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
|
/* Compute sine and cosine of argument.
Copyright (C) 1997-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <math.h>
#include <math_private.h>
#ifndef SINCOSF
# define SINCOSF_FUNC __sincosf
#else
# define SINCOSF_FUNC SINCOSF
#endif
void
SINCOSF_FUNC (float x, float *sinx, float *cosx)
{
int32_t ix;
/* High word of x. */
GET_FLOAT_WORD (ix, x);
/* |x| ~< pi/4 */
ix &= 0x7fffffff;
if (ix <= 0x3f490fd8)
{
*sinx = __kernel_sinf (x, 0.0, 0);
*cosx = __kernel_cosf (x, 0.0);
}
else if (ix>=0x7f800000)
{
/* sin(Inf or NaN) is NaN */
*sinx = *cosx = x - x;
if (ix == 0x7f800000)
__set_errno (EDOM);
}
else
{
/* Argument reduction needed. */
float y[2];
int n;
n = __ieee754_rem_pio2f (x, y);
switch (n & 3)
{
case 0:
*sinx = __kernel_sinf (y[0], y[1], 1);
*cosx = __kernel_cosf (y[0], y[1]);
break;
case 1:
*sinx = __kernel_cosf (y[0], y[1]);
*cosx = -__kernel_sinf (y[0], y[1], 1);
break;
case 2:
*sinx = -__kernel_sinf (y[0], y[1], 1);
*cosx = -__kernel_cosf (y[0], y[1]);
break;
default:
*sinx = -__kernel_cosf (y[0], y[1]);
*cosx = __kernel_sinf (y[0], y[1], 1);
break;
}
}
}
#ifndef SINCOSF
weak_alias (__sincosf, sincosf)
#endif
|
