gcc/testsuite/gcc.dg/torture/pr116768.c

   1 /* { dg-do run } */
   2
   3 #define numwords 2
   4
   5 typedef struct {
   6   unsigned words[numwords];
   7 } Child;
   8
   9 typedef struct {
  10   Child child;
  11 } Parent;
  12
  13 Parent my_or(Parent x, const Parent *y) {
  14   const Child *y_child = &y->child;
  15   for (int i = 0; i < numwords; i++) {
  16     x.child.words[i] |= y_child->words[i];
  17   }
  18   return x;
  19 }
  20
  21 int main() {
  22   Parent bs[4];
  23   __builtin_memset(bs, 0, sizeof(bs));
  24
  25   bs[0].child.words[0] = 1;
  26   for (int i = 1; i <= 3; i++) {
  27     bs[i] = my_or(bs[i], &bs[i - 1]);
  28   }
  29   if (bs[2].child.words[0] != 1)
  30     __builtin_abort ();
  31   return 0;
  32 }