sysdeps/libm-ieee754/s_isnanf.c

   1 /* s_isnanf.c -- float version of s_isnan.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: s_isnanf.c,v 1.4 1995/05/10 20:47:38 jtc Exp $";
  18 #endif
  19
  20 /*
  21  * isnanf(x) returns 1 is x is nan, else 0;
  22  * no branching!
  23  */
  24
  25 #include "math.h"
  26 #include "math_private.h"
  27
  28 #ifdef __STDC__
  29         int __isnanf(float x)
  30 #else
  31         int __isnanf(x)
  32         float x;
  33 #endif
  34 {
  35         int32_t ix;
  36         GET_FLOAT_WORD(ix,x);
  37         ix &= 0x7fffffff;
  38         ix = 0x7f800000 - ix;
  39         return (int)(((u_int32_t)(ix))>>31);
  40 }
  41 weak_alias (__isnanf, isnanf)