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: 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 "fpmath.h" 32 33 /* Provided by libc */ 34 #if 1 35 int 36 (isnan)(double d) 37 { 38 union IEEEd2bits u; 39 40 u.d = d; 41 return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0)); 42 } 43 #endif 44 45 int 46 isnanf(float f) 47 { 48 union IEEEf2bits u; 49 50 u.f = f; 51 return (u.bits.exp == 255 && u.bits.man != 0); 52 } 53 54 int 55 __isnanl(long double e) 56 { 57 union IEEEl2bits u; 58 59 u.e = e; 60 mask_nbit_l(u); 61 return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0)); 62 } 63
