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
imprecise_powl(long double x,long double y)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