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 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24 /* 25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma weak isnan = __isnan 30 #pragma weak _isnan = __isnan 31 #pragma weak _isnand = __isnan 32 #pragma weak isnand = __isnan 33 34 #include "libm.h" 35 36 /* 37 * The following implementation assumes fast 64-bit integer arith- 38 * metic. This is fine for sparc because we build libm in v8plus 39 * mode. It's also fine for sparcv9 and amd64. For x86, it would 40 * be better to use 32-bit code, but we have assembly for x86. 41 */ 42 int 43 __isnan(double x) { 44 long long llx; 45 46 llx = *(long long *)&x & ~0x8000000000000000ull; 47 return ((unsigned long long)(0x7ff0000000000000ll - llx) >> 63); 48 } 49