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s_isnanf.c revision 1.5 
      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 #include <sys/cdefs.h>
     17 #if defined(LIBM_SCCS) && !defined(lint)
     18 __RCSID("$NetBSD: s_isnanf.c,v 1.5 1997/10/09 11:32:30 lukem Exp $");
     19 #endif
     20 
     21 /*
     22  * isnanf(x) returns 1 is x is nan, else 0;
     23  * no branching!
     24  */
     25 
     26 #include "math.h"
     27 #include "math_private.h"
     28 
     29 #ifdef __STDC__
     30 	int isnanf(float x)
     31 #else
     32 	int isnanf(x)
     33 	float x;
     34 #endif
     35 {
     36 	int32_t ix;
     37 	GET_FLOAT_WORD(ix,x);
     38 	ix &= 0x7fffffff;
     39 	ix = 0x7f800000 - ix;
     40 	return (int)(((u_int32_t)(ix))>>31);
     41 }
     42