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36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
module std::math::nolibc;
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$if (!env::COMPILER_LIBC_AVAILABLE):
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/* origin: FreeBSD /usr/src/lib/msun/src/k_cosf.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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* Debugged and 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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/* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */
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const double C0 @private = -0x1ffffffd0c5e81.0p-54; /* -0.499999997251031003120 */
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const double C1 @private = 0x155553e1053a42.0p-57; /* 0.0416666233237390631894 */
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const double C2 @private = -0x16c087e80f1e27.0p-62; /* -0.00138867637746099294692 */
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const double C3 @private = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */
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fn float __cosdf(double x) @extern("__cosdf") @weak
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{
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/* Try to optimize for parallel evaluation as in __tandf.c. */
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double z = x * x;
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double w = z * z;
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double r = C2 + z * C3;
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return (float)(((1.0f + z * C0) + w * C1) + (w * z) * r);
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}
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$endif; |