k_sinf.c revision 152869 
1/* k_sinf.c -- float version of k_sin.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 * Optimized by Bruce D. Evans.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
17#ifndef INLINE_KERNEL_SINDF
18#ifndef lint
19static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_sinf.c 152869 2005-11-28 04:58:57Z bde $";
20#endif
21#endif
22
23#include "math.h"
24#include "math_private.h"
25
26/* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
27static const double
28S1 = -0x15555554cbac77.0p-55,	/* -0.166666666416265235595 */
29S2 =  0x111110896efbb2.0p-59,	/*  0.0083333293858894631756 */
30S3 = -0x1a00f9e2cae774.0p-65,	/* -0.000198393348360966317347 */
31S4 =  0x16cd878c3b46a7.0p-71;	/*  0.0000027183114939898219064 */
32
33#ifdef INLINE_KERNEL_SINDF
34extern inline
35#endif
36float
37__kernel_sindf(double x)
38{
39	double z,r,v;
40
41	z	=  x*x;
42	v	=  z*x;
43	r	=  S2+z*(S3+z*S4);
44	return x+v*(S1+z*r);
45}
46