gcc/testsuite/gcc.c-torture/execute/pr49279.c

   1 /* PR tree-optimization/49279 */
   2 extern void abort (void);
   3
   4 struct S { int a; int *__restrict p; };
   5
   6 __attribute__((noinline, noclone))
   7 struct S *bar (struct S *p)
   8 {
   9   struct S *r;
  10   asm volatile ("" : "=r" (r) : "0" (p) : "memory");
  11   return r;
  12 }
  13
  14 __attribute__((noinline, noclone))
  15 int
  16 foo (int *p, int *q)
  17 {
  18   struct S s, *t;
  19   s.a = 1;
  20   s.p = p;
  21   t = bar (&s);
  22   t->p = q;
  23   s.p[0] = 0;
  24   t->p[0] = 1;
  25   return s.p[0];
  26 }
  27
  28 int
  29 main ()
  30 {
  31   int a, b;
  32   if (foo (&a, &b) != 1)
  33     abort ();
  34   return 0;
  35 }