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 #if defined(ELFOBJ) 31 #pragma weak ldexp = __ldexp 32 #endif 33 34 #include "libm.h" 35 #include <errno.h> 36 37 double 38 ldexp(double x, int n) { 39 int *px = (int *) &x, ix = px[HIWORD] & ~0x80000000; 40 41 if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0) 42 #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN) 43 return (ix >= 0x7ff80000 ? x : x + x); 44 /* assumes sparc-like QNaN */ 45 #else 46 return (x + x); 47 #endif 48 x = scalbn(x, n); 49 ix = px[HIWORD] & ~0x80000000; 50 /* 51 * SVID3 requires both overflow and underflow cases to set errno 52 * XPG3/XPG4/XPG4.2/SUSv2 requires overflow to set errno 53 */ 54 if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0) 55 errno = ERANGE; 56 return (x); 57 } 58