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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* Compute sine and cosine of argument.
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Copyright (C) 1997,1999,2004,2006 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 and
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Jakub Jelinek <jj@ultra.linux.cz>.
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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 <math.h>
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#include <math_private.h>
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#include <math_ldbl_opt.h>
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void
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__sincosl (long double x, long double *sinx, long double *cosx)
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{
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int64_t ix;
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/* High word of x. */
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GET_LDOUBLE_MSW64 (ix, x);
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/* |x| ~< pi/4 */
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ix &= 0x7fffffffffffffffLL;
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if (ix <= 0x3fe921fb54442d10LL)
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__kernel_sincosl (x, 0.0L, sinx, cosx, 0);
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else if (ix >= 0x7ff0000000000000LL)
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{
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/* sin(Inf or NaN) is NaN */
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*sinx = *cosx = x - x;
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}
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else
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{
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/* Argument reduction needed. */
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long double y[2];
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int n;
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n = __ieee754_rem_pio2l (x, y);
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switch (n & 3)
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{
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case 0:
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__kernel_sincosl (y[0], y[1], sinx, cosx, 1);
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break;
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case 1:
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__kernel_sincosl (y[0], y[1], cosx, sinx, 1);
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*cosx = -*cosx;
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break;
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case 2:
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__kernel_sincosl (y[0], y[1], sinx, cosx, 1);
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*sinx = -*sinx;
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*cosx = -*cosx;
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break;
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default:
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__kernel_sincosl (y[0], y[1], cosx, sinx, 1);
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*sinx = -*sinx;
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break;
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}
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}
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}
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long_double_symbol (libm, __sincosl, sincosl);
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