mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/* 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>
|
|
|
|
#define __sin __sin_local
|
|
#define __cos __cos_local
|
|
#define IN_SINCOS 1
|
|
#include "s_sin.c"
|
|
|
|
/* Consolidated version of reduce_and_compute in s_sin.c that does range
|
|
reduction only once and computes sin and cos together. */
|
|
static inline void
|
|
__always_inline
|
|
reduce_and_compute_sincos (double x, double *sinx, double *cosx)
|
|
{
|
|
double a, da;
|
|
unsigned int n = __branred (x, &a, &da);
|
|
|
|
n = n & 3;
|
|
|
|
if (n == 1 || n == 2)
|
|
{
|
|
a = -a;
|
|
da = -da;
|
|
}
|
|
|
|
if (n & 1)
|
|
{
|
|
double *temp = cosx;
|
|
cosx = sinx;
|
|
sinx = temp;
|
|
}
|
|
|
|
if (a * a < 0.01588)
|
|
*sinx = bsloww (a, da, x, n);
|
|
else
|
|
*sinx = bsloww1 (a, da, x, n);
|
|
*cosx = bsloww2 (a, da, x, n);
|
|
}
|
|
|
|
void
|
|
__sincos (double x, double *sinx, double *cosx)
|
|
{
|
|
mynumber u;
|
|
int k;
|
|
|
|
SET_RESTORE_ROUND_53BIT (FE_TONEAREST);
|
|
|
|
u.x = x;
|
|
k = 0x7fffffff & u.i[HIGH_HALF];
|
|
|
|
if (k < 0x400368fd)
|
|
{
|
|
*sinx = __sin_local (x);
|
|
*cosx = __cos_local (x);
|
|
return;
|
|
}
|
|
if (k < 0x419921FB)
|
|
{
|
|
double a, da;
|
|
int4 n = reduce_sincos_1 (x, &a, &da);
|
|
|
|
*sinx = do_sincos_1 (a, da, x, n, 0);
|
|
*cosx = do_sincos_1 (a, da, x, n, 1);
|
|
|
|
return;
|
|
}
|
|
if (k < 0x42F00000)
|
|
{
|
|
double a, da;
|
|
int4 n = reduce_sincos_2 (x, &a, &da);
|
|
|
|
*sinx = do_sincos_2 (a, da, x, n, 0);
|
|
*cosx = do_sincos_2 (a, da, x, n, 1);
|
|
|
|
return;
|
|
}
|
|
if (k < 0x7ff00000)
|
|
{
|
|
reduce_and_compute_sincos (x, sinx, cosx);
|
|
return;
|
|
}
|
|
|
|
if (isinf (x))
|
|
__set_errno (EDOM);
|
|
|
|
*sinx = *cosx = x / x;
|
|
}
|
|
weak_alias (__sincos, sincos)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__sincos, __sincosl)
|
|
weak_alias (__sincos, sincosl)
|
|
#endif
|