1*25c28e83SPiotr Jasiukajtis /* 2*25c28e83SPiotr Jasiukajtis * CDDL HEADER START 3*25c28e83SPiotr Jasiukajtis * 4*25c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*25c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*25c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*25c28e83SPiotr Jasiukajtis * 8*25c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*25c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*25c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*25c28e83SPiotr Jasiukajtis * and limitations under the License. 12*25c28e83SPiotr Jasiukajtis * 13*25c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*25c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*25c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*25c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*25c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*25c28e83SPiotr Jasiukajtis * 19*25c28e83SPiotr Jasiukajtis * CDDL HEADER END 20*25c28e83SPiotr Jasiukajtis */ 21*25c28e83SPiotr Jasiukajtis /* 22*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*25c28e83SPiotr Jasiukajtis */ 24*25c28e83SPiotr Jasiukajtis /* 25*25c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*25c28e83SPiotr Jasiukajtis * Use is subject to license terms. 27*25c28e83SPiotr Jasiukajtis */ 28*25c28e83SPiotr Jasiukajtis 29*25c28e83SPiotr Jasiukajtis #pragma weak isnan = __isnan 30*25c28e83SPiotr Jasiukajtis #pragma weak _isnan = __isnan 31*25c28e83SPiotr Jasiukajtis #pragma weak _isnand = __isnan 32*25c28e83SPiotr Jasiukajtis #pragma weak isnand = __isnan 33*25c28e83SPiotr Jasiukajtis 34*25c28e83SPiotr Jasiukajtis #include "libm.h" 35*25c28e83SPiotr Jasiukajtis 36*25c28e83SPiotr Jasiukajtis /* 37*25c28e83SPiotr Jasiukajtis * The following implementation assumes fast 64-bit integer arith- 38*25c28e83SPiotr Jasiukajtis * metic. This is fine for sparc because we build libm in v8plus 39*25c28e83SPiotr Jasiukajtis * mode. It's also fine for sparcv9 and amd64. For x86, it would 40*25c28e83SPiotr Jasiukajtis * be better to use 32-bit code, but we have assembly for x86. 41*25c28e83SPiotr Jasiukajtis */ 42*25c28e83SPiotr Jasiukajtis int __isnan(double x)43*25c28e83SPiotr Jasiukajtis__isnan(double x) { 44*25c28e83SPiotr Jasiukajtis long long llx; 45*25c28e83SPiotr Jasiukajtis 46*25c28e83SPiotr Jasiukajtis llx = *(long long *)&x & ~0x8000000000000000ull; 47*25c28e83SPiotr Jasiukajtis return ((unsigned long long)(0x7ff0000000000000ll - llx) >> 63); 48*25c28e83SPiotr Jasiukajtis } 49