k_sinf.c revision 8870 
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[] = "$Id: k_sinf.c,v 1.1.1.1 1994/08/19 09:39:57 jkh Exp $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23#ifdef __STDC__
24static const float
25#else
26static float
27#endif
28half =  5.0000000000e-01,/* 0x3f000000 */
29S1  = -1.6666667163e-01, /* 0xbe2aaaab */
30S2  =  8.3333337680e-03, /* 0x3c088889 */
31S3  = -1.9841270114e-04, /* 0xb9500d01 */
32S4  =  2.7557314297e-06, /* 0x3638ef1b */
33S5  = -2.5050759689e-08, /* 0xb2d72f34 */
34S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
35
36#ifdef __STDC__
37	float __kernel_sinf(float x, float y, int iy)
38#else
39	float __kernel_sinf(x, y, iy)
40	float x,y; int iy;		/* iy=0 if y is zero */
41#endif
42{
43	float z,r,v;
44	int32_t ix;
45	GET_FLOAT_WORD(ix,x);
46	ix &= 0x7fffffff;			/* high word of x */
47	if(ix<0x32000000)			/* |x| < 2**-27 */
48	   {if((int)x==0) return x;}		/* generate inexact */
49	z	=  x*x;
50	v	=  z*x;
51	r	=  S2+z*(S3+z*(S4+z*(S5+z*S6)));
52	if(iy==0) return x+v*(S1+z*r);
53	else      return x-((z*(half*y-v*r)-y)-v*S1);
54}
55