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s_isnanf.c revision 1.1 
      1 /* s_isnanf.c -- float version of s_isnan.c.
      2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) 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 #ifndef lint
     17 static char rcsid[] = "$Id: s_isnanf.c,v 1.1 1994/08/10 20:32:36 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 	int ix;
     36 	GET_FLOAT_WORD(ix,x);
     37 	ix &= 0x7fffffff;
     38 	ix = 0x7f800000 - ix;
     39 	return ((unsigned)(ix))>>31;
     40 }
     41