Replace hybrid libm with OpenBSD libm on vendor branch
[dragonfly.git] / lib / libm / src / imprecise.c
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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: head/lib/msun/src/imprecise.c 255294 2013-09-06 07:58:23Z theraven $
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
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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); }
54
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55#pragma GCC diagnostic push
56#pragma GCC diagnostic ignored "-Wmissing-prototypes"
57
58__asm__(".symver imprecise_powl,powl@DF306.1");
59long double
60imprecise_powl(long double x, long double y) { return pow(x, y); }
967141b1 61
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62DECLARE_FORMER_IMPRECISE(cosh);
63DECLARE_FORMER_IMPRECISE(erfc);
64DECLARE_FORMER_IMPRECISE(erf);
65DECLARE_FORMER_IMPRECISE(sinh);
66DECLARE_FORMER_IMPRECISE(tanh);
67DECLARE_FORMER_IMPRECISE(tgamma);
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68DECLARE_FORMER_IMPRECISE(lgamma);
69
70#pragma GCC diagnostic pop