1 /* $NetBSD: isnanl_ieee754.c,v 1.1 2003/05/17 14:51:25 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp 40 */ 41 42 #include <sys/cdefs.h> 43 #if defined(LIBC_SCCS) && !defined(lint) 44 #if 0 45 static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93"; 46 #else 47 __RCSID("$NetBSD54_isnan.c,v 1.1 2002/02/19 13:08:13 simonb Exp $"); 48 #endif 49 #endif /* LIBC_SCCS and not lint */ 50 51 #include "namespace.h" 52 #include <sys/types.h> 53 #include <machine/ieee.h> 54 #include <math.h> 55 56 #if !defined(EXT_EXP_INFNAN) 57 #include <assert.h> 58 #endif 59 60 #if 0 /* XXX Currently limited to internal use. */ 61 #ifdef __weak_alias 62 __weak_alias(isnanl,_isnanl) 63 #endif 64 #endif 65 66 int 67 isnanl(long double ld) 68 { 69 #if defined(EXT_EXP_INFNAN) 70 union { 71 long double ld; 72 struct ieee_ext ldbl; 73 } u; 74 75 u.ld = ld; 76 return (u.ldbl.ext_exp == DBL_EXP_INFNAN && 77 (u.ldbl.ext_frach != 0 || u.ldbl.ext_frachm != 0 || 78 u.ldbl.ext_fraclm != 0 || u.ldbl.ext_fracl != 0)); 79 #else 80 _DIAGASSERT(sizeof(double) == sizeof(long double)); 81 return (isnan((double) ld)); 82 #endif /* EXT_EXP_INFNAN */ 83 } 84