sysdeps/ieee754/flt-32/s_isnanf.c

   1 /* s_isnanf.c -- float version of s_isnan.c.
   2  */
   3
   4 /*
   5  * ====================================================
   6  * Copyright (C) 1993, 2011 by Sun Microsystems, Inc. All rights reserved.
   7  *
   8  * Developed at SunPro, a Sun Microsystems, Inc. business.
   9  * Permission to use, copy, modify, and distribute this
  10  * software is freely granted, provided that this notice
  11  * is preserved.
  12  * ====================================================
  13  */
  14
  15 #if defined(LIBM_SCCS) && !defined(lint)
  16 static char rcsid[] = "$NetBSD: s_isnanf.c,v 1.4 1995/05/10 20:47:38 jtc Exp $";
  17 #endif
  18
  19 /*
  20  * isnanf(x) returns 1 is x is nan, else 0;
  21  * no branching!
  22  */
  23
  24 #include <math.h>
  25 #include <math_private.h>
  26
  27 #undef __isnanf
  28 int __isnanf(float x)
  29 {
  30         int32_t ix;
  31         GET_FLOAT_WORD(ix,x);
  32         ix &= 0x7fffffff;
  33         ix = 0x7f800000 - ix;
  34         return (int)(((uint32_t)(ix))>>31);
  35 }
  36 hidden_def (__isnanf)
  37 weak_alias (__isnanf, isnanf)