mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 11:30:06 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Compute sine and cosine of argument.
|
|
Copyright (C) 1997, 2000 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <math.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
|
|
void
|
|
__sincosf (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;
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
weak_alias (__sincosf, sincosf)
|