newlib/libm/common/s_infinity.c

   1 /*
   2  * infinity () returns the representation of infinity.
   3  * Added by Cygnus Support.
   4  */
   5
   6 /*
   7 FUNCTION
   8         <<infinity>>, <<infinityf>>---representation of infinity
   9
  10 INDEX
  11         infinity
  12 INDEX
  13         infinityf
  14
  15 SYNOPSIS
  16         #include <math.h>
  17         double infinity(void);
  18         float infinityf(void);
  19
  20 DESCRIPTION
  21         <<infinity>> and <<infinityf>> return the special number IEEE
  22         infinity in double- and single-precision arithmetic
  23         respectively.
  24
  25 PORTABILITY
  26 <<infinity>> and <<infinityf>> are neither standard C nor POSIX.  C and
  27 POSIX require macros HUGE_VAL and HUGE_VALF to be defined in math.h, which
  28 Newlib defines to be infinities corresponding to these archaic infinity()
  29 and infinityf() functions in floating-point implementations which do have
  30 infinities.
  31
  32 QUICKREF
  33         infinity - pure
  34
  35 */
  36
  37 #include "fdlibm.h"
  38
  39 #ifndef _DOUBLE_IS_32BITS
  40
  41         double infinity()
  42 {
  43         double x;
  44
  45         INSERT_WORDS(x,0x7ff00000,0);
  46         return x;
  47 }
  48
  49 #endif /* _DOUBLE_IS_32BITS */