summaryrefslogtreecommitdiff
path: root/gcc/testsuite/gcc.c-torture/execute/ieee/pr30704.c
blob: 2b63e67a0bd6437ea5ac9546f78c913ba060fb07 (plain)
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
/* PR middle-end/30704 */

typedef __SIZE_TYPE__ size_t;
extern void abort (void);
extern int memcmp (const void *, const void *, size_t);
extern void *memcpy (void *, const void *, size_t);

long long
f1 (void)
{
  long long t;
  double d = 0x0.fffffffffffff000p-1022;
  memcpy (&t, &d, sizeof (long long));
  return t;
}

double
f2 (void)
{
  long long t = 0x000fedcba9876543LL;
  double d;
  memcpy (&d, &t, sizeof (long long));
  return d;
}

int
main ()
{
  union
  {
    long long ll;
    double d;
  } u;

  if (sizeof (long long) != sizeof (double) || __DBL_MIN_EXP__ != -1021)
    return 0;

  u.ll = f1 ();
  if (u.d != 0x0.fffffffffffff000p-1022)
    abort ();

  u.d = f2 ();
  if (u.ll != 0x000fedcba9876543LL)
    abort ();

  double b = 234.0;
  long long c;
  double d = b;
  memcpy (&c, &b, sizeof (double));
  long long e = c;
  if (memcmp (&e, &d, sizeof (double)) != 0)
    abort ();

  return 0;
}