2 * Copyright (c) 2013 David Chisnall
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: head/lib/msun/src/imprecise.c 255294 2013-09-06 07:58:23Z theraven $
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
37 #if (LDBL_MANT_DIG > 53)
38 #define WARN_IMPRECISE(x) \
39 __warn_references(x, # x " has lower than advertised precision");
41 #define WARN_IMPRECISE(x)
44 * Declare the functions as weak variants so that other libraries providing
45 * real versions can override them.
47 #define DECLARE_WEAK(x)\
48 __weak_reference(imprecise_## x, x);\
51 #define DECLARE_FORMER_IMPRECISE(f) \
52 __asm__(".symver imprecise_" #f "l," #f "l@DF306.1"); \
53 long double imprecise_ ## f ## l(long double v) { return f(v); }
55 #pragma GCC diagnostic push
56 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
58 __asm__(".symver imprecise_powl,powl@DF306.1");
60 imprecise_powl(long double x, long double y) { return pow(x, y); }
62 DECLARE_FORMER_IMPRECISE(cosh);
63 DECLARE_FORMER_IMPRECISE(erfc);
64 DECLARE_FORMER_IMPRECISE(erf);
65 DECLARE_FORMER_IMPRECISE(sinh);
66 DECLARE_FORMER_IMPRECISE(tanh);
67 DECLARE_FORMER_IMPRECISE(tgamma);
68 DECLARE_FORMER_IMPRECISE(lgamma);
70 #pragma GCC diagnostic pop