1/*- 2 * ==================================================== 3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 4 * 5 * Developed at SunSoft, a Sun Microsystems, Inc. business. 6 * Permission to use, copy, modify, and distribute this 7 * software is freely granted, provided that this notice 8 * is preserved. 9 * ==================================================== 10 * 11 * k_sin.c and k_cos.c merged by Steven G. Kargl. 12 */ 13 14#include <sys/cdefs.h> 15#if 0 16__FBSDID("$FreeBSD: head/lib/msun/src/k_sincos.h 319047 2017-05-28 06:13:38Z mmel $"); 17#endif 18#if defined(LIBM_SCCS) && !defined(lint) 19__RCSID("$NetBSD: k_sincos.h,v 1.2 2022/08/29 01:48:34 riastradh Exp $"); 20#endif 21 22static const double 23S1 = -1.66666666666666324348e-01, /* 0xBFC55555, 0x55555549 */ 24S2 = 8.33333333332248946124e-03, /* 0x3F811111, 0x1110F8A6 */ 25S3 = -1.98412698298579493134e-04, /* 0xBF2A01A0, 0x19C161D5 */ 26S4 = 2.75573137070700676789e-06, /* 0x3EC71DE3, 0x57B1FE7D */ 27S5 = -2.50507602534068634195e-08, /* 0xBE5AE5E6, 0x8A2B9CEB */ 28S6 = 1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */ 29 30static const double 31C1 = 4.16666666666666019037e-02, /* 0x3FA55555, 0x5555554C */ 32C2 = -1.38888888888741095749e-03, /* 0xBF56C16C, 0x16C15177 */ 33C3 = 2.48015872894767294178e-05, /* 0x3EFA01A0, 0x19CB1590 */ 34C4 = -2.75573143513906633035e-07, /* 0xBE927E4F, 0x809C52AD */ 35C5 = 2.08757232129817482790e-09, /* 0x3E21EE9E, 0xBDB4B1C4 */ 36C6 = -1.13596475577881948265e-11; /* 0xBDA8FAE9, 0xBE8838D4 */ 37 38static inline void 39__kernel_sincos(double x, double y, int iy, double *sn, double *cs) 40{ 41 double hz, r, v, w, z; 42 43 z = x * x; 44 w = z * z; 45 r = S2 + z * (S3 + z * S4) + z * w * (S5 + z * S6); 46 v = z * x; 47 48 if (iy == 0) 49 *sn = x + v * (S1 + z * r); 50 else 51 *sn = x - ((z * (y / 2 - v * r) - y) - v * S1); 52 53 r = z * (C1 + z * (C2 + z * C3)) + w * w * (C4 + z * (C5 + z * C6)); 54 hz = z / 2; 55 w = 1 - hz; 56 *cs = w + (((1 - w) - hz) + (z * r - x * y)); 57} 58