1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <apps/math.h>
#include <float.h>
float asinf(float x) {
long double y, y_sin, y_cos;
y = 0;
while (1) {
y_sin = sinf(y);
y_cos = cosf(y);
if (y > M_PI_2 || y < -M_PI_2) {
y = fmodf(y, M_PI);
}
if (y_sin + DBL_EPSILON >= x && y_sin - DBL_EPSILON <= x) {
break;
}
y = y - (y_sin - x) / y_cos;
}
return y;
}
double asin(double x) {
long double y, y_sin, y_cos;
y = 0;
while (1) {
y_sin = sin(y);
y_cos = cos(y);
if (y > M_PI_2 || y < -M_PI_2) {
y = fmod(y, M_PI);
}
if (y_sin + DBL_EPSILON >= x && y_sin - DBL_EPSILON <= x) {
break;
}
y = y - (y_sin - x) / y_cos;
}
return y;
}
long double asinl(long double x) {
long double y, y_sin, y_cos;
y = 0;
while (1) {
y_sin = sinl(y);
y_cos = cosl(y);
if (y > M_PI_2 || y < -M_PI_2) {
y = fmodl(y, M_PI);
}
if (y_sin + LDBL_EPSILON >= x && y_sin - LDBL_EPSILON <= x) {
break;
}
y = y - (y_sin - x) / y_cos;
}
return y;
}
|
