gcc/testsuite/c-c++-common/torture/builtin-clear-padding-3.c

   1 /* PR libstdc++/88101 */
   2
   3 union V { char a; signed char b; unsigned char c; };
   4 struct T { char a; int b; union V c; };
   5 union U { int a; long double b; struct T c; };
   6 struct S { char a; union U b; long long c; char d; } s1, s2;
   7
   8 __attribute__((noipa)) void
   9 foo (struct S *s, int x)
  10 {
  11   s->a = -1; s->c = -1; s->d = -1;
  12   switch (x)
  13     {
  14     case 0:
  15       s->b.a = -1;
  16       break;
  17     case 1:
  18       s->b.b = -12345.25L;
  19       break;
  20     case 2:
  21       s->b.c.a = -1;
  22       s->b.c.b = -1;
  23       s->b.c.c.b = -1;
  24       break;
  25     }
  26 }
  27
  28 int
  29 main ()
  30 {
  31   __builtin_memset (&s1, 0, sizeof (s1));
  32   __builtin_memset (&s2, -1, sizeof (s2));
  33   foo (&s1, 0);
  34   foo (&s2, 0);
  35   __builtin_clear_padding (&s2);
  36   if (s2.b.a != (char) -1)
  37     __builtin_abort ();
  38   __builtin_clear_padding (&s2.b.a);
  39   __builtin_memset (&s2.b.a + 1, 0, sizeof (union U) - sizeof (s2.b.a));
  40   if (__builtin_memcmp (&s1, &s2, sizeof (s1)))
  41     __builtin_abort ();
  42   __builtin_memset (&s1, 0, sizeof (s1));
  43   __builtin_memset (&s2, -1, sizeof (s2));
  44   foo (&s1, 1);
  45   foo (&s2, 1);
  46   __builtin_clear_padding (&s2);
  47   if (s2.b.b != -12345.25L)
  48     __builtin_abort ();
  49   __builtin_clear_padding (&s2.b.b);
  50   __builtin_memset (&s2.b.b + 1, 0, sizeof (union U) - sizeof (s2.b.b));
  51   if (__builtin_memcmp (&s1, &s2, sizeof (s1)))
  52     __builtin_abort ();
  53   __builtin_memset (&s1, 0, sizeof (s1));
  54   __builtin_memset (&s2, -1, sizeof (s2));
  55   foo (&s1, 2);
  56   foo (&s2, 2);
  57   __builtin_clear_padding (&s2);
  58   if (s2.b.c.a != (char) -1 || s2.b.c.b != -1 || s2.b.c.c.b != -1)
  59     __builtin_abort ();
  60   __builtin_clear_padding (&s2.b.c);
  61   __builtin_memset (&s2.b.c + 1, 0, sizeof (union U) - sizeof (s2.b.c));
  62   if (__builtin_memcmp (&s1, &s2, sizeof (s1)))
  63     __builtin_abort ();
  64   return 0;
  65 }