| Calin Juravle | 1abc9ff | 2014-04-17 18:17:32 +0100 | [diff] [blame] | 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 | |
| Calin Juravle | 1abc9ff | 2014-04-17 18:17:32 +0100 | [diff] [blame] | 63 | DECLARE_IMPRECISE(tgamma); |