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 __rintl = rintl 3125c28e83SPiotr Jasiukajtis 3225c28e83SPiotr Jasiukajtis /* 3325c28e83SPiotr Jasiukajtis * rintl(long double x) return x rounded to integral according to 3425c28e83SPiotr Jasiukajtis * the prevailing rounding direction 3525c28e83SPiotr Jasiukajtis * 3625c28e83SPiotr Jasiukajtis * NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result 3725c28e83SPiotr Jasiukajtis * with the same sign as x's, including 0.0L. 3825c28e83SPiotr Jasiukajtis */ 3925c28e83SPiotr Jasiukajtis 4025c28e83SPiotr Jasiukajtis #include "libm.h" 4125c28e83SPiotr Jasiukajtis #include "longdouble.h" 4225c28e83SPiotr Jasiukajtis 4325c28e83SPiotr Jasiukajtis extern enum fp_precision_type __swapRP(enum fp_precision_type); 4425c28e83SPiotr Jasiukajtis 4525c28e83SPiotr Jasiukajtis static const double one = 1.0; 4625c28e83SPiotr Jasiukajtis static const long double qzero = 0.0L; 4725c28e83SPiotr Jasiukajtis 4825c28e83SPiotr Jasiukajtis long double 4925c28e83SPiotr Jasiukajtis rintl(long double x) { 5025c28e83SPiotr Jasiukajtis enum fp_precision_type rp; 5125c28e83SPiotr Jasiukajtis long double t, w, two112; 5225c28e83SPiotr Jasiukajtis int *pt = (int *) &two112; 5325c28e83SPiotr Jasiukajtis 5425c28e83SPiotr Jasiukajtis if (!finitel(x)) 5525c28e83SPiotr Jasiukajtis return (x + x); 5625c28e83SPiotr Jasiukajtis 5725c28e83SPiotr Jasiukajtis if (*(int *) &one != 0) { /* set two112 = 2^112 */ 5825c28e83SPiotr Jasiukajtis pt[0] = 0x406f0000; 5925c28e83SPiotr Jasiukajtis pt[1] = pt[2] = pt[3] = 0; 6025c28e83SPiotr Jasiukajtis } else { 6125c28e83SPiotr Jasiukajtis pt[3] = 0x406f0000; 6225c28e83SPiotr Jasiukajtis pt[0] = pt[1] = pt[2] = 0; 6325c28e83SPiotr Jasiukajtis } 6425c28e83SPiotr Jasiukajtis 6525c28e83SPiotr Jasiukajtis if (fabsl(x) >= two112) 6625c28e83SPiotr Jasiukajtis return (x); /* already an integer */ 6725c28e83SPiotr Jasiukajtis t = copysignl(two112, x); 6825c28e83SPiotr Jasiukajtis rp = __swapRP(fp_extended); /* make sure precision is long double */ 6925c28e83SPiotr Jasiukajtis w = x + t; /* x+sign(x)*2^112 rounded to integer */ 7025c28e83SPiotr Jasiukajtis (void) __swapRP(rp); /* restore precision mode */ 7125c28e83SPiotr Jasiukajtis if (w == t) 7225c28e83SPiotr Jasiukajtis return (copysignl(qzero, x)); /* x rounded to zero */ 7325c28e83SPiotr Jasiukajtis else 7425c28e83SPiotr Jasiukajtis return (w - t); 7525c28e83SPiotr Jasiukajtis } 76