text: /*
   * CDDL HEADER START
   *
   * The contents of this file are subject to the terms of the
   * Common Development and Distribution License (the "License").
   * You may not use this file except in compliance with the License.
   *
   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   * or http://www.opensolaris.org/os/licensing.
   * See the License for the specific language governing permissions
   * and limitations under the License.
   *
   * When distributing Covered Code, include this CDDL HEADER in each
   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   * If applicable, add the following below this CDDL HEADER, with the
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  
  /*
   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
   */
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #pragma weak __sinl = sinl
  
  /* INDENT OFF */
  /* sinl(x)
   * Table look-up algorithm by K.C. Ng, November, 1989.
   *
   * kernel function:
   *	__k_sinl		... sin function on [-pi/4,pi/4]
   *	__k_cosl		... cos function on [-pi/4,pi/4]
   *	__rem_pio2l	... argument reduction routine
   *
   * Method.
   *      Let S and C denote the sin and cos respectively on [-PI/4, +PI/4].
   *      1. Assume the argument x is reduced to y1+y2 = x-k*pi/2 in
   *	   [-pi/2 , +pi/2], and let n = k mod 4.
   *	2. Let S=S(y1+y2), C=C(y1+y2). Depending on n, we have
   *
   *          n        sin(x)      cos(x)        tan(x)
   *     ----------------------------------------------------------
   *	    0	       S	   C		 S/C
   *	    1	       C	  -S		-C/S
   *	    2	      -S	  -C		 S/C
   *	    3	      -C	   S		-C/S
   *     ----------------------------------------------------------
   *
   * Special cases:
   *      Let trig be any of sin, cos, or tan.
   *      trig(+-INF)  is NaN, with signals;
   *      trig(NaN)    is that NaN;
   *
   * Accuracy:
   *	computer TRIG(x) returns trig(x) nearly rounded.
   */
  /* INDENT ON */
  
  #include "libm.h"
  #include "longdouble.h"
  
  #include <sys/isa_defs.h>
  
  long double
  sinl(long double x) {
  	long double y[2], z = 0.0L;
  	int n, ix;
  #if defined(__i386) || defined(__amd64)
  	int *px = (int *) &x;
  #endif
  
  	/* sin(Inf or NaN) is NaN */
  	if (!finitel(x))
  		return x - x;
  
  	/* High word of x. */
  #if defined(__i386) || defined(__amd64)
  	XTOI(px, ix);
  #else
  	ix = *(int *) &x;
  #endif
  	/* |x| ~< pi/4 */
  	ix &= 0x7fffffff;
  	if (ix <= 0x3ffe9220)
  		return __k_sinl(x, z);
  
  	/* argument reduction needed */
  	else {
  		n = __rem_pio2l(x, y);
  		switch (n & 3) {
  		case 0:
  			return __k_sinl(y[0], y[1]);
  		case 1:
  			return __k_cosl(y[0], y[1]);
  		case 2:
  			return -__k_sinl(y[0], y[1]);
  		case 3:
  			return -__k_cosl(y[0], y[1]);
  		/* NOTREACHED */
  		}
  	}
  	return 0.0L;
  }
  