k_sinf.c
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/* k_sinf.c -- float version of k_sin.c
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
* Optimized by Bruce D. Evans.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#ifndef INLINE_KERNEL_SINDF
#include "cdefs-compat.h"
//__FBSDID("$FreeBSD: src/lib/msun/src/k_sinf.c,v 1.16 2009/06/03 08:16:34 ed Exp $");
#endif
#include <openlibm_math.h>
#include "math_private.h"
/* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
static const double
S1 = -0x15555554cbac77.0p-55, /* -0.166666666416265235595 */
S2 = 0x111110896efbb2.0p-59, /* 0.0083333293858894631756 */
S3 = -0x1a00f9e2cae774.0p-65, /* -0.000198393348360966317347 */
S4 = 0x16cd878c3b46a7.0p-71; /* 0.0000027183114939898219064 */
#ifndef INLINE_KERNEL_SINDF
extern
#endif
//__inline float
OLM_DLLEXPORT float
__kernel_sindf(double x)
{
double r, s, w, z;
/* Try to optimize for parallel evaluation as in k_tanf.c. */
z = x*x;
w = z*z;
r = S3+z*S4;
s = z*x;
return (x + s*(S1+z*S2)) + s*w*r;
}