125c28e83SPiotr Jasiukajtis /*
225c28e83SPiotr Jasiukajtis * CDDL HEADER START
325c28e83SPiotr Jasiukajtis *
425c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the
525c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License").
625c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License.
725c28e83SPiotr Jasiukajtis *
825c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
925c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
1025c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions
1125c28e83SPiotr Jasiukajtis * and limitations under the License.
1225c28e83SPiotr Jasiukajtis *
1325c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
1425c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
1525c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
1625c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
1725c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
1825c28e83SPiotr Jasiukajtis *
1925c28e83SPiotr Jasiukajtis * CDDL HEADER END
2025c28e83SPiotr Jasiukajtis */
2125c28e83SPiotr Jasiukajtis
2225c28e83SPiotr Jasiukajtis /*
2325c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
2425c28e83SPiotr Jasiukajtis */
2525c28e83SPiotr Jasiukajtis /*
2625c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
2725c28e83SPiotr Jasiukajtis * Use is subject to license terms.
2825c28e83SPiotr Jasiukajtis */
2925c28e83SPiotr Jasiukajtis
3025c28e83SPiotr Jasiukajtis /*
3125c28e83SPiotr Jasiukajtis * __rem_pio2l(x,y)
3225c28e83SPiotr Jasiukajtis *
3325c28e83SPiotr Jasiukajtis * return the remainder of x rem pi/2 in y[0]+y[1] by calling __rem_pio2m
3425c28e83SPiotr Jasiukajtis */
3525c28e83SPiotr Jasiukajtis
3625c28e83SPiotr Jasiukajtis #ifndef FDLIBM_BASED
3725c28e83SPiotr Jasiukajtis #include "libm.h"
3825c28e83SPiotr Jasiukajtis extern int __rem_pio2m(double *, double *, int, int, int, const int *);
3925c28e83SPiotr Jasiukajtis #else /* FDLIBM_BASED */
4025c28e83SPiotr Jasiukajtis #include "fdlibm.h"
4125c28e83SPiotr Jasiukajtis #define __rem_pio2m __kernel_rem_pio2
4225c28e83SPiotr Jasiukajtis #endif /* FDLIBM_BASED */
4325c28e83SPiotr Jasiukajtis
4425c28e83SPiotr Jasiukajtis #include "longdouble.h"
4525c28e83SPiotr Jasiukajtis
4625c28e83SPiotr Jasiukajtis extern const int _TBL_ipio2l_inf[];
4725c28e83SPiotr Jasiukajtis
4825c28e83SPiotr Jasiukajtis static const long double
4925c28e83SPiotr Jasiukajtis two24l = 16777216.0L,
5025c28e83SPiotr Jasiukajtis pio4 = 0.7853981633974483096156608458198757210495L;
5125c28e83SPiotr Jasiukajtis
5225c28e83SPiotr Jasiukajtis int
__rem_pio2l(long double x,long double * y)53*685c1a21SRichard Lowe __rem_pio2l(long double x, long double *y)
54*685c1a21SRichard Lowe {
5525c28e83SPiotr Jasiukajtis long double z, w;
5625c28e83SPiotr Jasiukajtis double t[5], v[5];
5725c28e83SPiotr Jasiukajtis int e0, i, nx, n, sign;
5825c28e83SPiotr Jasiukajtis const int *ipio2;
5925c28e83SPiotr Jasiukajtis
6025c28e83SPiotr Jasiukajtis sign = signbitl(x);
6125c28e83SPiotr Jasiukajtis z = fabsl(x);
6225c28e83SPiotr Jasiukajtis if (z <= pio4) {
6325c28e83SPiotr Jasiukajtis y[0] = x;
6425c28e83SPiotr Jasiukajtis y[1] = 0;
6525c28e83SPiotr Jasiukajtis return (0);
6625c28e83SPiotr Jasiukajtis }
6725c28e83SPiotr Jasiukajtis e0 = ilogbl(z) - 23;
6825c28e83SPiotr Jasiukajtis z = scalbnl(z, -e0);
6925c28e83SPiotr Jasiukajtis for (i = 0; i < 5; i++) {
70*685c1a21SRichard Lowe t[i] = (double)((int)(z));
71*685c1a21SRichard Lowe z = (z - (long double)t[i]) * two24l;
7225c28e83SPiotr Jasiukajtis }
7325c28e83SPiotr Jasiukajtis nx = 5;
7425c28e83SPiotr Jasiukajtis while (t[nx - 1] == 0.0)
7525c28e83SPiotr Jasiukajtis nx--; /* skip zero term */
7625c28e83SPiotr Jasiukajtis ipio2 = _TBL_ipio2l_inf;
77*685c1a21SRichard Lowe n = __rem_pio2m(t, v, e0, nx, 3, (const int *)ipio2);
78*685c1a21SRichard Lowe z = (long double)v[2] + (long double)v[1];
79*685c1a21SRichard Lowe w = (long double)v[0];
8025c28e83SPiotr Jasiukajtis y[0] = z + w;
8125c28e83SPiotr Jasiukajtis y[1] = z - (y[0] - w);
82*685c1a21SRichard Lowe if (sign != 0) {
8325c28e83SPiotr Jasiukajtis y[0] = -y[0];
8425c28e83SPiotr Jasiukajtis y[1] = -y[1];
8525c28e83SPiotr Jasiukajtis return (-n);
8625c28e83SPiotr Jasiukajtis }
8725c28e83SPiotr Jasiukajtis return (n);
8825c28e83SPiotr Jasiukajtis }
89