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 __exp2l = exp2l 3125c28e83SPiotr Jasiukajtis 3225c28e83SPiotr Jasiukajtis #include "libm.h" 3325c28e83SPiotr Jasiukajtis #include "longdouble.h" 3425c28e83SPiotr Jasiukajtis 3525c28e83SPiotr Jasiukajtis /* 3625c28e83SPiotr Jasiukajtis * exp2l(x) = 2**x = 2**((x-anint(x))+anint(x)) 3725c28e83SPiotr Jasiukajtis * = 2**anint(x)*2**(x-anint(x)) 3825c28e83SPiotr Jasiukajtis * = 2**anint(x)*exp((x-anint(x))*ln2) 3925c28e83SPiotr Jasiukajtis */ 4025c28e83SPiotr Jasiukajtis 4125c28e83SPiotr Jasiukajtis #define TINY 1.0e-20L /* single: 1e-5, double: 1e-10, quad: 1e-20 */ 4225c28e83SPiotr Jasiukajtis #define OVFLEXP 16400 /* single: 130, double 1030, quad: 16400 */ 4325c28e83SPiotr Jasiukajtis #define UNFLEXP -16520 /* single:-155, double -1080, quad:-16520 */ 4425c28e83SPiotr Jasiukajtis 4525c28e83SPiotr Jasiukajtis static const long double 4625c28e83SPiotr Jasiukajtis zero = 0.0L, 4725c28e83SPiotr Jasiukajtis tiny = TINY * TINY, 4825c28e83SPiotr Jasiukajtis half = 0.5L, 4925c28e83SPiotr Jasiukajtis ln2 = 6.931471805599453094172321214581765680755e-0001L, 5025c28e83SPiotr Jasiukajtis one = 1.0L; 5125c28e83SPiotr Jasiukajtis 5225c28e83SPiotr Jasiukajtis static const int 5325c28e83SPiotr Jasiukajtis ovflexp = OVFLEXP, 5425c28e83SPiotr Jasiukajtis unflexp = UNFLEXP; 5525c28e83SPiotr Jasiukajtis 5625c28e83SPiotr Jasiukajtis long double 5725c28e83SPiotr Jasiukajtis exp2l(long double x) { 5825c28e83SPiotr Jasiukajtis long double t; 5925c28e83SPiotr Jasiukajtis 6025c28e83SPiotr Jasiukajtis if (!finitel(x)) { 6125c28e83SPiotr Jasiukajtis if (isnanl(x) || x > zero) 6225c28e83SPiotr Jasiukajtis return (x + x); 6325c28e83SPiotr Jasiukajtis else 6425c28e83SPiotr Jasiukajtis return (zero); 6525c28e83SPiotr Jasiukajtis } 6625c28e83SPiotr Jasiukajtis t = fabsl(x); 6725c28e83SPiotr Jasiukajtis if (t < half) { 6825c28e83SPiotr Jasiukajtis if (t < tiny) 6925c28e83SPiotr Jasiukajtis return (one + x); 7025c28e83SPiotr Jasiukajtis else 7125c28e83SPiotr Jasiukajtis return (expl(ln2 * x)); 7225c28e83SPiotr Jasiukajtis } 7325c28e83SPiotr Jasiukajtis t = anintl(x); 7425c28e83SPiotr Jasiukajtis if (t < ovflexp) { 7525c28e83SPiotr Jasiukajtis if (t >= unflexp) 7625c28e83SPiotr Jasiukajtis return (scalbnl(expl(ln2 * (x - t)), (int) t)); 7725c28e83SPiotr Jasiukajtis else 7825c28e83SPiotr Jasiukajtis return (scalbnl(one, unflexp)); /* underflow */ 7925c28e83SPiotr Jasiukajtis } else 8025c28e83SPiotr Jasiukajtis return (scalbnl(one, ovflexp)); /* overflow */ 8125c28e83SPiotr Jasiukajtis } 82