1 /*- 2 * Copyright (c) 2013 David Chisnall 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 * $FreeBSD$ 27 */ 28 29 #include <float.h> 30 #include <math.h> 31 32 /* 33 * If long double is not the same size as double, then these will lose 34 * precision and we should emit a warning whenever something links against 35 * them. 36 */ 37 #if (LDBL_MANT_DIG > 53) 38 #define WARN_IMPRECISE(x) \ 39 __warn_references(x, # x " has lower than advertised precision"); 40 #else 41 #define WARN_IMPRECISE(x) 42 #endif 43 /* 44 * Declare the functions as weak variants so that other libraries providing 45 * real versions can override them. 46 */ 47 #define DECLARE_WEAK(x)\ 48 __weak_reference(imprecise_## x, x);\ 49 WARN_IMPRECISE(x) 50 51 long double 52 imprecise_powl(long double x, long double y) 53 { 54 55 return pow(x, y); 56 } 57 DECLARE_WEAK(powl); 58 59 #define DECLARE_IMPRECISE(f) \ 60 long double imprecise_ ## f ## l(long double v) { return f(v); }\ 61 DECLARE_WEAK(f ## l) 62 63 DECLARE_IMPRECISE(tgamma); 64
