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 /* 23*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24*25c28e83SPiotr Jasiukajtis */ 25*25c28e83SPiotr Jasiukajtis /* 26*25c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27*25c28e83SPiotr Jasiukajtis * Use is subject to license terms. 28*25c28e83SPiotr Jasiukajtis */ 29*25c28e83SPiotr Jasiukajtis 30*25c28e83SPiotr Jasiukajtis #pragma weak scalbl = __scalbl 31*25c28e83SPiotr Jasiukajtis 32*25c28e83SPiotr Jasiukajtis /* 33*25c28e83SPiotr Jasiukajtis * scalbl(x,n): return x * 2^n by manipulating exponent. 34*25c28e83SPiotr Jasiukajtis */ 35*25c28e83SPiotr Jasiukajtis 36*25c28e83SPiotr Jasiukajtis #include "libm.h" 37*25c28e83SPiotr Jasiukajtis 38*25c28e83SPiotr Jasiukajtis #define n0 0 39*25c28e83SPiotr Jasiukajtis 40*25c28e83SPiotr Jasiukajtis long double 41*25c28e83SPiotr Jasiukajtis scalbl(long double x, long double fn) { 42*25c28e83SPiotr Jasiukajtis int *py = (int *) &fn, n; 43*25c28e83SPiotr Jasiukajtis long double z; 44*25c28e83SPiotr Jasiukajtis 45*25c28e83SPiotr Jasiukajtis if (isnanl(x) || isnanl(fn)) 46*25c28e83SPiotr Jasiukajtis return (x * fn); 47*25c28e83SPiotr Jasiukajtis 48*25c28e83SPiotr Jasiukajtis /* 49*25c28e83SPiotr Jasiukajtis * fn is inf or NaN 50*25c28e83SPiotr Jasiukajtis */ 51*25c28e83SPiotr Jasiukajtis if ((py[n0] & 0x7fff0000) == 0x7fff0000) { 52*25c28e83SPiotr Jasiukajtis if ((py[n0] & 0x80000000) != 0) 53*25c28e83SPiotr Jasiukajtis return (x / (-fn)); 54*25c28e83SPiotr Jasiukajtis else 55*25c28e83SPiotr Jasiukajtis return (x * fn); 56*25c28e83SPiotr Jasiukajtis } 57*25c28e83SPiotr Jasiukajtis if (rintl(fn) != fn) 58*25c28e83SPiotr Jasiukajtis return ((fn - fn) / (fn - fn)); 59*25c28e83SPiotr Jasiukajtis if (fn > 65000.0L) 60*25c28e83SPiotr Jasiukajtis z = scalbnl(x, 65000); 61*25c28e83SPiotr Jasiukajtis else if (-fn > 65000.0L) 62*25c28e83SPiotr Jasiukajtis z = scalbnl(x, -65000); 63*25c28e83SPiotr Jasiukajtis else { 64*25c28e83SPiotr Jasiukajtis n = (int) fn; 65*25c28e83SPiotr Jasiukajtis z = scalbnl(x, n); 66*25c28e83SPiotr Jasiukajtis } 67*25c28e83SPiotr Jasiukajtis return (z); 68*25c28e83SPiotr Jasiukajtis } 69