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 /* 36 * XXX These routines belong in libm, but they must remain in libc for 37 * binary compat until we can bump libm's major version number. 38 * 39 * Note this only applies to the dynamic versions of libm and libc, so 40 * for the static and profiled versions we stub out the definitions. 41 * Otherwise you cannot link statically to libm and libc at the same 42 * time, when calling both functions. 43 */ 44 45 #ifdef PIC 46 __weak_reference(__isnan, isnan); 47 __weak_reference(__isnanf, isnanf); 48 49 int 50 __isnan(double d) 51 { 52 union IEEEd2bits u; 53 54 u.d = d; 55 return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0)); 56 } 57 58 int 59 __isnanf(float f) 60 { 61 union IEEEf2bits u; 62 63 u.f = f; 64 return (u.bits.exp == 255 && u.bits.man != 0); 65 } 66 #endif /* PIC */ 67