trunk/gcc/testsuite/gcc.c-torture/execute/ieee/pr30704.c

   1 /* PR middle-end/30704 */
   2
   3 typedef __SIZE_TYPE__ size_t;
   4 extern void abort (void);
   5 extern int memcmp (const void *, const void *, size_t);
   6 extern void *memcpy (void *, const void *, size_t);
   7
   8 long long
   9 f1 (void)
  10 {
  11   long long t;
  12   double d = 0x0.fffffffffffff000p-1022;
  13   memcpy (&t, &d, sizeof (long long));
  14   return t;
  15 }
  16
  17 double
  18 f2 (void)
  19 {
  20   long long t = 0x000fedcba9876543LL;
  21   double d;
  22   memcpy (&d, &t, sizeof (long long));
  23   return d;
  24 }
  25
  26 int
  27 main ()
  28 {
  29   union
  30   {
  31     long long ll;
  32     double d;
  33   } u;
  34
  35   if (sizeof (long long) != sizeof (double) || __DBL_MIN_EXP__ != -1021)
  36     return 0;
  37
  38   u.ll = f1 ();
  39   if (u.d != 0x0.fffffffffffff000p-1022)
  40     abort ();
  41
  42   u.d = f2 ();
  43   if (u.ll != 0x000fedcba9876543LL)
  44     abort ();
  45
  46   double b = 234.0;
  47   long long c;
  48   double d = b;
  49   memcpy (&c, &b, sizeof (double));
  50   long long e = c;
  51   if (memcmp (&e, &d, sizeof (double)) != 0)
  52     abort ();
  53
  54   return 0;
  55 }