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#include <sys/cdefs.h>
19__FBSDID("$FreeBSD$");
20#endif
21
22#include "math.h"
23#include "math_private.h"
24
25/* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
26static const double
27S1 = -0x15555554cbac77.0p-55,	/* -0.166666666416265235595 */
28S2 =  0x111110896efbb2.0p-59,	/*  0.0083333293858894631756 */
29S3 = -0x1a00f9e2cae774.0p-65,	/* -0.000198393348360966317347 */
30S4 =  0x16cd878c3b46a7.0p-71;	/*  0.0000027183114939898219064 */
31
32#ifdef INLINE_KERNEL_SINDF
33static __inline
34#endif
35float
36__kernel_sindf(double x)
37{
38	double r, s, w, z;
39
40	/* Try to optimize for parallel evaluation as in k_tanf.c. */
41	z = x*x;
42	w = z*z;
43	r = S3+z*S4;
44	s = z*x;
45	return (x + s*(S1+z*S2)) + s*w*r;
46}
47