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34 lines
1.2 KiB
C
34 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_cos.c */
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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 SunSoft, 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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fn double __cos(double x, double y) @extern("__cos") @weak @nostrip
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{
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const C1 = 4.16666666666666019037e-02; /* 0x3FA55555, 0x5555554C */
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const C2 = -1.38888888888741095749e-03; /* 0xBF56C16C, 0x16C15177 */
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const C3 = 2.48015872894767294178e-05; /* 0x3EFA01A0, 0x19CB1590 */
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const C4 = -2.75573143513906633035e-07; /* 0xBE927E4F, 0x809C52AD */
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const C5 = 2.08757232129817482790e-09; /* 0x3E21EE9E, 0xBDB4B1C4 */
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const C6 = -1.13596475577881948265e-11; /* 0xBDA8FAE9, 0xBE8838D4 */
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double z = x * x;
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double w = z * z;
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double r = z * (C1 + z * (C2 + z * C3)) + w * w * (C4 + z * (C5 + z * C6));
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double hz = 0.5 * z;
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w = 1.0 - hz;
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return w + (((1.0 - w) - hz) + (z * r - x * y));
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}
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$endif |