1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma weak __scalbl = scalbl 31 32 /* 33 * scalbl(x,n): return x * 2^n by manipulating exponent. 34 */ 35 36 #include "libm.h" 37 38 #define n0 0 39 40 long double 41 scalbl(long double x, long double fn) { 42 int *py = (int *) &fn, n; 43 long double z; 44 45 if (isnanl(x) || isnanl(fn)) 46 return (x * fn); 47 48 /* 49 * fn is inf or NaN 50 */ 51 if ((py[n0] & 0x7fff0000) == 0x7fff0000) { 52 if ((py[n0] & 0x80000000) != 0) 53 return (x / (-fn)); 54 else 55 return (x * fn); 56 } 57 if (rintl(fn) != fn) 58 return ((fn - fn) / (fn - fn)); 59 if (fn > 65000.0L) 60 z = scalbnl(x, 65000); 61 else if (-fn > 65000.0L) 62 z = scalbnl(x, -65000); 63 else { 64 n = (int) fn; 65 z = scalbnl(x, n); 66 } 67 return (z); 68 } 69