/* $NetBSD: isinfl.c,v 1.5.16.1 2007/05/07 19:49:07 pavel Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp */ #include #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93"; #else __RCSID("$NetBSD: isinfl.c,v 1.5.16.1 2007/05/07 19:49:07 pavel Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include #include #if defined(_MSC_VER) /* Handle Microsoft VC++ compiler specifics. */ // C4700: uninitialized local variable used #pragma warning ( disable : 4700 ) #endif /* * 7.12.3.3 isinf - test for infinity * IEEE 754 compatible 80-bit extended-precision Intel 386 version */ int __isinfl(long double x) { union ieee_ext_u u; u.extu_ld = x; return (u.extu_ext.ext_exp == EXT_EXP_INFNAN && u.extu_ext.ext_frach == 0x80000000 && u.extu_ext.ext_fracl == 0); }