gcc/testsuite/gcc.dg/tree-ssa/pr80803.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O" } */
   3
   4 struct S0
   5 {
   6   unsigned a : 15;
   7   int b;
   8   int c;
   9 };
  10
  11 struct S1
  12 {
  13   struct S0 s0;
  14   int e;
  15 };
  16
  17 struct Z
  18 {
  19   char c;
  20   int z;
  21 } __attribute__((packed));
  22
  23 union U
  24 {
  25   struct S1 s1;
  26   struct Z z;
  27 };
  28
  29
  30 int __attribute__((noinline, noclone))
  31 return_zero (void)
  32 {
  33   return 0;
  34 }
  35
  36 volatile union U gu;
  37 struct S0 gs;
  38
  39 int __attribute__((noinline, noclone))
  40 check_outcome ()
  41 {
  42   if (gs.a != 6
  43       || gs.b != 80000)
  44     __builtin_abort ();
  45 }
  46
  47 int
  48 main (int argc, char *argv[])
  49 {
  50   union U u;
  51   struct S1 m,n;
  52   struct S0 l;
  53
  54   if (return_zero ())
  55     u.z.z = 20000;
  56   else
  57     {
  58       u.s1.s0.a = 6;
  59       u.s1.s0.b = 80000;
  60       u.s1.e = 2;
  61
  62       n = u.s1;
  63       m = n;
  64       m.s0.c = 0;
  65       l = m.s0;
  66       gs = l;
  67     }
  68
  69   gu = u;
  70   check_outcome ();
  71   return 0;
  72 }