gcc/testsuite/gcc.dg/tree-ssa/pr51583.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1" } */
   3
   4 typedef __complex__ double Value;
   5
   6 union U
   7 {
   8   Value v;
   9   char c[sizeof(Value)];
  10 };
  11
  12 struct S
  13 {
  14   union U u;
  15   int i,j;
  16 };
  17
  18 Value gv;
  19 int gi, gj;
  20
  21 Value foo (void)
  22 {
  23   struct S s,t;
  24
  25   t.i = gi;
  26   t.j = gj;
  27   t.u.v = gv;
  28   t.u.c[0] = 0;
  29
  30   s = t;
  31   __imag__ s.u.v += s.i;
  32
  33   return s.u.v;
  34 }