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
54static __inline void
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
63struct Double {
64	double	a;
65	double	b;
66};
67
68/*
69 * Functions internal to the math package, yet not static.
70 */
71double	__exp__D(double, double);
72struct Double __log__D(double);
73
74#endif /* !_MATHIMPL_H_ */
75