1 /*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)mathimpl.h 8.1 (Berkeley) 6/4/93
34 * $FreeBSD$
35 */
36
37 #ifndef _MATHIMPL_H_
38 #define _MATHIMPL_H_
39
40 #include <sys/cdefs.h>
41 #include <math.h>
42
43 #include "../src/math_private.h"
44
45 /*
46 * TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an
47 * IEEE double variable to zero. It must be expression-like for syntactic
48 * reasons, and we implement this expression using an inline function
49 * instead of a pure macro to avoid depending on the gcc feature of
50 * statement-expressions.
51 */
52 #define TRUNC(d) (_b_trunc(&(d)))
53
54 static __inline void
_b_trunc(volatile double * _dp)55 _b_trunc(volatile double *_dp)
56 {
57 uint32_t _lw;
58
59 GET_LOW_WORD(_lw, *_dp);
60 SET_LOW_WORD(*_dp, _lw & 0xf8000000);
61 }
62
63 struct Double {
64 double a;
65 double b;
66 };
67
68 /*
69 * Functions internal to the math package, yet not static.
70 */
71 double __exp__D(double, double);
72 struct Double __log__D(double);
73
74 #endif /* !_MATHIMPL_H_ */
75