1*25c28e83SPiotr Jasiukajtis /* 2*25c28e83SPiotr Jasiukajtis * CDDL HEADER START 3*25c28e83SPiotr Jasiukajtis * 4*25c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*25c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*25c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*25c28e83SPiotr Jasiukajtis * 8*25c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*25c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*25c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*25c28e83SPiotr Jasiukajtis * and limitations under the License. 12*25c28e83SPiotr Jasiukajtis * 13*25c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*25c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*25c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*25c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*25c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*25c28e83SPiotr Jasiukajtis * 19*25c28e83SPiotr Jasiukajtis * CDDL HEADER END 20*25c28e83SPiotr Jasiukajtis */ 21*25c28e83SPiotr Jasiukajtis /* 22*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*25c28e83SPiotr Jasiukajtis */ 24*25c28e83SPiotr Jasiukajtis /* 25*25c28e83SPiotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26*25c28e83SPiotr Jasiukajtis * Use is subject to license terms. 27*25c28e83SPiotr Jasiukajtis */ 28*25c28e83SPiotr Jasiukajtis 29*25c28e83SPiotr Jasiukajtis #pragma weak ceil = __ceil 30*25c28e83SPiotr Jasiukajtis 31*25c28e83SPiotr Jasiukajtis /* 32*25c28e83SPiotr Jasiukajtis * ceil(x) returns the least integral value bigger than or equal to x. 33*25c28e83SPiotr Jasiukajtis * NOTE: ceil(x) returns result with the same sign as x's, including 0. 34*25c28e83SPiotr Jasiukajtis * 35*25c28e83SPiotr Jasiukajtis * Modified 8/4/04 for performance. 36*25c28e83SPiotr Jasiukajtis */ 37*25c28e83SPiotr Jasiukajtis 38*25c28e83SPiotr Jasiukajtis #include "libm.h" 39*25c28e83SPiotr Jasiukajtis 40*25c28e83SPiotr Jasiukajtis static const double 41*25c28e83SPiotr Jasiukajtis zero = 0.0, 42*25c28e83SPiotr Jasiukajtis one = 1.0, 43*25c28e83SPiotr Jasiukajtis two52 = 4503599627370496.0; 44*25c28e83SPiotr Jasiukajtis 45*25c28e83SPiotr Jasiukajtis double 46*25c28e83SPiotr Jasiukajtis ceil(double x) { 47*25c28e83SPiotr Jasiukajtis double t, w; 48*25c28e83SPiotr Jasiukajtis int hx, lx, ix; 49*25c28e83SPiotr Jasiukajtis 50*25c28e83SPiotr Jasiukajtis hx = ((int *)&x)[HIWORD]; 51*25c28e83SPiotr Jasiukajtis lx = ((int *)&x)[LOWORD]; 52*25c28e83SPiotr Jasiukajtis ix = hx & ~0x80000000; 53*25c28e83SPiotr Jasiukajtis if (ix >= 0x43300000) /* return x if |x| >= 2^52, or x is NaN */ 54*25c28e83SPiotr Jasiukajtis return (x * one); 55*25c28e83SPiotr Jasiukajtis t = (hx >= 0)? two52 : -two52; 56*25c28e83SPiotr Jasiukajtis w = x + t; 57*25c28e83SPiotr Jasiukajtis t = w - t; 58*25c28e83SPiotr Jasiukajtis if (ix < 0x3ff00000) { 59*25c28e83SPiotr Jasiukajtis if ((ix | lx) == 0) 60*25c28e83SPiotr Jasiukajtis return (x); 61*25c28e83SPiotr Jasiukajtis else 62*25c28e83SPiotr Jasiukajtis return ((hx < 0)? -zero : one); 63*25c28e83SPiotr Jasiukajtis } 64*25c28e83SPiotr Jasiukajtis return ((t >= x)? t : t + one); 65*25c28e83SPiotr Jasiukajtis } 66