25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER START
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * The contents of this file are subject to the terms of the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Common Development and Distribution License (the "License").
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * See the License for the specific language governing permissions
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * and limitations under the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER END
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Use is subject to license terms.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/* __rem_pio2l(x,y)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * return the remainder of x rem pi/2 in y[0]+y[1]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * by calling __rem_pio2m
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#include "libm.h"
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#include "longdouble.h"
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisextern const int _TBL_ipio2l_inf[];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisstatic const long double
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis two24l = 16777216.0L,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis pio4 = 0.7853981633974483096156608458198757210495L;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisint
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis__rem_pio2l(long double x, long double *y)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis{
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis long double z, w;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis double t[3], v[5];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis int e0, i, nx, n, sign;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis sign = signbitl(x);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis z = fabsl(x);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (z <= pio4) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis y[0] = x;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis y[1] = 0;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (0);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis e0 = ilogbl(z) - 23;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis z = scalbnl(z, -e0);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis for (i = 0; i < 3; i++) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis t[i] = (double)((int)(z));
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis z = (z - (long double)t[i]) * two24l;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis nx = 3;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis while (t[nx-1] == 0.0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis nx--; /* omit trailing zeros */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis n = __rem_pio2m(t, v, e0, nx, 2, _TBL_ipio2l_inf);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis z = (long double)v[1];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis w = (long double)v[0];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis y[0] = z + w;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis y[1] = z - (y[0] - w);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (sign == 1) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis y[0] = -y[0];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis y[1] = -y[1];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (-n);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis }
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (n);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis}