1*5b2ba9d3SPiotr Jasiukajtis /* 2*5b2ba9d3SPiotr Jasiukajtis * CDDL HEADER START 3*5b2ba9d3SPiotr Jasiukajtis * 4*5b2ba9d3SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*5b2ba9d3SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*5b2ba9d3SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*5b2ba9d3SPiotr Jasiukajtis * 8*5b2ba9d3SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5b2ba9d3SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*5b2ba9d3SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*5b2ba9d3SPiotr Jasiukajtis * and limitations under the License. 12*5b2ba9d3SPiotr Jasiukajtis * 13*5b2ba9d3SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*5b2ba9d3SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5b2ba9d3SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*5b2ba9d3SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*5b2ba9d3SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*5b2ba9d3SPiotr Jasiukajtis * 19*5b2ba9d3SPiotr Jasiukajtis * CDDL HEADER END 20*5b2ba9d3SPiotr Jasiukajtis */ 21*5b2ba9d3SPiotr Jasiukajtis /* 22*5b2ba9d3SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*5b2ba9d3SPiotr Jasiukajtis */ 24*5b2ba9d3SPiotr Jasiukajtis /* 25*5b2ba9d3SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*5b2ba9d3SPiotr Jasiukajtis * Use is subject to license terms. 27*5b2ba9d3SPiotr Jasiukajtis */ 28*5b2ba9d3SPiotr Jasiukajtis 29*5b2ba9d3SPiotr Jasiukajtis #pragma weak isnan = __isnan 30*5b2ba9d3SPiotr Jasiukajtis #pragma weak _isnan = __isnan 31*5b2ba9d3SPiotr Jasiukajtis #pragma weak _isnand = __isnan 32*5b2ba9d3SPiotr Jasiukajtis #pragma weak isnand = __isnan 33*5b2ba9d3SPiotr Jasiukajtis 34*5b2ba9d3SPiotr Jasiukajtis #include "libm.h" 35*5b2ba9d3SPiotr Jasiukajtis 36*5b2ba9d3SPiotr Jasiukajtis /* 37*5b2ba9d3SPiotr Jasiukajtis * The following implementation assumes fast 64-bit integer arith- 38*5b2ba9d3SPiotr Jasiukajtis * metic. This is fine for sparc because we build libm in v8plus 39*5b2ba9d3SPiotr Jasiukajtis * mode. It's also fine for sparcv9 and amd64. For x86, it would 40*5b2ba9d3SPiotr Jasiukajtis * be better to use 32-bit code, but we have assembly for x86. 41*5b2ba9d3SPiotr Jasiukajtis */ 42*5b2ba9d3SPiotr Jasiukajtis int __isnan(double x)43*5b2ba9d3SPiotr Jasiukajtis__isnan(double x) { 44*5b2ba9d3SPiotr Jasiukajtis long long llx; 45*5b2ba9d3SPiotr Jasiukajtis 46*5b2ba9d3SPiotr Jasiukajtis llx = *(long long *)&x & ~0x8000000000000000ull; 47*5b2ba9d3SPiotr Jasiukajtis return ((unsigned long long)(0x7ff0000000000000ll - llx) >> 63); 48*5b2ba9d3SPiotr Jasiukajtis } 49