1/* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.c */
 2/*
 3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 4 * Optimized by Bruce D. Evans.
 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#include "libm.h"
18
19/* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
20static const double
21S1 = -0x15555554cbac77.0p-55, /* -0.166666666416265235595 */
22S2 =  0x111110896efbb2.0p-59, /*  0.0083333293858894631756 */
23S3 = -0x1a00f9e2cae774.0p-65, /* -0.000198393348360966317347 */
24S4 =  0x16cd878c3b46a7.0p-71; /*  0.0000027183114939898219064 */
25
26float __sindf(double x)
27{
28	double_t r, s, w, z;
29
30	/* Try to optimize for parallel evaluation as in __tandf.c. */
31	z = x*x;
32	w = z*z;
33	r = S3 + z*S4;
34	s = z*x;
35	return (x + s*(S1 + z*S2)) + s*w*r;
36}