gcc/testsuite/gcc.c-torture/execute/20111212-1.c

   1 /* PR tree-optimization/50569 */
   2 /* Reported by Paul Koning <pkoning@gcc.gnu.org> */
   3 /* Reduced testcase by Mikael Pettersson <mikpe@it.uu.se> */
   4
   5 struct event {
   6     struct {
   7         unsigned int sec;
   8     } sent __attribute__((packed));
   9 };
  10
  11 void __attribute__((noinline,noclone)) frob_entry(char *buf)
  12 {
  13     struct event event;
  14
  15     __builtin_memcpy(&event, buf, sizeof(event));
  16     if (event.sent.sec < 64) {
  17         event.sent.sec = -1U;
  18         __builtin_memcpy(buf, &event, sizeof(event));
  19     }
  20 }
  21
  22 int main(void)
  23 {
  24     union {
  25         char buf[1 + sizeof(struct event)];
  26         int align;
  27     } u;
  28
  29     __builtin_memset(&u, 0, sizeof u);
  30
  31     frob_entry(&u.buf[1]);
  32
  33     return 0;
  34 }