /* Obfuscated c[i] = c[i-1] * 2.  */
   9   for (i = 1; i < 624; ++i)
  10     *(unsigned int *)((void *)c + (__SIZE_TYPE__)i * S)
  11         = 2 * *(unsigned int *)((void *)c + ((__SIZE_TYPE__)i +
  12                                              ((__SIZE_TYPE__)-S)/S) * S);
  13 }
  14 extern void abort (void);
  15 int
  16 main()
  17 {
  18   unsigned int i, j;
  19   for (i = 0; i < 624; ++i)
  20     c[i] = 1;
  21   bar();
  22   j = 1;
  23   for (i = 0; i < 624; ++i)
  24     {
  25       if (c[i] != j)
  26         abort ();
  27       j = j * 2;
  28     }
  29   return 0;
  30 }