125c28e8Piotr Jasiukajtis/*
225c28e8Piotr Jasiukajtis * CDDL HEADER START
325c28e8Piotr Jasiukajtis *
425c28e8Piotr Jasiukajtis * The contents of this file are subject to the terms of the
525c28e8Piotr Jasiukajtis * Common Development and Distribution License (the "License").
625c28e8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
725c28e8Piotr Jasiukajtis *
825c28e8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
925c28e8Piotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
1025c28e8Piotr Jasiukajtis * See the License for the specific language governing permissions
1125c28e8Piotr Jasiukajtis * and limitations under the License.
1225c28e8Piotr Jasiukajtis *
1325c28e8Piotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
1425c28e8Piotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
1525c28e8Piotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
1625c28e8Piotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
1725c28e8Piotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
1825c28e8Piotr Jasiukajtis *
1925c28e8Piotr Jasiukajtis * CDDL HEADER END
2025c28e8Piotr Jasiukajtis */
2125c28e8Piotr Jasiukajtis/*
2225c28e8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
2325c28e8Piotr Jasiukajtis */
2425c28e8Piotr Jasiukajtis/*
2525c28e8Piotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
2625c28e8Piotr Jasiukajtis * Use is subject to license terms.
2725c28e8Piotr Jasiukajtis */
2825c28e8Piotr Jasiukajtis
29ddc0e0bRichard Lowe#pragma weak __ceil = ceil
3025c28e8Piotr Jasiukajtis
3125c28e8Piotr Jasiukajtis/*
3225c28e8Piotr Jasiukajtis * ceil(x) returns the least integral value bigger than or equal to x.
3325c28e8Piotr Jasiukajtis * NOTE: ceil(x) returns result with the same sign as x's, including 0.
3425c28e8Piotr Jasiukajtis *
3525c28e8Piotr Jasiukajtis * Modified 8/4/04 for performance.
3625c28e8Piotr Jasiukajtis */
3725c28e8Piotr Jasiukajtis
3825c28e8Piotr Jasiukajtis#include "libm.h"
3925c28e8Piotr Jasiukajtis
4025c28e8Piotr Jasiukajtisstatic const double
4125c28e8Piotr Jasiukajtis	zero = 0.0,
4225c28e8Piotr Jasiukajtis	one = 1.0,
4325c28e8Piotr Jasiukajtis	two52 = 4503599627370496.0;
4425c28e8Piotr Jasiukajtis
4525c28e8Piotr Jasiukajtisdouble
4625c28e8Piotr Jasiukajtisceil(double x) {
4725c28e8Piotr Jasiukajtis	double	t, w;
4825c28e8Piotr Jasiukajtis	int	hx, lx, ix;
4925c28e8Piotr Jasiukajtis
5025c28e8Piotr Jasiukajtis	hx = ((int *)&x)[HIWORD];
5125c28e8Piotr Jasiukajtis	lx = ((int *)&x)[LOWORD];
5225c28e8Piotr Jasiukajtis	ix = hx & ~0x80000000;
5325c28e8Piotr Jasiukajtis	if (ix >= 0x43300000)	/* return x if |x| >= 2^52, or x is NaN */
5425c28e8Piotr Jasiukajtis		return (x * one);
5525c28e8Piotr Jasiukajtis	t = (hx >= 0)? two52 : -two52;
5625c28e8Piotr Jasiukajtis	w = x + t;
5725c28e8Piotr Jasiukajtis	t = w - t;
5825c28e8Piotr Jasiukajtis	if (ix < 0x3ff00000) {
5925c28e8Piotr Jasiukajtis		if ((ix | lx) == 0)
6025c28e8Piotr Jasiukajtis			return (x);
6125c28e8Piotr Jasiukajtis		else
6225c28e8Piotr Jasiukajtis			return ((hx < 0)? -zero : one);
6325c28e8Piotr Jasiukajtis	}
6425c28e8Piotr Jasiukajtis	return ((t >= x)? t : t + one);
6525c28e8Piotr Jasiukajtis}