gcc/testsuite/gcc.c-torture/execute/pr51877.c

   1 /* PR tree-optimization/51877 */
   2
   3 extern void abort (void);
   4 struct A { int a; char b[32]; } a, b;
   5
   6 __attribute__((noinline, noclone))
   7 struct A
   8 bar (int x)
   9 {
  10   struct A r;
  11   static int n;
  12   r.a = ++n;
  13   __builtin_memset (r.b, 0, sizeof (r.b));
  14   r.b[0] = x;
  15   return r;
  16 }
  17
  18 __attribute__((noinline, noclone))
  19 void
  20 baz (void)
  21 {
  22   asm volatile ("" : : : "memory");
  23 }
  24
  25 __attribute__((noinline, noclone))
  26 void
  27 foo (struct A *x, int y)
  28 {
  29   if (y == 6)
  30     a = bar (7);
  31   else
  32     *x = bar (7);
  33   baz ();
  34 }
  35
  36 int
  37 main ()
  38 {
  39   a = bar (3);
  40   b = bar (4);
  41   if (a.a != 1 || a.b[0] != 3 || b.a != 2 || b.b[0] != 4)
  42     abort ();
  43   foo (&b, 0);
  44   if (a.a != 1 || a.b[0] != 3 || b.a != 3 || b.b[0] != 7)
  45     abort ();
  46   foo (&b, 6);
  47   if (a.a != 4 || a.b[0] != 7 || b.a != 3 || b.b[0] != 7)
  48     abort ();
  49   return 0;
  50 }