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32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
module std::math::nolibc @if(env::NO_LIBC);
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/* origin: FreeBSD /usr/src/lib/msun/src/k_sin.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 __sin(double x, double y, int iy) @extern("__sin") @weak @nostrip
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{
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const S1 = -1.66666666666666324348e-01; /* 0xBFC55555, 0x55555549 */
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const S2 = 8.33333333332248946124e-03; /* 0x3F811111, 0x1110F8A6 */
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const S3 = -1.98412698298579493134e-04; /* 0xBF2A01A0, 0x19C161D5 */
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const S4 = 2.75573137070700676789e-06; /* 0x3EC71DE3, 0x57B1FE7D */
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const S5 = -2.50507602534068634195e-08; /* 0xBE5AE5E6, 0x8A2B9CEB */
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const S6 = 1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */
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double z = x * x;
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double w = z * z;
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double r = S2 + z * (S3 + z * S4) + z * w * (S5 + z * S6);
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double v = z * x;
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return iy == 0
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? x + v * (S1 + z * r)
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: x - ((z * (0.5 * y - v * r) - y) - v * S1);
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}
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