gcc/testsuite/gcc.dg/pr111683-2.c

   1 /* PR middle-end/111683 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 int b[6] = { 3, 4, 5, 6, 7, 8 }, c[12];
   6 int d[16] = { 0, 1, 3, 6, 10, 14, 12, 9, 5, 0, 0, 0 };
   7
   8 int
   9 main ()
  10 {
  11   int i;
  12   if (sizeof (int) * 2 != sizeof (long long))
  13     return 0;
  14   for (i = 0; i < 6; i++)
  15     {
  16       long long a;
  17       __builtin_memcpy (&a, &c[i], sizeof (a));
  18       a += (((long long) i) << (sizeof (int) * __CHAR_BIT__)) + i;
  19       __builtin_memcpy (&c[i], &a, sizeof (a));
  20       __builtin_memcpy (&a, &c[i + 2], sizeof (a));
  21       a += (((long long) i) << (sizeof (int) * __CHAR_BIT__)) + i;
  22       __builtin_memcpy (&c[i + 2], &a, sizeof (a));
  23     }
  24   if (__builtin_memcmp (&c[0], &d[0], sizeof (c)))
  25     __builtin_abort ();
  26   return 0;
  27 }