1/* Compute sine and cosine of argument.
2   Copyright (C) 1997, 2000 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
6   The GNU C Library is free software; you can redistribute it and/or
7   modify it under the terms of the GNU Lesser General Public
8   License as published by the Free Software Foundation; either
9   version 2.1 of the License, or (at your option) any later version.
10
11   The GNU C Library is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public
17   License along with the GNU C Library; if not, write to the Free
18   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19   02111-1307 USA.  */
20
21#include <math.h>
22
23#include "math_private.h"
24
25
26void
27__sincosf (float x, float *sinx, float *cosx)
28{
29  int32_t ix;
30
31  /* High word of x. */
32  GET_FLOAT_WORD (ix, x);
33
34  /* |x| ~< pi/4 */
35  ix &= 0x7fffffff;
36  if (ix <= 0x3f490fd8)
37    {
38      *sinx = __kernel_sinf (x, 0.0, 0);
39      *cosx = __kernel_cosf (x, 0.0);
40    }
41  else if (ix>=0x7f800000)
42    {
43      /* sin(Inf or NaN) is NaN */
44      *sinx = *cosx = x - x;
45    }
46  else
47    {
48      /* Argument reduction needed.  */
49      float y[2];
50      int n;
51
52      n = __ieee754_rem_pio2f (x, y);
53      switch (n & 3)
54	{
55	case 0:
56	  *sinx = __kernel_sinf (y[0], y[1], 1);
57	  *cosx = __kernel_cosf (y[0], y[1]);
58	  break;
59	case 1:
60	  *sinx = __kernel_cosf (y[0], y[1]);
61	  *cosx = -__kernel_sinf (y[0], y[1], 1);
62	  break;
63	case 2:
64	  *sinx = -__kernel_sinf (y[0], y[1], 1);
65	  *cosx = -__kernel_cosf (y[0], y[1]);
66	  break;
67	default:
68	  *sinx = -__kernel_cosf (y[0], y[1]);
69	  *cosx = __kernel_sinf (y[0], y[1], 1);
70	  break;
71	}
72    }
73}
74weak_alias (__sincosf, sincosf)
75