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 * @(#)mathimpl.h 8.1 (Berkeley) 6/4/93
36 * $FreeBSD: head/lib/msun/bsdsrc/mathimpl.h 325966 2017-11-18 14:26:50Z pfg $
37 */
38
39 #ifndef _MATHIMPL_H_
40 #define _MATHIMPL_H_
41
42 #include <sys/cdefs.h>
43 #include <math.h>
44
45 #include "../src/math_private.h"
46
47 /*
48 * TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an
49 * IEEE double variable to zero. It must be expression-like for syntactic
50 * reasons, and we implement this expression using an inline function
51 * instead of a pure macro to avoid depending on the gcc feature of
52 * statement-expressions.
53 */
54 #define TRUNC(d) (_b_trunc(&(d)))
55
56 static __inline void
_b_trunc(volatile double * _dp)57 _b_trunc(volatile double *_dp)
58 {
59 uint32_t _lw;
60
61 GET_LOW_WORD(_lw, *_dp);
62 SET_LOW_WORD(*_dp, _lw & 0xf8000000);
63 }
64
65 struct Double {
66 double a;
67 double b;
68 };
69
70 /*
71 * Functions internal to the math package, yet not static.
72 */
73 double __exp__D(double, double);
74 struct Double __log__D(double);
75
76 #endif /* !_MATHIMPL_H_ */
77