1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <math.h> 32 33 #include "fpmath.h" 34 35 /* Provided by libc.so */ 36 #ifndef PIC 37 #undef isnan 38 int 39 isnan(double d) 40 { 41 union IEEEd2bits u; 42 43 u.d = d; 44 return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0)); 45 } 46 #endif /* !PIC */ 47 48 int 49 __isnanf(float f) 50 { 51 union IEEEf2bits u; 52 53 u.f = f; 54 return (u.bits.exp == 255 && u.bits.man != 0); 55 } 56 57 int 58 __isnanl(long double e) 59 { 60 union IEEEl2bits u; 61 62 u.e = e; 63 mask_nbit_l(u); 64 return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0)); 65 } 66 67 __weak_reference(__isnanf, isnanf); 68