1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 29 #include <math.h> 30 31 #include "fpmath.h" 32 33 /* 34 * XXX These routines belong in libm, but they must remain in libc for 35 * binary compat until we can bump libm's major version number. 36 * 37 * Note this only applies to the dynamic versions of libm and libc, so 38 * for the static and profiled versions we stub out the definitions. 39 * Otherwise you cannot link statically to libm and libc at the same 40 * time, when calling both functions. 41 */ 42 43 #ifdef PIC 44 /* 45 * Because math.h defines __isnan and __isnanf as aliases for compatibility with 46 * glibc and CUDA, we have to undefine them here to avoid redefinition errors. 47 */ 48 #undef __isnan 49 #undef __isnanf 50 51 __weak_reference(__isnan, isnan); 52 __weak_reference(__isnanf, isnanf); 53 54 int 55 __isnan(double d) 56 { 57 union IEEEd2bits u; 58 59 u.d = d; 60 return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0)); 61 } 62 63 int 64 __isnanf(float f) 65 { 66 union IEEEf2bits u; 67 68 u.f = f; 69 return (u.bits.exp == 255 && u.bits.man != 0); 70 } 71 #endif /* PIC */ 72