gcc/testsuite/gcc.target/alpha/980217-1.c

   1 /* Test float on alpha. */
   2
   3 /* { dg-do run } */
   4 /* { dg-options "-mieee -O2" } */
   5
   6 extern void abort(void);
   7 extern int printf(const char *, ...);
   8
   9 typedef int int32_t __attribute__ ((__mode__ (  __SI__ ))) ;
  10 typedef union
  11 {
  12   float value;
  13   int32_t word;
  14 } ieee_float_shape_type;
  15
  16 int isinff(float x)
  17 {
  18   int32_t ix,t;
  19   ieee_float_shape_type gf_u;
  20   gf_u.value = x;
  21   ix = gf_u.word;
  22   printf ("%x\n", ix);
  23   t = ix & 0x7fffffff;
  24   t ^= 0x7f800000;
  25   t |= -t;
  26   return ~(t >> 31) & (1 - ((ix & 0x80000000) >> 30));
  27 }
  28
  29 int main ()
  30 {
  31   float x = 1.0 / 0.0;
  32   int i = isinff (x);
  33
  34   if (i == 0)
  35     abort ();
  36
  37   printf ("%d\n", i);
  38   return 0;
  39 }