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 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 2325c28e83SPiotr Jasiukajtis */ 2425c28e83SPiotr Jasiukajtis /* 2525c28e83SPiotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 2625c28e83SPiotr Jasiukajtis * Use is subject to license terms. 2725c28e83SPiotr Jasiukajtis */ 2825c28e83SPiotr Jasiukajtis 29*ddc0e0b5SRichard Lowe #pragma weak __floor = floor 3025c28e83SPiotr Jasiukajtis 3125c28e83SPiotr Jasiukajtis /* 3225c28e83SPiotr Jasiukajtis * floor(x) returns the biggest integral value less than or equal to x. 3325c28e83SPiotr Jasiukajtis * NOTE: floor(x) returns result with the same sign as x's, including 0. 3425c28e83SPiotr Jasiukajtis * 3525c28e83SPiotr Jasiukajtis * Modified 8/4/04 for performance. 3625c28e83SPiotr Jasiukajtis */ 3725c28e83SPiotr Jasiukajtis 3825c28e83SPiotr Jasiukajtis #include "libm.h" 3925c28e83SPiotr Jasiukajtis 4025c28e83SPiotr Jasiukajtis static const double 4125c28e83SPiotr Jasiukajtis zero = 0.0, 4225c28e83SPiotr Jasiukajtis one = 1.0, 4325c28e83SPiotr Jasiukajtis two52 = 4503599627370496.0; 4425c28e83SPiotr Jasiukajtis 4525c28e83SPiotr Jasiukajtis double 4625c28e83SPiotr Jasiukajtis floor(double x) { 4725c28e83SPiotr Jasiukajtis double t, w; 4825c28e83SPiotr Jasiukajtis int hx, lx, ix; 4925c28e83SPiotr Jasiukajtis 5025c28e83SPiotr Jasiukajtis hx = ((int *)&x)[HIWORD]; 5125c28e83SPiotr Jasiukajtis lx = ((int *)&x)[LOWORD]; 5225c28e83SPiotr Jasiukajtis ix = hx & ~0x80000000; 5325c28e83SPiotr Jasiukajtis if (ix >= 0x43300000) /* return x if |x| >= 2^52, or x is NaN */ 5425c28e83SPiotr Jasiukajtis return (x * one); 5525c28e83SPiotr Jasiukajtis t = (hx >= 0)? two52 : -two52; 5625c28e83SPiotr Jasiukajtis w = x + t; 5725c28e83SPiotr Jasiukajtis t = w - t; 5825c28e83SPiotr Jasiukajtis if (ix < 0x3ff00000) { 5925c28e83SPiotr Jasiukajtis if ((ix | lx) == 0) 6025c28e83SPiotr Jasiukajtis return (x); 6125c28e83SPiotr Jasiukajtis else 6225c28e83SPiotr Jasiukajtis return ((hx < 0)? -one : zero); 6325c28e83SPiotr Jasiukajtis } 6425c28e83SPiotr Jasiukajtis return ((t <= x)? t : t - one); 6525c28e83SPiotr Jasiukajtis } 66