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 30*ddc0e0b5SRichard Lowe #pragma weak __round = round 3125c28e83SPiotr Jasiukajtis 3225c28e83SPiotr Jasiukajtis #include "libm.h" 3325c28e83SPiotr Jasiukajtis 3425c28e83SPiotr Jasiukajtis double round(double x)3525c28e83SPiotr Jasiukajtisround(double x) { 3625c28e83SPiotr Jasiukajtis union { 3725c28e83SPiotr Jasiukajtis unsigned i[2]; 3825c28e83SPiotr Jasiukajtis double d; 3925c28e83SPiotr Jasiukajtis } xx; 4025c28e83SPiotr Jasiukajtis unsigned hx, sx, i; 4125c28e83SPiotr Jasiukajtis 4225c28e83SPiotr Jasiukajtis xx.d = x; 4325c28e83SPiotr Jasiukajtis hx = xx.i[HIWORD] & ~0x80000000; 4425c28e83SPiotr Jasiukajtis sx = xx.i[HIWORD] & 0x80000000; 4525c28e83SPiotr Jasiukajtis if (hx < 0x43300000) { /* |x| < 2^52 */ 4625c28e83SPiotr Jasiukajtis if (hx < 0x3ff00000) { /* |x| < 1 */ 4725c28e83SPiotr Jasiukajtis if (hx >= 0x3fe00000) 4825c28e83SPiotr Jasiukajtis return (sx ? -1.0 : 1.0); 4925c28e83SPiotr Jasiukajtis return (sx ? -0.0 : 0.0); 5025c28e83SPiotr Jasiukajtis } 5125c28e83SPiotr Jasiukajtis 5225c28e83SPiotr Jasiukajtis /* round x at the integer bit */ 5325c28e83SPiotr Jasiukajtis if (hx < 0x41300000) { 5425c28e83SPiotr Jasiukajtis i = 1 << (0x412 - (hx >> 20)); 5525c28e83SPiotr Jasiukajtis xx.i[HIWORD] = (xx.i[HIWORD] + i) & ~(i | (i - 1)); 5625c28e83SPiotr Jasiukajtis xx.i[LOWORD] = 0; 5725c28e83SPiotr Jasiukajtis } else { 5825c28e83SPiotr Jasiukajtis i = 1 << (0x432 - (hx >> 20)); 5925c28e83SPiotr Jasiukajtis xx.i[LOWORD] += i; 6025c28e83SPiotr Jasiukajtis if (xx.i[LOWORD] < i) 6125c28e83SPiotr Jasiukajtis xx.i[HIWORD]++; 6225c28e83SPiotr Jasiukajtis xx.i[LOWORD] &= ~(i | (i - 1)); 6325c28e83SPiotr Jasiukajtis } 6425c28e83SPiotr Jasiukajtis return (xx.d); 6525c28e83SPiotr Jasiukajtis } else if (hx < 0x7ff00000) 6625c28e83SPiotr Jasiukajtis return (x); 6725c28e83SPiotr Jasiukajtis else 6825c28e83SPiotr Jasiukajtis #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN) 6925c28e83SPiotr Jasiukajtis return (hx >= 0x7ff80000 ? x : x + x); 7025c28e83SPiotr Jasiukajtis /* assumes sparc-like QNaN */ 7125c28e83SPiotr Jasiukajtis #else 7225c28e83SPiotr Jasiukajtis return (x + x); 7325c28e83SPiotr Jasiukajtis #endif 7425c28e83SPiotr Jasiukajtis } 75