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 #include "longdouble.h" 38 39 #include <sys/isa_defs.h> 40 41 long double 42 scalbl(long double x, long double fn) { 43 int *py = (int *) &fn, n; 44 long double z; 45 46 if (isnanl(x) || isnanl(fn)) 47 return x * fn; 48 49 /* fn is +/-Inf */ 50 #if defined(_BIG_ENDIAN) 51 if ((py[0] & 0x7fff0000) == 0x7fff0000) { 52 if ((py[0] & 0x80000000) != 0) 53 #else 54 if ((py[2] & 0x7fff) == 0x7fff) { 55 if ((py[2] & 0x8000) != 0) 56 #endif 57 return x / (-fn); 58 else 59 return x * fn; 60 } 61 if (rintl(fn) != fn) 62 return (fn - fn) / (fn - fn); 63 if (fn > 65000.0L) 64 z = scalbnl(x, 65000); 65 else if (-fn > 65000.0L) 66 z = scalbnl(x, -65000); 67 else { 68 n = (int) fn; 69 z = scalbnl(x, n); 70 } 71 return z; 72 } 73