k_sinf.c revision 151620 
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#ifndef lint
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_sinf.c 151620 2005-10-24 14:08:36Z bde $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23static const float
24half =  5.0000000000e-01,/* 0x3f000000 */
25S1  = -1.6666667163e-01, /* 0xbe2aaaab */
26S2  =  8.3333337680e-03, /* 0x3c088889 */
27S3  = -1.9841270114e-04, /* 0xb9500d01 */
28S4  =  2.7557314297e-06, /* 0x3638ef1b */
29S5  = -2.5050759689e-08, /* 0xb2d72f34 */
30S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
31
32float
33__kernel_sinf(float x, float y, int iy)
34{
35	float z,r,v;
36
37	z	=  x*x;
38	v	=  z*x;
39	r	=  S2+z*(S3+z*(S4+z*(S5+z*S6)));
40	if(iy==0) return x+v*(S1+z*r);
41	else      return x-((z*(half*y-v*r)-y)-v*S1);
42}
43