1f9f848faSopenharmony_ci/* From: @(#)k_sin.c 1.3 95/01/18 */
2f9f848faSopenharmony_ci/*
3f9f848faSopenharmony_ci * ====================================================
4f9f848faSopenharmony_ci * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5f9f848faSopenharmony_ci * Copyright (c) 2008 Steven G. Kargl, David Schultz, Bruce D. Evans.
6f9f848faSopenharmony_ci *
7f9f848faSopenharmony_ci * Developed at SunSoft, a Sun Microsystems, Inc. business.
8f9f848faSopenharmony_ci * Permission to use, copy, modify, and distribute this
9f9f848faSopenharmony_ci * software is freely granted, provided that this notice
10f9f848faSopenharmony_ci * is preserved.
11f9f848faSopenharmony_ci * ====================================================
12f9f848faSopenharmony_ci */
13f9f848faSopenharmony_ci
14f9f848faSopenharmony_ci#include <sys/cdefs.h>
15f9f848faSopenharmony_ci/*
16f9f848faSopenharmony_ci * ld128 version of k_sin.c.  See ../src/k_sin.c for most comments.
17f9f848faSopenharmony_ci */
18f9f848faSopenharmony_ci
19f9f848faSopenharmony_ci#include "math_private.h"
20f9f848faSopenharmony_ci
21f9f848faSopenharmony_cistatic const double
22f9f848faSopenharmony_cihalf =  0.5;
23f9f848faSopenharmony_ci
24f9f848faSopenharmony_ci/*
25f9f848faSopenharmony_ci * Domain [-0.7854, 0.7854], range ~[-1.53e-37, 1.659e-37]
26f9f848faSopenharmony_ci * |sin(x)/x - s(x)| < 2**-122.1
27f9f848faSopenharmony_ci *
28f9f848faSopenharmony_ci * See ../ld80/k_cosl.c for more details about the polynomial.
29f9f848faSopenharmony_ci */
30f9f848faSopenharmony_cistatic const long double
31f9f848faSopenharmony_ciS1 = -0.16666666666666666666666666666666666606732416116558L,
32f9f848faSopenharmony_ciS2 =  0.0083333333333333333333333333333331135404851288270047L,
33f9f848faSopenharmony_ciS3 = -0.00019841269841269841269841269839935785325638310428717L,
34f9f848faSopenharmony_ciS4 =  0.27557319223985890652557316053039946268333231205686e-5L,
35f9f848faSopenharmony_ciS5 = -0.25052108385441718775048214826384312253862930064745e-7L,
36f9f848faSopenharmony_ciS6 =  0.16059043836821614596571832194524392581082444805729e-9L,
37f9f848faSopenharmony_ciS7 = -0.76471637318198151807063387954939213287488216303768e-12L,
38f9f848faSopenharmony_ciS8 =  0.28114572543451292625024967174638477283187397621303e-14L;
39f9f848faSopenharmony_ci
40f9f848faSopenharmony_cistatic const double
41f9f848faSopenharmony_ciS9  = -0.82206352458348947812512122163446202498005154296863e-17,
42f9f848faSopenharmony_ciS10 =  0.19572940011906109418080609928334380560135358385256e-19,
43f9f848faSopenharmony_ciS11 = -0.38680813379701966970673724299207480965452616911420e-22,
44f9f848faSopenharmony_ciS12 =  0.64038150078671872796678569586315881020659912139412e-25;
45f9f848faSopenharmony_ci
46f9f848faSopenharmony_cilong double
47f9f848faSopenharmony_ci__kernel_sinl(long double x, long double y, int iy)
48f9f848faSopenharmony_ci{
49f9f848faSopenharmony_ci	long double z,r,v;
50f9f848faSopenharmony_ci
51f9f848faSopenharmony_ci	z	=  x*x;
52f9f848faSopenharmony_ci	v	=  z*x;
53f9f848faSopenharmony_ci	r	=  S2+z*(S3+z*(S4+z*(S5+z*(S6+z*(S7+z*(S8+
54f9f848faSopenharmony_ci	    z*(S9+z*(S10+z*(S11+z*S12)))))))));
55f9f848faSopenharmony_ci	if(iy==0) return x+v*(S1+z*r);
56f9f848faSopenharmony_ci	else      return x-((z*(half*y-v*r)-y)-v*S1);
57f9f848faSopenharmony_ci}
58