lib/libm/src/s_finite.c

   1 /* @(#)s_finite.c 5.1 93/09/24 */
   2 /*
   3  * ====================================================
   4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * Developed at SunPro, a Sun Microsystems, Inc. business.
   7  * Permission to use, copy, modify, and distribute this
   8  * software is freely granted, provided that this notice
   9  * is preserved.
  10  * ====================================================
  11  *
  12  * $NetBSD: s_finite.c,v 1.11 2002/05/26 22:01:55 wiz Exp $
  13  * $DragonFly: src/lib/libm/src/s_finite.c,v 1.1 2005/07/26 21:15:20 joerg Exp $
  14  */
  15
  16 /*
  17  * finite(x) returns 1 is x is finite, else 0;
  18  * no branching!
  19  */
  20
  21 #include <math.h>
  22 #include "math_private.h"
  23
  24 int
  25 finite(double x)
  26 {
  27         int32_t hx;
  28         GET_HIGH_WORD(hx,x);
  29         return (int)((u_int32_t)((hx&0x7fffffff)-0x7ff00000)>>31);
  30 }