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114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/* Compute sine and cosine of argument.
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Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <math.h>
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#include <math_private.h>
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#define __sin __sin_local
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#define __cos __cos_local
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#define IN_SINCOS 1
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#include "s_sin.c"
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/* Consolidated version of reduce_and_compute in s_sin.c that does range
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reduction only once and computes sin and cos together. */
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static inline void
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__always_inline
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reduce_and_compute_sincos (double x, double *sinx, double *cosx)
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{
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double a, da;
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unsigned int n = __branred (x, &a, &da);
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n = n & 3;
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if (n == 1 || n == 2)
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{
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a = -a;
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da = -da;
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}
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if (n & 1)
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{
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double *temp = cosx;
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cosx = sinx;
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sinx = temp;
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}
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if (a * a < 0.01588)
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*sinx = bsloww (a, da, x, n);
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else
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*sinx = bsloww1 (a, da, x, n);
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*cosx = bsloww2 (a, da, x, n);
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}
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void
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__sincos (double x, double *sinx, double *cosx)
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{
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mynumber u;
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int k;
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SET_RESTORE_ROUND_53BIT (FE_TONEAREST);
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u.x = x;
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k = 0x7fffffff & u.i[HIGH_HALF];
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if (k < 0x400368fd)
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{
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*sinx = __sin_local (x);
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*cosx = __cos_local (x);
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return;
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}
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if (k < 0x419921FB)
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{
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double a, da;
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int4 n = reduce_sincos_1 (x, &a, &da);
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*sinx = do_sincos_1 (a, da, x, n, 0);
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*cosx = do_sincos_1 (a, da, x, n, 1);
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return;
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}
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if (k < 0x42F00000)
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{
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double a, da;
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int4 n = reduce_sincos_2 (x, &a, &da);
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*sinx = do_sincos_2 (a, da, x, n, 0);
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*cosx = do_sincos_2 (a, da, x, n, 1);
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return;
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}
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if (k < 0x7ff00000)
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{
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reduce_and_compute_sincos (x, sinx, cosx);
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return;
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}
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if (isinf (x))
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__set_errno (EDOM);
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*sinx = *cosx = x / x;
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}
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weak_alias (__sincos, sincos)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__sincos, __sincosl)
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weak_alias (__sincos, sincosl)
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#endif
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