s_isnan.c - vx32 - Local 9vx git repository for patches.
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       ---
       s_isnan.c (1761B)
       ---
            1 /*-
            2  * Copyright (c) 2004 David Schultz <das@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: src/lib/msun/src/s_isnan.c,v 1.8 2004/08/05 01:46:11 das Exp $
           27  */
           28 
           29 #include <math.h>
           30 
           31 #include "math_private.h"
           32 
           33 /* Provided by libc */
           34 int
           35 vx32_isnan(double d)
           36 {
           37         union IEEEd2bits u;
           38 
           39         u.d = d;
           40         return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
           41 }
           42 
           43 int
           44 isnanf(float f)
           45 {
           46         union IEEEf2bits u;
           47 
           48         u.f = f;
           49         return (u.bits.exp == 255 && u.bits.man != 0);
           50 }
           51