libm/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 /*
  17  * isnanf(x) returns 1 is x is nan, else 0;
  18  * no branching!
  19  */
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24 int __isnanf(float x)
  25 {
  26         int32_t ix;
  27         GET_FLOAT_WORD(ix,x);
  28         ix &= 0x7fffffff;
  29         ix = 0x7f800000 - ix;
  30         return (int)(((u_int32_t)(ix))>>31);
  31 }
  32 libm_hidden_def(__isnanf)