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38 lines
1 KiB
C
38 lines
1 KiB
C
/* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.c */
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/*
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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* Optimized by Bruce D. Evans.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include "libm.h"
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/* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
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static const double
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S1 = -0x1.5555555555555p-3,
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S2 = 0x1.1111111111111p-7,
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S3 = -0x1.a01a01a01a01ap-13,
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S4 = 0x1.71de3a556c734p-19;
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float __sindf(double x)
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{
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double_t r, s, w, z;
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/* Try to optimize for parallel evaluation as in __tandf.c. */
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z = x*x;
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if (x > -7.8175831586122513e-03 && x < 7.8175831586122513e-03)
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return x * (1 + S1 * z);
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w = z*z;
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r = S3 + z*S4;
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s = z*x;
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return (x + s*(S1 + z*S2)) + s*w*r;
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}
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