/* From: @(#)k_sin.c 1.3 95/01/18 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * Copyright (c) 2008 Steven G. Kargl, David Schultz, Bruce D. Evans. * * Developed at SunSoft, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); /* * ld128 version of k_sin.c. See ../src/k_sin.c for most comments. */ #include "math_private.h" static const double half = 0.5; /* * Domain [-0.7854, 0.7854], range ~[-1.53e-37, 1.659e-37] * |sin(x)/x - s(x)| < 2**-122.1 * * See ../ld80/k_cosl.c for more details about the polynomial. */ static const long double S1 = -0.16666666666666666666666666666666666606732416116558L, S2 = 0.0083333333333333333333333333333331135404851288270047L, S3 = -0.00019841269841269841269841269839935785325638310428717L, S4 = 0.27557319223985890652557316053039946268333231205686e-5L, S5 = -0.25052108385441718775048214826384312253862930064745e-7L, S6 = 0.16059043836821614596571832194524392581082444805729e-9L, S7 = -0.76471637318198151807063387954939213287488216303768e-12L, S8 = 0.28114572543451292625024967174638477283187397621303e-14L; static const double S9 = -0.82206352458348947812512122163446202498005154296863e-17, S10 = 0.19572940011906109418080609928334380560135358385256e-19, S11 = -0.38680813379701966970673724299207480965452616911420e-22, S12 = 0.64038150078671872796678569586315881020659912139412e-25; long double __kernel_sinl(long double x, long double y, int iy) { long double z,r,v; z = x*x; v = z*x; r = S2+z*(S3+z*(S4+z*(S5+z*(S6+z*(S7+z*(S8+ z*(S9+z*(S10+z*(S11+z*S12))))))))); if(iy==0) return x+v*(S1+z*r); else return x-((z*(half*y-v*r)-y)-v*S1); } |