Last change
on this file since 373 was 352, checked in by coas-nagasima, 6 years ago |
arm向けASP3版ECNLを追加
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File size:
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Rev | Line | |
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[352] | 1 | /* origin: FreeBSD /usr/src/lib/msun/src/k_cosf.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 | * Debugged and 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 | /* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */
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| 20 | static const double
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| 21 | C0 = -0x1ffffffd0c5e81.0p-54, /* -0.499999997251031003120 */
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| 22 | C1 = 0x155553e1053a42.0p-57, /* 0.0416666233237390631894 */
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| 23 | C2 = -0x16c087e80f1e27.0p-62, /* -0.00138867637746099294692 */
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| 24 | C3 = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */
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| 25 |
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| 26 | float __cosdf(double x)
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| 27 | {
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| 28 | double_t r, 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 = C2+z*C3;
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| 34 | return ((1.0+z*C0) + w*C1) + (w*z)*r;
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| 35 | }
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