Last change
on this file since 351 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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File size:
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1 | /* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.c */
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2 | /*
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3 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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4 | * Optimized by Bruce D. Evans.
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5 | */
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6 | /*
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7 | * ====================================================
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8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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9 | *
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10 | * Developed at SunPro, a Sun Microsystems, Inc. business.
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11 | * Permission to use, copy, modify, and distribute this
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12 | * software is freely granted, provided that this notice
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13 | * is preserved.
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14 | * ====================================================
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15 | */
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16 |
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17 | #include "libm.h"
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18 |
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19 | /* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
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20 | static const double
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21 | S1 = -0x15555554cbac77.0p-55, /* -0.166666666416265235595 */
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22 | S2 = 0x111110896efbb2.0p-59, /* 0.0083333293858894631756 */
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23 | S3 = -0x1a00f9e2cae774.0p-65, /* -0.000198393348360966317347 */
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24 | S4 = 0x16cd878c3b46a7.0p-71; /* 0.0000027183114939898219064 */
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25 |
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26 | float __sindf(double x)
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27 | {
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28 | double_t r, s, w, z;
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29 |
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30 | /* Try to optimize for parallel evaluation as in __tandf.c. */
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31 | z = x*x;
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32 | w = z*z;
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33 | r = S3 + z*S4;
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34 | s = z*x;
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35 | return (x + s*(S1 + z*S2)) + s*w*r;
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36 | }
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