1/*-
2 * Copyright (c) 2015 Dag-Erling Sm��rgrav
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
27#ifndef FP16_H_INCLUDED
28#define FP16_H_INCLUDED
29
30typedef signed long long fp16_t;
31
32#define ItoFP16(n)	((signed long long)(n) << 16)
33#define FP16toI(n)	((signed long long)(n) >> 16)
34
35#ifndef _KERNEL
36#define FP16toF(n)	((n) / 65536.0)
37#endif
38
39/* add a and b */
40static inline fp16_t
41fp16_add(fp16_t a, fp16_t b)
42{
43
44	return (a + b);
45}
46
47/* subtract b from a */
48static inline fp16_t
49fp16_sub(fp16_t a, fp16_t b)
50{
51
52	return (a - b);
53}
54
55/* multiply a by b */
56static inline fp16_t
57fp16_mul(fp16_t a, fp16_t b)
58{
59
60	return (a * b >> 16);
61}
62
63/* divide a by b */
64static inline fp16_t
65fp16_div(fp16_t a, fp16_t b)
66{
67
68	return ((a << 16) / b);
69}
70
71/* square root */
72fp16_t fp16_sqrt(fp16_t);
73
74#define FP16_2PI	 411774
75#define FP16_PI		 205887
76#define FP16_PI_2	 102943
77#define FP16_PI_4	  51471
78
79/* sine and cosine */
80fp16_t fp16_sin(fp16_t);
81fp16_t fp16_cos(fp16_t);
82
83#endif
84