1/* k_sinf.c -- float version of k_sin.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#include <sys/cdefs.h>
17#if defined(LIBM_SCCS) && !defined(lint)
18__RCSID("$NetBSD: k_sinf.c,v 1.6 1999/07/02 15:37:41 simonb Exp $");
19#endif
20
21#include "math.h"
22#include "math_private.h"
23
24static const float
25half =  5.0000000000e-01,/* 0x3f000000 */
26S1  = -1.6666667163e-01, /* 0xbe2aaaab */
27S2  =  8.3333337680e-03, /* 0x3c088889 */
28S3  = -1.9841270114e-04, /* 0xb9500d01 */
29S4  =  2.7557314297e-06, /* 0x3638ef1b */
30S5  = -2.5050759689e-08, /* 0xb2d72f34 */
31S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
32
33float
34__kernel_sinf(float x, float y, int iy)
35{
36	float z,r,v;
37	int32_t ix;
38	GET_FLOAT_WORD(ix,x);
39	ix &= 0x7fffffff;			/* high word of x */
40	if(ix<0x32000000)			/* |x| < 2**-27 */
41	   {if((int)x==0) return x;}		/* generate inexact */
42	z	=  x*x;
43	v	=  z*x;
44	r	=  S2+z*(S3+z*(S4+z*(S5+z*S6)));
45	if(iy==0) return x+v*(S1+z*r);
46	else      return x-((z*(half*y-v*r)-y)-v*S1);
47}
48