1/* $NetBSD: fpclassifyd.c,v 1.2 2004/01/20 19:29:43 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34__RCSID("$NetBSD: fpclassifyd.c,v 1.2 2004/01/20 19:29:43 matt Exp $"); 35#endif 36 37#include <machine/vaxfp.h> 38#include <math.h> 39 40/* 41 * 7.12.3.1 fpclassify - classify real floating type 42 * VAX D_floating version 43 * 44 * Implementation notes: 45 * Reserved operand -> FP_ROP 46 * True zero -> FP_ZERO 47 * Dirty zero -> FP_DIRTY_ZERO 48 * Finite -> FP_NORMAL 49 */ 50int 51__fpclassifyd(double x) 52{ 53 union vax_dfloating_u u; 54 55 u.dfltu_d = x; 56 57 if (u.dfltu_dflt.dflt_exp == 0) { 58 if (u.dfltu_dflt.dflt_sign != 0) 59 return FP_ROP; 60 else if (u.dfltu_dflt.dflt_frach != 0 || 61 u.dfltu_dflt.dflt_fracm != 0 || 62 u.dfltu_dflt.dflt_fracl != 0) 63 return FP_DIRTYZERO; 64 else 65 return FP_ZERO; 66 } else { 67 return FP_NORMAL; 68 } 69} 70