diff options
Diffstat (limited to '3rdparty/SDL2/src/libm/k_sin.c')
-rw-r--r-- | 3rdparty/SDL2/src/libm/k_sin.c | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/3rdparty/SDL2/src/libm/k_sin.c b/3rdparty/SDL2/src/libm/k_sin.c deleted file mode 100644 index 60881575a54..00000000000 --- a/3rdparty/SDL2/src/libm/k_sin.c +++ /dev/null @@ -1,87 +0,0 @@ -/* @(#)k_sin.c 5.1 93/09/24 */ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -#if defined(LIBM_SCCS) && !defined(lint) -static const char rcsid[] = - "$NetBSD: k_sin.c,v 1.8 1995/05/10 20:46:31 jtc Exp $"; -#endif - -/* __kernel_sin( x, y, iy) - * kernel sin function on [-pi/4, pi/4], pi/4 ~ 0.7854 - * Input x is assumed to be bounded by ~pi/4 in magnitude. - * Input y is the tail of x. - * Input iy indicates whether y is 0. (if iy=0, y assume to be 0). - * - * Algorithm - * 1. Since sin(-x) = -sin(x), we need only to consider positive x. - * 2. if x < 2^-27 (hx<0x3e400000 0), return x with inexact if x!=0. - * 3. sin(x) is approximated by a polynomial of degree 13 on - * [0,pi/4] - * 3 13 - * sin(x) ~ x + S1*x + ... + S6*x - * where - * - * |sin(x) 2 4 6 8 10 12 | -58 - * |----- - (1+S1*x +S2*x +S3*x +S4*x +S5*x +S6*x )| <= 2 - * | x | - * - * 4. sin(x+y) = sin(x) + sin'(x')*y - * ~ sin(x) + (1-x*x/2)*y - * For better accuracy, let - * 3 2 2 2 2 - * r = x *(S2+x *(S3+x *(S4+x *(S5+x *S6)))) - * then 3 2 - * sin(x) = x + (S1*x + (x *(r-y/2)+y)) - */ - -#include "math_libm.h" -#include "math_private.h" - -#ifdef __STDC__ -static const double -#else -static double -#endif - half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */ - S1 = -1.66666666666666324348e-01, /* 0xBFC55555, 0x55555549 */ - S2 = 8.33333333332248946124e-03, /* 0x3F811111, 0x1110F8A6 */ - S3 = -1.98412698298579493134e-04, /* 0xBF2A01A0, 0x19C161D5 */ - S4 = 2.75573137070700676789e-06, /* 0x3EC71DE3, 0x57B1FE7D */ - S5 = -2.50507602534068634195e-08, /* 0xBE5AE5E6, 0x8A2B9CEB */ - S6 = 1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */ - -#ifdef __STDC__ -double attribute_hidden -__kernel_sin(double x, double y, int iy) -#else -double attribute_hidden -__kernel_sin(x, y, iy) - double x, y; - int iy; /* iy=0 if y is zero */ -#endif -{ - double z, r, v; - int32_t ix; - GET_HIGH_WORD(ix, x); - ix &= 0x7fffffff; /* high word of x */ - if (ix < 0x3e400000) { /* |x| < 2**-27 */ - if ((int) x == 0) - return x; - } /* generate inexact */ - z = x * x; - v = z * x; - r = S2 + z * (S3 + z * (S4 + z * (S5 + z * S6))); - if (iy == 0) - return x + v * (S1 + z * r); - else - return x - ((z * (half * y - v * r) - y) - v * S1); -} |