old-autovect-branch/gcc/testsuite/gcc.c-torture/execute/builtins/20010124-1.c

   1 /* Verify that structure return doesn't invoke memcpy on
   2    overlapping objects.  */
   3
   4 extern void abort (void);
   5
   6 struct S {
   7   char stuff[1024];
   8 };
   9
  10 union U {
  11   struct {
  12     int space;
  13     struct S s;
  14   } a;
  15   struct {
  16     struct S s;
  17     int space;
  18   } b;
  19 };
  20
  21 struct S f(struct S *);
  22 void g(union U *);
  23
  24 void main_test(void)
  25 {
  26   union U u;
  27   u.b.s = f(&u.a.s);
  28   u.a.s = f(&u.b.s);
  29   g(&u);
  30 }