1 /*-
2 * Copyright (c) 2015 Dag-Erling Smørgrav
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
30 typedef 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 */
40 static inline fp16_t
fp16_add(fp16_t a,fp16_t b)41 fp16_add(fp16_t a, fp16_t b)
42 {
43
44 return (a + b);
45 }
46
47 /* subtract b from a */
48 static inline fp16_t
fp16_sub(fp16_t a,fp16_t b)49 fp16_sub(fp16_t a, fp16_t b)
50 {
51
52 return (a - b);
53 }
54
55 /* multiply a by b */
56 static inline fp16_t
fp16_mul(fp16_t a,fp16_t b)57 fp16_mul(fp16_t a, fp16_t b)
58 {
59
60 return (a * b >> 16);
61 }
62
63 /* divide a by b */
64 static inline fp16_t
fp16_div(fp16_t a,fp16_t b)65 fp16_div(fp16_t a, fp16_t b)
66 {
67
68 return ((a << 16) / b);
69 }
70
71 /* square root */
72 fp16_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 */
80 fp16_t fp16_sin(fp16_t);
81 fp16_t fp16_cos(fp16_t);
82
83 #endif
84