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