1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 David Chisnall 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 <float.h> 32 #include <math.h> 33 34 /* 35 * If long double is not the same size as double, then these will lose 36 * precision and we should emit a warning whenever something links against 37 * them. 38 */ 39 #if (LDBL_MANT_DIG > 53) 40 #define WARN_IMPRECISE(x) \ 41 __warn_references(x, # x " has lower than advertised precision"); 42 #else 43 #define WARN_IMPRECISE(x) 44 #endif 45 /* 46 * Declare the functions as weak variants so that other libraries providing 47 * real versions can override them. 48 */ 49 #define DECLARE_WEAK(x)\ 50 __weak_reference(imprecise_## x, x);\ 51 WARN_IMPRECISE(x) 52 53 #define DECLARE_IMPRECISE(f) \ 54 long double imprecise_ ## f ## l(long double v) { return f(v); }\ 55 DECLARE_WEAK(f ## l) 56 57 DECLARE_IMPRECISE(tgamma); 58