1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #ifndef _MATHIMPL_H_
37 #define _MATHIMPL_H_
38
39 #include <math.h>
40
41 #include "../src/math_private.h"
42
43 /*
44 * TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an
45 * IEEE double variable to zero. It must be expression-like for syntactic
46 * reasons, and we implement this expression using an inline function
47 * instead of a pure macro to avoid depending on the gcc feature of
48 * statement-expressions.
49 */
50 #define TRUNC(d) (_b_trunc(&(d)))
51
52 static __inline void
_b_trunc(volatile double * _dp)53 _b_trunc(volatile double *_dp)
54 {
55 uint32_t _lw;
56
57 GET_LOW_WORD(_lw, *_dp);
58 SET_LOW_WORD(*_dp, _lw & 0xf8000000);
59 }
60
61 struct Double {
62 double a;
63 double b;
64 };
65
66 /*
67 * Functions internal to the math package, yet not static.
68 */
69 double __exp__D(double, double);
70 struct Double __log__D(double);
71
72 #endif /* !_MATHIMPL_H_ */
73