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#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: k_sinf.c,v 1.4 1995/05/10 20:46:33 jtc Exp $";
18#endif
19
20#include <float.h>
21#include <math.h>
22#include <math_private.h>
23#include <math-underflow.h>
24
25static const float
26half = 5.0000000000e-01,/* 0x3f000000 */
27S1 = -1.6666667163e-01, /* 0xbe2aaaab */
28S2 = 8.3333337680e-03, /* 0x3c088889 */
29S3 = -1.9841270114e-04, /* 0xb9500d01 */
30S4 = 2.7557314297e-06, /* 0x3638ef1b */
31S5 = -2.5050759689e-08, /* 0xb2d72f34 */
32S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */
33
34float __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 {
42 math_check_force_underflow (x);
43 if ((int) x == 0)
44 return x; /* generate inexact */
45 }
46 z = x*x;
47 v = z*x;
48 r = S2+z*(S3+z*(S4+z*(S5+z*S6)));
49 if(iy==0) return x+v*(S1+z*r);
50 else return x-((z*(half*y-v*r)-y)-v*S1);
51}
52