gcc/testsuite/gcc.dg/980217-1.c

   1 /* Test float on alpha. */
   2
   3 /* { dg-do run { target alpha*-*-* } } */
   4 /* { dg-options "-mieee -O2" } */
   5
   6 extern void abort(void);
   7
   8 typedef int int32_t __attribute__ ((__mode__ (  __SI__ ))) ;
   9 typedef union
  10 {
  11   float value;
  12   int32_t word;
  13 } ieee_float_shape_type;
  14
  15 int isinff(float x)
  16 {
  17   int32_t ix,t;
  18   ieee_float_shape_type gf_u;
  19   gf_u.value = x;
  20   ix = gf_u.word;
  21   printf ("%x\n", ix);
  22   t = ix & 0x7fffffff;
  23   t ^= 0x7f800000;
  24   t |= -t;
  25   return ~(t >> 31) & (1 - ((ix & 0x80000000) >> 30));
  26 }
  27
  28 main ()
  29 {
  30   float x = 1.0 / 0.0;
  31   int i = isinff (x);
  32
  33   if (i == 0)
  34     abort ();
  35
  36   printf ("%d\n", i);
  37   return 0;
  38 }