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 __ldexp = ldexp 31 32 #include "libm.h" 33 #include <errno.h> 34 35 double ldexp(double x,int n)36ldexp(double x, int n) { 37 int *px = (int *) &x, ix = px[HIWORD] & ~0x80000000; 38 39 if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0) 40 #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN) 41 return (ix >= 0x7ff80000 ? x : x + x); 42 /* assumes sparc-like QNaN */ 43 #else 44 return (x + x); 45 #endif 46 x = scalbn(x, n); 47 ix = px[HIWORD] & ~0x80000000; 48 /* 49 * SVID3 requires both overflow and underflow cases to set errno 50 * XPG3/XPG4/XPG4.2/SUSv2 requires overflow to set errno 51 */ 52 if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0) 53 errno = ERANGE; 54 return (x); 55 } 56