/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2011 Nexenta Systems, Inc. All rights reserved. */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* __rem_pio2l(x,y) * * return the remainder of x rem pi/2 in y[0]+y[1] * by calling __rem_pio2m */ #include "libm.h" #include "longdouble.h" extern const int _TBL_ipio2l_inf[]; static const long double two24l = 16777216.0L, pio4 = 0.7853981633974483096156608458198757210495L; int __rem_pio2l(long double x, long double *y) { long double z, w; double t[3], v[5]; int e0, i, nx, n, sign; sign = signbitl(x); z = fabsl(x); if (z <= pio4) { y[0] = x; y[1] = 0; return (0); } e0 = ilogbl(z) - 23; z = scalbnl(z, -e0); for (i = 0; i < 3; i++) { t[i] = (double)((int)(z)); z = (z - (long double)t[i]) * two24l; } nx = 3; while (t[nx-1] == 0.0) nx--; /* omit trailing zeros */ n = __rem_pio2m(t, v, e0, nx, 2, _TBL_ipio2l_inf); z = (long double)v[1]; w = (long double)v[0]; y[0] = z + w; y[1] = z - (y[0] - w); if (sign == 1) { y[0] = -y[0]; y[1] = -y[1]; return (-n); } return (n); }