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/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*
* ## Notice
*
* The following copyright, license, and long comment were part of the original implementation available as part of [FreeBSD]{@link https://svnweb.freebsd.org/base/release/9.3.0/lib/msun/src/k_sin.c}. The implementation follows the original, but has been modified for JavaScript.
*
* ```text
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ```
*/
'use strict';
// VARIABLES //
var S1 = -1.66666666666666324348e-01; // 0xBFC55555, 0x55555549
var S2 = 8.33333333332248946124e-03; // 0x3F811111, 0x1110F8A6
var S3 = -1.98412698298579493134e-04; // 0xBF2A01A0, 0x19C161D5
var S4 = 2.75573137070700676789e-06; // 0x3EC71DE3, 0x57B1FE7D
var S5 = -2.50507602534068634195e-08; // 0xBE5AE5E6, 0x8A2B9CEB
var S6 = 1.58969099521155010221e-10; // 0x3DE5D93A, 0x5ACFD57C
// MAIN //
/**
* Computes the sine on \\( \approx \[-\pi/4, \pi/4] \\) (except on \\(-0\\)), where \\( \pi/4 \approx 0.7854 \\).
*
* ## Method
*
* - Since \\( \sin(-x) = -\sin(x) \\), we need only to consider positive \\(x\\).
*
* - Callers must return \\( \sin(-0) = -0 \\) without calling here since our odd polynomial is not evaluated in a way that preserves \\(-0\\). Callers may do the optimization \\( \sin(x) \approx x \\) for tiny \\(x\\).
*
* - \\( \sin(x) \\) is approximated by a polynomial of degree \\(13\\) on \\( \left\[0,\tfrac{pi}{4}\right] \\)
*
* ```tex
* \sin(x) \approx x + S_1 \cdot x^3 + \ldots + S_6 \cdot x^{13}
* ```
*
* where
*
* ```tex
* \left| \frac{\sin(x)}{x} \left( 1 + S_1 \cdot x + S_2 \cdot x + S_3 \cdot x + S_4 \cdot x + S_5 \cdot x + S_6 \cdot x \right) \right| \le 2^{-58}
* ```
*
* - We have
*
* ```tex
* \sin(x+y) = \sin(x) + \sin'(x') \cdot y \approx \sin(x) + (1-x*x/2) \cdot y
* ```
*
* For better accuracy, let
*
* ```tex
* r = x^3 * \left( S_2 + x^2 \cdot \left( S_3 + x^2 * \left( S_4 + x^2 \cdot ( S_5+x^2 \cdot S_6 ) \right) \right) \right)
* ```
*
* then
*
* ```tex
* \sin(x) = x + \left( S_1 \cdot x + ( x \cdot (r-y/2) + y ) \right)
* ```
*
*
* @param {number} x - input value (in radians, assumed to be bounded by `~pi/4` in magnitude)
* @param {number} y - tail of `x`
* @returns {number} sine
*
* @example
* var v = kernelSin( 0.0, 0.0 );
* // returns ~0.0
*
* @example
* var v = kernelSin( 3.141592653589793/6.0, 0.0 );
* // returns ~0.5
*
* @example
* var v = kernelSin( 0.619, 9.279e-18 );
* // returns ~0.58
*
* @example
* var v = kernelSin( NaN, 0.0 );
* // returns NaN
*
* @example
* var v = kernelSin( 3.0, NaN );
* // returns NaN
*
* @example
* var v = kernelSin( NaN, NaN );
* // returns NaN
*/
function kernelSin( x, y ) {
var r;
var v;
var w;
var z;
z = x * x;
w = z * z;
r = S2 + (z * (S3 + (z*S4))) + (z * w * (S5 + (z*S6)));
v = z * x;
if ( y === 0.0 ) {
return x + (v * (S1 + (z*r)));
}
return x - (((z*((0.5*y) - (v*r))) - y) - (v*S1));
}
// EXPORTS //
module.exports = kernelSin;
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