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      1 /*-
      2  * Copyright (c) 2004 David Schultz <das (at) FreeBSD.ORG>
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     24  * SUCH DAMAGE.
     25  *
     26  * $FreeBSD$
     27  */
     28 
     29 #include <math.h>
     30 
     31 #include "fpmath.h"
     32 
     33 /* Provided by libc.so */
     34 #ifndef PIC
     35 #undef isnan
     36 int
     37 isnan(double d)
     38 {
     39 	union IEEEd2bits u;
     40 
     41 	u.d = d;
     42 	return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
     43 }
     44 #endif /* !PIC */
     45 
     46 int
     47 __isnanf(float f)
     48 {
     49 	union IEEEf2bits u;
     50 
     51 	u.f = f;
     52 	return (u.bits.exp == 255 && u.bits.man != 0);
     53 }
     54 
     55 int
     56 __isnanl(long double e)
     57 {
     58 	union IEEEl2bits u;
     59 
     60 	u.e = e;
     61 	mask_nbit_l(u);
     62 	return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0));
     63 }
     64 
     65 __weak_reference(__isnanf, isnanf);
     66