lib/libm/src/s_isinff.c

   1 /*
   2  * Written by J.T. Conklin <jtc@NetBSD.org>.
   3  * Public domain.
   4  */
   5
   6 #include <sys/cdefs.h>
   7 #if defined(LIBM_SCCS) && !defined(lint)
   8 __RCSID("$NetBSD: s_isinff.c,v 1.5 2002/05/26 22:01:56 wiz Exp $");
   9 #endif
  10
  11 /*
  12  * isinff(x) returns 1 is x is inf, else 0;
  13  * no branching!
  14  */
  15
  16 #include "math.h"
  17 #include "math_private.h"
  18
  19 int
  20 isinff(float x)
  21 {
  22         int32_t ix;
  23         GET_FLOAT_WORD(ix,x);
  24         ix &= 0x7fffffff;
  25         ix ^= 0x7f800000;
  26         return (ix == 0);
  27 }