gcc/testsuite/gcc.c-torture/execute/20180131-1.c

   1 /* PR rtl-optimization/84071 */
   2 /* Reported by Wilco <wilco@gcc.gnu.org> */
   3
   4 extern void abort (void);
   5
   6 typedef union
   7 {
   8   signed short ss;
   9   unsigned short us;
  10   int x;
  11 } U;
  12
  13 int f(int x, int y, int z, int a, U u) __attribute__((noclone, noinline));
  14
  15 int f(int x, int y, int z, int a, U u)
  16 {
  17   return (u.ss <= 0) + u.us;
  18 }
  19
  20 int main (void)
  21 {
  22   U u = { .ss = -1 };
  23
  24   if (f (0, 0, 0, 0, u) != (1 << sizeof (short) * 8))
  25     abort ();
  26
  27   return 0;
  28 }