1/*
2 This test checks promotion of bitfields.  Bitfields should be promoted
3 very much like chars and shorts:
4
5 Bitfields (signed or unsigned) should be promoted to signed int if their
6 value will fit in a signed int, otherwise to an unsigned int if their
7 value will fit in an unsigned int, otherwise we don't promote them (ANSI/ISO
8 does not specify the behavior of bitfields larger than an unsigned int).
9
10 We test the behavior by subtracting two from the promoted value: this will
11 result in a negitive value for signed types, a positive value for unsigned
12 types.  This test (of course) assumes that the compiler is correctly
13 implementing signed and unsigned arithmetic.
14 */
15
16struct X {
17  unsigned int	     u3:3;
18    signed long int  s31:31;
19    signed long int  s32:32;
20  unsigned long int  u31:31;
21  unsigned long int  u32:32;
22  unsigned long long ull3 :3;
23  unsigned long long ull35:35;
24  unsigned u15:15;
25};
26
27struct X x;
28
29main ()
30{
31  if ((x.u3 - 2) >= 0)		/* promoted value should be signed */
32    abort ();
33
34  if ((x.s31 - 2) >= 0)		/* promoted value should be signed */
35    abort ();
36
37  if ((x.s32 - 2) >= 0)		/* promoted value should be signed */
38    abort ();
39
40  if ((x.u15 - 2) >= 0)		/* promoted value should be signed */
41    abort ();
42
43  /* Conditionalize check on whether integers are 4 bytes or larger, i.e.
44     larger than a 31 bit bitfield.  */
45  if (sizeof (int) >= 4)
46    {
47      if ((x.u31 - 2) >= 0)	/* promoted value should be signed */
48	abort ();
49    }
50  else
51    {
52      if ((x.u31 - 2) < 0)	/* promoted value should be UNsigned */
53	abort ();
54    }
55
56  if ((x.u32 - 2) < 0)		/* promoted value should be UNsigned */
57    abort ();
58
59  if ((x.ull3 - 2) >= 0)	/* promoted value should be signed */
60    abort ();
61
62  if ((x.ull35 - 2) < 0)	/* promoted value should be UNsigned */
63    abort ();
64
65  exit (0);
66}
67